Merge branch 'develop'

Fixed animation stopping issue after view controller disappears

.codebeatsettings

@@ -0,0 +1,6 @@
+{
+  "SWIFT": {
+    "TOO_MANY_FUNCTIONS": [50, 100, 150, 200],
+    "TOTAL_LOC": [200, 400, 500, 600]
+  }
+}

.github/stale.yml

@@ -0,0 +1,15 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 60
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - work in progress
+staleLabel: given up
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false

CHANGELOG.md

@@ -3,8 +3,22 @@ All notable changes to this project will be documented in this file
 
 ## Next version
 
+### Improvements
+- Fix completion call in .none transition style while hide skeletons. (thanks @aadudyrev)
+
+## [Transitions (1.8)](https://github.com/Juanpe/SkeletonView/releases/tag/1.8)
+
 ### New
+
 - Adding swift news to mentioned section (thanks @osterbergmarcus).
+- Create `SkeletonTransitionStyle`. Now, you can animate transition when you show or hide skeletons. (thanks @pontusjacobsson)
+
+### Improvements
+- Refactor some methods.
+
+### Bug fixes
+- Solved issues.
+ [#175](https://github.com/Juanpe/SkeletonView/issues/175) Swift Package Manager version format
 
 ## [Layout update (1.7)](https://github.com/Juanpe/SkeletonView/releases/tag/1.7)
 

Example/CollectionView/AppDelegate.swift

@@ -8,7 +8,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
     var window: UIWindow?
 
 
-    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         // Override point for customization after application launch.
         return true
     }

Example/CollectionView/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Example/CollectionView/Assets.xcassets/avatar.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "avatar.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Example/CollectionView/Assets.xcassets/picture.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "picture.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Example/CollectionView/CollectionViewCell.swift

@@ -6,12 +6,14 @@ import SkeletonView
 class CollectionViewCell: UICollectionViewCell {
     
     var label: UILabel!
+    var imageView: UIImageView!
     
     override init(frame: CGRect) {
         super.init(frame: frame)
         
         isSkeletonable = true
         createLabel()
+        createImageView()
         
     }
     
@@ -19,16 +21,34 @@ class CollectionViewCell: UICollectionViewCell {
         fatalError("init(coder:) has not been implemented")
     }
     
+    private func createImageView() {
+        imageView = UIImageView(image: UIImage(named: "picture"))
+        imageView.isSkeletonable = true
+        imageView.translatesAutoresizingMaskIntoConstraints = false
+        imageView.contentMode = .scaleAspectFit
+        addSubview(imageView)
+        NSLayoutConstraint.activate([
+            imageView.centerXAnchor.constraint(equalTo: centerXAnchor),
+            imageView.topAnchor.constraint(equalTo: topAnchor),
+            imageView.heightAnchor.constraint(equalTo: heightAnchor, multiplier: 0.75),
+            imageView.widthAnchor.constraint(equalTo: widthAnchor, multiplier: 0.75)
+            ])
+        
+        
+    }
+    
     private func createLabel() {
         label = UILabel()
         label.isSkeletonable = true
+        label.text = "Lorem ipsum"
+        label.textAlignment = .center
         label.translatesAutoresizingMaskIntoConstraints = false
         addSubview(label)
         NSLayoutConstraint.activate([
             label.centerXAnchor.constraint(equalTo: centerXAnchor),
-            label.centerYAnchor.constraint(equalTo: centerYAnchor),
-            label.heightAnchor.constraint(equalToConstant: frame.height / 2),
-            label.widthAnchor.constraint(equalToConstant: frame.width / 2)
+            label.bottomAnchor.constraint(equalTo: bottomAnchor),
+            label.heightAnchor.constraint(equalToConstant: 40),
+            label.widthAnchor.constraint(equalToConstant: frame.width)
             ])
     }
     

Example/CollectionView/Main.storyboard

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14113" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="irH-dz-xqL">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="irH-dz-xqL">
     <device id="retina4_7" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
@@ -13,7 +13,7 @@
         <!--View Controller-->
         <scene sceneID="qda-qV-vJk">
             <objects>
-                <viewController id="irH-dz-xqL" customClass="ViewController" customModule="SkeletonViewExampleUICollectionView" customModuleProvider="target" sceneMemberID="viewController">
+                <viewController id="irH-dz-xqL" customClass="ViewController" customModule="SkeletonViewExampleUICollectionView" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="Fso-nq-n6t">
                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
@@ -37,7 +37,7 @@
                                             </userDefinedRuntimeAttribute>
                                         </userDefinedRuntimeAttributes>
                                     </textView>
-                                    <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="avatar" translatesAutoresizingMaskIntoConstraints="NO" id="Ql9-Jy-aWM">
+                                    <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="avatar" translatesAutoresizingMaskIntoConstraints="NO" id="Ql9-Jy-aWM">
                                         <rect key="frame" x="141" y="20" width="93" height="93"/>
                                         <color key="backgroundColor" red="0.56078431370000004" green="0.59607843140000005" blue="0.7843137255" alpha="0.90709546230000004" colorSpace="calibratedRGB"/>
                                         <constraints>
@@ -66,7 +66,7 @@
                                 </userDefinedRuntimeAttributes>
                             </view>
                             <collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" translatesAutoresizingMaskIntoConstraints="NO" id="HKL-L0-T2w">
-                                <rect key="frame" x="0.0" y="263" width="375" height="264"/>
+                                <rect key="frame" x="0.0" y="263" width="375" height="244"/>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="10" minimumInteritemSpacing="10" id="mGU-kn-rfE">
                                     <size key="itemSize" width="50" height="50"/>
@@ -80,11 +80,10 @@
                                 </connections>
                             </collectionView>
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="JjA-MK-YzZ">
-                                <rect key="frame" x="0.0" y="527" width="375" height="140"/>
+                                <rect key="frame" x="0.0" y="507" width="375" height="160"/>
                                 <subviews>
-                                    <segmentedControl opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="fMR-vj-7de">
-                                        <rect key="frame" x="20" y="23" width="140" height="29"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="fMR-vj-7de">
+                                        <rect key="frame" x="20" y="22.5" width="135" height="29"/>
                                         <segments>
                                             <segment title="Solid"/>
                                             <segment title="Gradient"/>
@@ -93,44 +92,85 @@
                                             <action selector="changeSkeletonType:" destination="irH-dz-xqL" eventType="valueChanged" id="lfR-JV-DU4"/>
                                         </connections>
                                     </segmentedControl>
-                                    <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="KBe-RM-BG8">
-                                        <rect key="frame" x="310" y="21" width="49" height="31"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="KBe-RM-BG8">
+                                        <rect key="frame" x="308" y="21" width="51" height="31"/>
                                         <connections>
                                             <action selector="changeAnimated:" destination="irH-dz-xqL" eventType="valueChanged" id="dlH-KK-iee"/>
                                         </connections>
                                     </switch>
-                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Animated" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="GSj-Ze-UIK">
-                                        <rect key="frame" x="211" y="28" width="91" height="21"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Animated" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="GSj-Ze-UIK">
+                                        <rect key="frame" x="229" y="26" width="73" height="21"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                         <nil key="textColor"/>
                                         <nil key="highlightedColor"/>
                                     </label>
-                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Color" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="4Hm-fj-45V">
-                                        <rect key="frame" x="32" y="89" width="52" height="21"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Color" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="4Hm-fj-45V">
+                                        <rect key="frame" x="20" y="61" width="41.5" height="52"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                         <nil key="textColor"/>
                                         <nil key="highlightedColor"/>
                                     </label>
-                                    <view contentMode="scaleToFill" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="HBJ-nh-56V">
-                                        <rect key="frame" x="92" y="84" width="30" height="30"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="HBJ-nh-56V">
+                                        <rect key="frame" x="69.5" y="72" width="30" height="30"/>
                                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                        <constraints>
+                                            <constraint firstAttribute="width" constant="30" id="DVW-Tc-XEQ"/>
+                                            <constraint firstAttribute="height" constant="30" id="JfP-3b-yqX"/>
+                                        </constraints>
                                     </view>
-                                    <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="aUR-Qo-gHK">
-                                        <rect key="frame" x="20" y="74" width="140" height="52"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="aUR-Qo-gHK">
+                                        <rect key="frame" x="20" y="61" width="100" height="52"/>
+                                        <constraints>
+                                            <constraint firstAttribute="width" constant="100" id="GvX-hq-2Qn"/>
+                                            <constraint firstAttribute="height" constant="52" id="UQe-Cf-riE"/>
+                                        </constraints>
                                         <connections>
                                             <action selector="btnChangeColorTouchUpInside:" destination="irH-dz-xqL" eventType="touchUpInside" id="Xca-QC-htl"/>
                                         </connections>
                                     </button>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="nPs-17-vfs">
+                                        <rect key="frame" x="263" y="72" width="94" height="30"/>
+                                        <state key="normal" title="Hide skeleton"/>
+                                        <connections>
+                                            <action selector="showOrHideSkeleton:" destination="irH-dz-xqL" eventType="touchUpInside" id="lHc-k2-OgV"/>
+                                        </connections>
+                                    </button>
+                                    <stepper opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" maximumValue="5" stepValue="0.25" translatesAutoresizingMaskIntoConstraints="NO" id="3mz-9M-e7Q">
+                                        <rect key="frame" x="263" y="126" width="94" height="29"/>
+                                        <connections>
+                                            <action selector="transitionDurationStepperAction:" destination="irH-dz-xqL" eventType="valueChanged" id="Ll0-Pr-d0V"/>
+                                        </connections>
+                                    </stepper>
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Fade Duration: 0 sec" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="5gN-Jz-44y">
+                                        <rect key="frame" x="113.5" y="131.5" width="141.5" height="18"/>
+                                        <fontDescription key="fontDescription" type="system" pointSize="15"/>
+                                        <nil key="textColor"/>
+                                        <nil key="highlightedColor"/>
+                                    </label>
                                 </subviews>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <constraints>
-                                    <constraint firstAttribute="height" constant="140" id="QDV-wu-e3I"/>
-                                    <constraint firstAttribute="height" relation="greaterThanOrEqual" constant="140" id="qR5-cz-YAm"/>
+                                    <constraint firstItem="3mz-9M-e7Q" firstAttribute="leading" secondItem="5gN-Jz-44y" secondAttribute="trailing" constant="8" id="65e-Nj-bKG"/>
+                                    <constraint firstItem="HBJ-nh-56V" firstAttribute="centerY" secondItem="aUR-Qo-gHK" secondAttribute="centerY" id="81M-Wq-Avl"/>
+                                    <constraint firstItem="fMR-vj-7de" firstAttribute="leading" secondItem="JjA-MK-YzZ" secondAttribute="leading" constant="20" id="AyG-hI-tte"/>
+                                    <constraint firstItem="aUR-Qo-gHK" firstAttribute="leading" secondItem="fMR-vj-7de" secondAttribute="leading" id="C1b-Hl-jEg"/>
+                                    <constraint firstItem="3mz-9M-e7Q" firstAttribute="trailing" secondItem="nPs-17-vfs" secondAttribute="trailing" id="KuK-fc-jOQ"/>
+                                    <constraint firstItem="nPs-17-vfs" firstAttribute="centerY" secondItem="aUR-Qo-gHK" secondAttribute="centerY" id="MQX-E5-IDE"/>
+                                    <constraint firstItem="HBJ-nh-56V" firstAttribute="leading" secondItem="4Hm-fj-45V" secondAttribute="trailing" constant="8" id="MhM-jY-LIA"/>
+                                    <constraint firstItem="4Hm-fj-45V" firstAttribute="height" secondItem="aUR-Qo-gHK" secondAttribute="height" id="OSn-RA-wQL"/>
+                                    <constraint firstItem="4Hm-fj-45V" firstAttribute="leading" secondItem="aUR-Qo-gHK" secondAttribute="leading" id="PwQ-UR-iMq"/>
+                                    <constraint firstAttribute="height" constant="160" id="QDV-wu-e3I"/>
+                                    <constraint firstItem="5gN-Jz-44y" firstAttribute="centerY" secondItem="3mz-9M-e7Q" secondAttribute="centerY" id="TGP-Ep-0ob"/>
+                                    <constraint firstItem="nPs-17-vfs" firstAttribute="top" secondItem="KBe-RM-BG8" secondAttribute="bottom" constant="20" id="TPg-wY-9bc"/>
+                                    <constraint firstItem="4Hm-fj-45V" firstAttribute="centerY" secondItem="aUR-Qo-gHK" secondAttribute="centerY" id="V4i-bF-Jed"/>
+                                    <constraint firstItem="KBe-RM-BG8" firstAttribute="leading" secondItem="GSj-Ze-UIK" secondAttribute="trailing" constant="6" id="ehg-tW-7kq"/>
+                                    <constraint firstItem="GSj-Ze-UIK" firstAttribute="centerY" secondItem="KBe-RM-BG8" secondAttribute="centerY" id="esk-GV-DBS"/>
+                                    <constraint firstAttribute="trailing" secondItem="KBe-RM-BG8" secondAttribute="trailing" constant="18" id="hhE-rV-dV7"/>
+                                    <constraint firstItem="KBe-RM-BG8" firstAttribute="top" secondItem="JjA-MK-YzZ" secondAttribute="top" constant="21" id="pBQ-H8-xTK"/>
+                                    <constraint firstAttribute="bottom" secondItem="3mz-9M-e7Q" secondAttribute="bottom" constant="5" id="pQ9-a6-hM4"/>
+                                    <constraint firstItem="fMR-vj-7de" firstAttribute="centerY" secondItem="GSj-Ze-UIK" secondAttribute="centerY" id="q2v-t1-Zu0"/>
+                                    <constraint firstAttribute="height" relation="greaterThanOrEqual" constant="160" id="qR5-cz-YAm"/>
+                                    <constraint firstItem="nPs-17-vfs" firstAttribute="trailing" secondItem="KBe-RM-BG8" secondAttribute="trailing" id="yls-k6-ZfC"/>
                                 </constraints>
                             </view>
                         </subviews>
@@ -153,8 +193,11 @@
                         <outlet property="avatarImage" destination="Ql9-Jy-aWM" id="VoL-by-ygR"/>
                         <outlet property="collectionView" destination="HKL-L0-T2w" id="HSe-j0-S5d"/>
                         <outlet property="colorSelectedView" destination="HBJ-nh-56V" id="Iiq-iY-Glj"/>
+                        <outlet property="showOrHideSkeletonButton" destination="nPs-17-vfs" id="vw4-fW-QoD"/>
                         <outlet property="skeletonTypeSelector" destination="fMR-vj-7de" id="CgX-3A-weo"/>
                         <outlet property="switchAnimated" destination="KBe-RM-BG8" id="emU-g9-NHT"/>
+                        <outlet property="transitionDurationLabel" destination="5gN-Jz-44y" id="69y-iR-mbi"/>
+                        <outlet property="transitionDurationStepper" destination="3mz-9M-e7Q" id="tzK-W7-A4D"/>
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="PkM-Y0-M5i" userLabel="First Responder" sceneMemberID="firstResponder"/>

Example/CollectionView/ViewController.swift

@@ -4,7 +4,6 @@ import UIKit
 import SkeletonView
 
 class ViewController: UIViewController {
-    
     @IBOutlet weak var collectionView: UICollectionView! {
         didSet {
             collectionView.isSkeletonable = true
@@ -36,6 +35,9 @@ class ViewController: UIViewController {
     
     @IBOutlet weak var switchAnimated: UISwitch!
     @IBOutlet weak var skeletonTypeSelector: UISegmentedControl!
+    @IBOutlet weak var showOrHideSkeletonButton: UIButton!
+    @IBOutlet weak var transitionDurationLabel: UILabel!
+    @IBOutlet weak var transitionDurationStepper: UIStepper!
     
     var type: SkeletonType {
         return skeletonTypeSelector.selectedSegmentIndex == 0 ? .solid : .gradient
@@ -65,6 +67,23 @@ class ViewController: UIViewController {
         showAlertPicker()
     }
     
+    @IBAction func showOrHideSkeleton(_ sender: Any) {
+        showOrHideSkeletonButton.setTitle((view.isSkeletonActive ? "Show skeleton" : "Hide skeleton"), for: .normal)
+        view.isSkeletonActive ? hideSkeleton() : showSkeleton()
+    }
+    
+    @IBAction func transitionDurationStepperAction(_ sender: Any) {
+        transitionDurationLabel.text = "transition duration: \(transitionDurationStepper.value) sec"
+    }
+    
+    func showSkeleton() {
+        refreshSkeleton()
+    }
+    
+    func hideSkeleton() {
+        view.hideSkeleton(transition: .crossDissolve(transitionDurationStepper.value))
+    }
+    
     func refreshSkeleton() {
         self.view.hideSkeleton()
         if type == .gradient { showGradientSkeleton() }
@@ -73,23 +92,22 @@ class ViewController: UIViewController {
     
     func showSolidSkeleton() {
         if switchAnimated.isOn {
-            view.showAnimatedSkeleton(usingColor: colorSelectedView.backgroundColor!)
+            view.showAnimatedSkeleton(usingColor: colorSelectedView.backgroundColor!, transition: .crossDissolve(transitionDurationStepper.value))
         } else {
-            view.showSkeleton(usingColor: colorSelectedView.backgroundColor!)
+            view.showSkeleton(usingColor: colorSelectedView.backgroundColor!, transition: .crossDissolve(transitionDurationStepper.value))
         }
     }
     
     func showGradientSkeleton() {
         let gradient = SkeletonGradient(baseColor: colorSelectedView.backgroundColor!)
         if switchAnimated.isOn {
-            view.showAnimatedGradientSkeleton(usingGradient: gradient)
+            view.showAnimatedGradientSkeleton(usingGradient: gradient, transition: .crossDissolve(transitionDurationStepper.value))
         } else {
-            view.showGradientSkeleton(usingGradient: gradient)
+            view.showGradientSkeleton(usingGradient: gradient, transition: .crossDissolve(transitionDurationStepper.value))
         }
     }
     
     func showAlertPicker() {
-        
         let alertView = UIAlertController(title: "Select color", message: "\n\n\n\n\n\n", preferredStyle: .alert)
         
         let pickerView = UIPickerView(frame: CGRect(x: 0, y: 50, width: 260, height: 115))
@@ -117,7 +135,6 @@ class ViewController: UIViewController {
  // MARK: - UIPickerViewDelegate, UIPickerViewDataSource
 
  extension ViewController: UIPickerViewDelegate, UIPickerViewDataSource {
-    
     func numberOfComponents(in pickerView: UIPickerView) -> Int {
         return 1
     }
@@ -134,7 +151,6 @@ class ViewController: UIViewController {
 // MARK: - UICollectionViewDelegateFlowLayout
 
 extension ViewController: UICollectionViewDelegateFlowLayout {
-    
     func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
         return CGSize(width: view.frame.width/3 - 10, height: view.frame.width/3 - 10)
     }
@@ -162,7 +178,7 @@ extension ViewController: SkeletonCollectionViewDataSource {
     // MARK: - UICollectionViewDataSource
     
     func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
-        return 0
+        return 10
     }
     
     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

Example/TableView/Base.lproj/Main.storyboard

@@ -1,17 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14113" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
-    <device id="retina4_7" orientation="portrait">
-        <adaptation id="fullscreen"/>
-    </device>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14868" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="Va7-1y-Tel">
+    <device id="retina4_7" orientation="portrait" appearance="light"/>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
-        <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14824"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
-        <!--View Controller-->
+        <!--Item-->
         <scene sceneID="tne-QT-ifu">
             <objects>
                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="SkeletonViewExample" customModuleProvider="target" sceneMemberID="viewController">
@@ -19,8 +16,56 @@
                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
+                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="F9K-jU-100" userLabel="ContainerView">
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="243"/>
+                                <subviews>
+                                    <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" textAlignment="natural" translatesAutoresizingMaskIntoConstraints="NO" id="e9V-mk-xH0">
+                                        <rect key="frame" x="45" y="142" width="287" height="78"/>
+                                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                        <constraints>
+                                            <constraint firstAttribute="height" constant="78" id="gF5-G1-lKI"/>
+                                        </constraints>
+                                        <string key="text">Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </string>
+                                        <fontDescription key="fontDescription" type="system" pointSize="14"/>
+                                        <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
+                                        <userDefinedRuntimeAttributes>
+                                            <userDefinedRuntimeAttribute type="boolean" keyPath="isSkeletonable" value="YES"/>
+                                            <userDefinedRuntimeAttribute type="number" keyPath="lastLineFillPercent">
+                                                <integer key="value" value="40"/>
+                                            </userDefinedRuntimeAttribute>
+                                            <userDefinedRuntimeAttribute type="number" keyPath="linesCornerRadius">
+                                                <integer key="value" value="6"/>
+                                            </userDefinedRuntimeAttribute>
+                                        </userDefinedRuntimeAttributes>
+                                    </textView>
+                                    <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="avatar" translatesAutoresizingMaskIntoConstraints="NO" id="nMj-pU-5wJ">
+                                        <rect key="frame" x="141" y="20" width="93" height="93"/>
+                                        <color key="backgroundColor" red="0.56078431370000004" green="0.59607843140000005" blue="0.7843137255" alpha="0.90709546230000004" colorSpace="calibratedRGB"/>
+                                        <constraints>
+                                            <constraint firstAttribute="height" constant="93" id="gw9-nu-cKo"/>
+                                            <constraint firstAttribute="width" constant="93" id="zB6-Lp-IUt"/>
+                                        </constraints>
+                                        <userDefinedRuntimeAttributes>
+                                            <userDefinedRuntimeAttribute type="boolean" keyPath="isSkeletonable" value="YES"/>
+                                        </userDefinedRuntimeAttributes>
+                                    </imageView>
+                                </subviews>
+                                <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                <constraints>
+                                    <constraint firstItem="nMj-pU-5wJ" firstAttribute="centerX" secondItem="F9K-jU-100" secondAttribute="centerX" id="9X4-2r-AKx"/>
+                                    <constraint firstItem="e9V-mk-xH0" firstAttribute="leading" secondItem="F9K-jU-100" secondAttribute="leading" constant="45" id="HvQ-HY-zYU"/>
+                                    <constraint firstItem="e9V-mk-xH0" firstAttribute="centerX" secondItem="F9K-jU-100" secondAttribute="centerX" constant="1" id="KcB-tG-NXa"/>
+                                    <constraint firstAttribute="height" constant="243" id="MIj-xq-gr1"/>
+                                    <constraint firstItem="e9V-mk-xH0" firstAttribute="top" secondItem="F9K-jU-100" secondAttribute="top" constant="142" id="Wcx-nZ-1lR"/>
+                                    <constraint firstAttribute="trailing" secondItem="e9V-mk-xH0" secondAttribute="trailing" constant="43" id="XbU-Og-rht"/>
+                                    <constraint firstItem="nMj-pU-5wJ" firstAttribute="top" secondItem="F9K-jU-100" secondAttribute="top" constant="20" id="hQL-cr-MaN"/>
+                                </constraints>
+                                <userDefinedRuntimeAttributes>
+                                    <userDefinedRuntimeAttribute type="boolean" keyPath="isSkeletonable" value="YES"/>
+                                </userDefinedRuntimeAttributes>
+                            </view>
                             <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="none" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="UCB-SP-lQk">
-                                <rect key="frame" x="0.0" y="263" width="375" height="264"/>
+                                <rect key="frame" x="0.0" y="243" width="375" height="215"/>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <color key="separatorColor" red="0.1061807256" green="0.84678786989999999" blue="0.031482450150000001" alpha="1" colorSpace="custom" customColorSpace="displayP3"/>
                                 <prototypes>
@@ -42,7 +87,7 @@
                                                         <userDefinedRuntimeAttribute type="boolean" keyPath="isSkeletonable" value="YES"/>
                                                     </userDefinedRuntimeAttributes>
                                                 </imageView>
-                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" numberOfLines="15" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="VhU-1t-AaI">
+                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="VhU-1t-AaI" userLabel="Label">
                                                     <rect key="frame" x="118" y="29" width="237" height="20.5"/>
                                                     <constraints>
                                                         <constraint firstAttribute="height" relation="lessThanOrEqual" constant="71" id="HRL-cI-ieC"/>
@@ -53,7 +98,10 @@
                                                     <userDefinedRuntimeAttributes>
                                                         <userDefinedRuntimeAttribute type="boolean" keyPath="isSkeletonable" value="YES"/>
                                                         <userDefinedRuntimeAttribute type="number" keyPath="linesCornerRadius">
-                                                            <integer key="value" value="0"/>
+                                                            <integer key="value" value="5"/>
+                                                        </userDefinedRuntimeAttribute>
+                                                        <userDefinedRuntimeAttribute type="number" keyPath="lastLineFillPercent">
+                                                            <integer key="value" value="20"/>
                                                         </userDefinedRuntimeAttribute>
                                                     </userDefinedRuntimeAttributes>
                                                 </label>
@@ -85,60 +133,11 @@
                                     <outlet property="dataSource" destination="BYZ-38-t0r" id="Hxi-nC-gbY"/>
                                 </connections>
                             </tableView>
-                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="F9K-jU-100">
-                                <rect key="frame" x="0.0" y="20" width="375" height="243"/>
-                                <subviews>
-                                    <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" textAlignment="natural" translatesAutoresizingMaskIntoConstraints="NO" id="e9V-mk-xH0">
-                                        <rect key="frame" x="45" y="142" width="287" height="78"/>
-                                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
-                                        <constraints>
-                                            <constraint firstAttribute="height" constant="78" id="gF5-G1-lKI"/>
-                                        </constraints>
-                                        <string key="text">Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </string>
-                                        <fontDescription key="fontDescription" type="system" pointSize="14"/>
-                                        <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
-                                        <userDefinedRuntimeAttributes>
-                                            <userDefinedRuntimeAttribute type="boolean" keyPath="isSkeletonable" value="YES"/>
-                                            <userDefinedRuntimeAttribute type="number" keyPath="lastLineFillPercent">
-                                                <integer key="value" value="40"/>
-                                            </userDefinedRuntimeAttribute>
-                                            <userDefinedRuntimeAttribute type="number" keyPath="linesCornerRadius">
-                                                <integer key="value" value="6"/>
-                                            </userDefinedRuntimeAttribute>
-                                        </userDefinedRuntimeAttributes>
-                                    </textView>
-                                    <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="avatar" translatesAutoresizingMaskIntoConstraints="NO" id="nMj-pU-5wJ">
-                                        <rect key="frame" x="141" y="20" width="93" height="93"/>
-                                        <color key="backgroundColor" red="0.56078431370000004" green="0.59607843140000005" blue="0.7843137255" alpha="0.90709546230000004" colorSpace="calibratedRGB"/>
-                                        <constraints>
-                                            <constraint firstAttribute="height" constant="93" id="gw9-nu-cKo"/>
-                                            <constraint firstAttribute="width" constant="93" id="zB6-Lp-IUt"/>
-                                        </constraints>
-                                        <userDefinedRuntimeAttributes>
-                                            <userDefinedRuntimeAttribute type="boolean" keyPath="isSkeletonable" value="YES"/>
-                                        </userDefinedRuntimeAttributes>
-                                    </imageView>
-                                </subviews>
-                                <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
-                                <constraints>
-                                    <constraint firstItem="nMj-pU-5wJ" firstAttribute="centerX" secondItem="F9K-jU-100" secondAttribute="centerX" id="9X4-2r-AKx"/>
-                                    <constraint firstItem="e9V-mk-xH0" firstAttribute="leading" secondItem="F9K-jU-100" secondAttribute="leading" constant="45" id="HvQ-HY-zYU"/>
-                                    <constraint firstItem="e9V-mk-xH0" firstAttribute="centerX" secondItem="F9K-jU-100" secondAttribute="centerX" constant="1" id="KcB-tG-NXa"/>
-                                    <constraint firstAttribute="height" constant="243" id="MIj-xq-gr1"/>
-                                    <constraint firstItem="e9V-mk-xH0" firstAttribute="top" secondItem="F9K-jU-100" secondAttribute="top" constant="142" id="Wcx-nZ-1lR"/>
-                                    <constraint firstAttribute="trailing" secondItem="e9V-mk-xH0" secondAttribute="trailing" constant="43" id="XbU-Og-rht"/>
-                                    <constraint firstItem="nMj-pU-5wJ" firstAttribute="top" secondItem="F9K-jU-100" secondAttribute="top" constant="20" id="hQL-cr-MaN"/>
-                                </constraints>
-                                <userDefinedRuntimeAttributes>
-                                    <userDefinedRuntimeAttribute type="boolean" keyPath="isSkeletonable" value="YES"/>
-                                </userDefinedRuntimeAttributes>
-                            </view>
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="XgY-1a-UGc">
-                                <rect key="frame" x="0.0" y="527" width="375" height="140"/>
+                                <rect key="frame" x="0.0" y="458" width="375" height="160"/>
                                 <subviews>
-                                    <segmentedControl opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="xOL-Sq-r4i">
-                                        <rect key="frame" x="20" y="23" width="140" height="29"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="xOL-Sq-r4i">
+                                        <rect key="frame" x="20" y="23" width="145" height="32"/>
                                         <segments>
                                             <segment title="Solid"/>
                                             <segment title="Gradient"/>
@@ -147,43 +146,84 @@
                                             <action selector="changeSkeletonType:" destination="BYZ-38-t0r" eventType="valueChanged" id="iAS-ab-0jP"/>
                                         </connections>
                                     </segmentedControl>
-                                    <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="vz0-qg-GcZ">
-                                        <rect key="frame" x="310" y="21" width="49" height="31"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="vz0-qg-GcZ">
+                                        <rect key="frame" x="308" y="21" width="51" height="31"/>
                                         <connections>
                                             <action selector="changeAnimated:" destination="BYZ-38-t0r" eventType="valueChanged" id="w1G-gZ-RE0"/>
                                         </connections>
                                     </switch>
-                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Animated" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="WHN-wR-TKt">
-                                        <rect key="frame" x="211" y="28" width="91" height="21"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Animated" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="WHN-wR-TKt">
+                                        <rect key="frame" x="229" y="26" width="73" height="21"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                         <nil key="textColor"/>
                                         <nil key="highlightedColor"/>
                                     </label>
-                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Color" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7CF-rV-pK2">
-                                        <rect key="frame" x="32" y="89" width="52" height="21"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Color" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7CF-rV-pK2">
+                                        <rect key="frame" x="20" y="73.5" width="90" height="21"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                         <nil key="textColor"/>
                                         <nil key="highlightedColor"/>
                                     </label>
-                                    <view contentMode="scaleToFill" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="iGp-rp-t1d">
-                                        <rect key="frame" x="92" y="84" width="30" height="30"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="iGp-rp-t1d">
+                                        <rect key="frame" x="130" y="69" width="30" height="30"/>
                                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                        <constraints>
+                                            <constraint firstAttribute="width" constant="30" id="Q3k-B1-E88"/>
+                                            <constraint firstAttribute="height" constant="30" id="xOD-RY-U4u"/>
+                                        </constraints>
                                     </view>
-                                    <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Mde-Cm-CoS">
-                                        <rect key="frame" x="20" y="74" width="140" height="52"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Mde-Cm-CoS">
+                                        <rect key="frame" x="20" y="58" width="140" height="52"/>
+                                        <constraints>
+                                            <constraint firstAttribute="height" constant="52" id="3GX-2y-eQj"/>
+                                            <constraint firstAttribute="width" constant="140" id="6cC-Y1-RKs"/>
+                                        </constraints>
                                         <connections>
                                             <action selector="btnChangeColorTouchUpInside:" destination="BYZ-38-t0r" eventType="touchUpInside" id="cB8-Ik-LIJ"/>
                                         </connections>
                                     </button>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Tdu-YQ-saq">
+                                        <rect key="frame" x="263" y="69" width="94" height="30"/>
+                                        <state key="normal" title="Hide skeleton"/>
+                                        <connections>
+                                            <action selector="showOrHideSkeleton:" destination="BYZ-38-t0r" eventType="touchUpInside" id="Ma1-WX-Dzy"/>
+                                        </connections>
+                                    </button>
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Fade Duration: 0 sec" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="mrw-PM-jJJ">
+                                        <rect key="frame" x="113.5" y="130" width="141.5" height="18"/>
+                                        <fontDescription key="fontDescription" type="system" pointSize="15"/>
+                                        <nil key="textColor"/>
+                                        <nil key="highlightedColor"/>
+                                    </label>
+                                    <stepper opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" maximumValue="5" stepValue="0.25" translatesAutoresizingMaskIntoConstraints="NO" id="l4N-LL-ZrJ">
+                                        <rect key="frame" x="263" y="123" width="94" height="32"/>
+                                        <connections>
+                                            <action selector="transitionDurationStepperAction:" destination="BYZ-38-t0r" eventType="valueChanged" id="jPN-df-fNs"/>
+                                        </connections>
+                                    </stepper>
                                 </subviews>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <constraints>
-                                    <constraint firstAttribute="height" constant="140" id="OH5-ja-ZlB"/>
+                                    <constraint firstItem="l4N-LL-ZrJ" firstAttribute="leading" secondItem="mrw-PM-jJJ" secondAttribute="trailing" constant="8" id="5iU-dO-qVc"/>
+                                    <constraint firstItem="mrw-PM-jJJ" firstAttribute="centerY" secondItem="l4N-LL-ZrJ" secondAttribute="centerY" id="9OM-mx-4Jo"/>
+                                    <constraint firstAttribute="trailing" secondItem="Tdu-YQ-saq" secondAttribute="trailing" constant="18" id="BQ0-S0-YMp"/>
+                                    <constraint firstItem="iGp-rp-t1d" firstAttribute="trailing" secondItem="Mde-Cm-CoS" secondAttribute="trailing" id="IJ3-CC-5M7"/>
+                                    <constraint firstAttribute="height" constant="160" id="OH5-ja-ZlB"/>
+                                    <constraint firstItem="Mde-Cm-CoS" firstAttribute="leading" secondItem="XgY-1a-UGc" secondAttribute="leading" constant="20" id="Rek-hz-pDw"/>
+                                    <constraint firstItem="xOL-Sq-r4i" firstAttribute="top" secondItem="XgY-1a-UGc" secondAttribute="top" constant="23" id="Udf-0g-bZm"/>
+                                    <constraint firstItem="Tdu-YQ-saq" firstAttribute="top" secondItem="vz0-qg-GcZ" secondAttribute="bottom" constant="17" id="WiR-yP-dyv"/>
+                                    <constraint firstItem="Mde-Cm-CoS" firstAttribute="centerY" secondItem="7CF-rV-pK2" secondAttribute="centerY" id="eaN-FA-4mF"/>
+                                    <constraint firstItem="iGp-rp-t1d" firstAttribute="centerY" secondItem="7CF-rV-pK2" secondAttribute="centerY" id="hBb-mp-AjF"/>
+                                    <constraint firstItem="l4N-LL-ZrJ" firstAttribute="top" secondItem="Tdu-YQ-saq" secondAttribute="bottom" constant="24" id="iA5-RB-pW2"/>
+                                    <constraint firstItem="vz0-qg-GcZ" firstAttribute="top" secondItem="XgY-1a-UGc" secondAttribute="top" constant="21" id="iad-6N-wNf"/>
+                                    <constraint firstItem="vz0-qg-GcZ" firstAttribute="leading" secondItem="WHN-wR-TKt" secondAttribute="trailing" constant="6" id="jgu-tV-gqO"/>
+                                    <constraint firstItem="WHN-wR-TKt" firstAttribute="centerY" secondItem="vz0-qg-GcZ" secondAttribute="centerY" id="kTu-fb-Bc8"/>
+                                    <constraint firstAttribute="trailing" secondItem="vz0-qg-GcZ" secondAttribute="trailing" constant="18" id="ktq-JT-uoR"/>
+                                    <constraint firstItem="xOL-Sq-r4i" firstAttribute="leading" secondItem="XgY-1a-UGc" secondAttribute="leading" constant="20" id="pY0-qd-xmK"/>
+                                    <constraint firstItem="l4N-LL-ZrJ" firstAttribute="trailing" secondItem="Tdu-YQ-saq" secondAttribute="trailing" id="ql2-Z9-dnv"/>
+                                    <constraint firstItem="iGp-rp-t1d" firstAttribute="leading" secondItem="7CF-rV-pK2" secondAttribute="trailing" constant="20" id="vWD-0m-dMp"/>
+                                    <constraint firstItem="7CF-rV-pK2" firstAttribute="centerY" secondItem="Tdu-YQ-saq" secondAttribute="centerY" id="x0d-LB-A4q"/>
+                                    <constraint firstItem="7CF-rV-pK2" firstAttribute="leading" secondItem="xOL-Sq-r4i" secondAttribute="leading" id="yEL-Nv-z76"/>
                                 </constraints>
                             </view>
                         </subviews>
@@ -205,18 +245,57 @@
                             <userDefinedRuntimeAttribute type="boolean" keyPath="isSkeletonable" value="NO"/>
                         </userDefinedRuntimeAttributes>
                     </view>
+                    <tabBarItem key="tabBarItem" title="Item" id="wQY-ap-3n3"/>
                     <navigationItem key="navigationItem" id="BEI-dU-kr2"/>
                     <connections>
                         <outlet property="avatarImage" destination="nMj-pU-5wJ" id="9fa-Z7-vYi"/>
                         <outlet property="colorSelectedView" destination="iGp-rp-t1d" id="0Zm-9d-jRU"/>
+                        <outlet property="showOrHideSkeletonButton" destination="Tdu-YQ-saq" id="gkm-mB-zYD"/>
                         <outlet property="skeletonTypeSelector" destination="xOL-Sq-r4i" id="yTr-8L-I4Y"/>
                         <outlet property="switchAnimated" destination="vz0-qg-GcZ" id="d2R-8x-lRb"/>
                         <outlet property="tableview" destination="UCB-SP-lQk" id="XV0-KX-lAN"/>
+                        <outlet property="transitionDurationLabel" destination="mrw-PM-jJJ" id="BVK-Kl-5Q3"/>
+                        <outlet property="transitionDurationStepper" destination="l4N-LL-ZrJ" id="OJr-Ul-7XR"/>
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="-2582" y="-400"/>
+            <point key="canvasLocation" x="-2682" y="340"/>
+        </scene>
+        <!--Item-->
+        <scene sceneID="Cfc-AT-AS1">
+            <objects>
+                <viewController id="dv8-ph-Ehg" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Jwx-gI-Qod">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                        <viewLayoutGuide key="safeArea" id="Ao1-hk-zrH"/>
+                    </view>
+                    <tabBarItem key="tabBarItem" title="Item" id="iKp-9S-aib"/>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="M03-a6-GOC" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-1644" y="340"/>
+        </scene>
+        <!--Tab Bar Controller-->
+        <scene sceneID="U6k-MC-AHH">
+            <objects>
+                <tabBarController automaticallyAdjustsScrollViewInsets="NO" id="Va7-1y-Tel" sceneMemberID="viewController">
+                    <toolbarItems/>
+                    <tabBar key="tabBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="HSI-2O-RyO">
+                        <rect key="frame" x="0.0" y="0.0" width="1000" height="1000"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                        <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                    </tabBar>
+                    <connections>
+                        <segue destination="BYZ-38-t0r" kind="relationship" relationship="viewControllers" id="dL3-9L-KNU"/>
+                        <segue destination="dv8-ph-Ehg" kind="relationship" relationship="viewControllers" id="8QB-uV-gaF"/>
+                    </connections>
+                </tabBarController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="huq-Fh-0sW" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-2172" y="-555"/>
         </scene>
     </scenes>
     <resources>

Example/TableView/ViewController.swift

@@ -10,7 +10,6 @@ import UIKit
 import SkeletonView
 
 class ViewController: UIViewController {
-    
     @IBOutlet weak var tableview: UITableView! {
         didSet {
             tableview.rowHeight = UITableView.automaticDimension
@@ -35,6 +34,9 @@ class ViewController: UIViewController {
 
     @IBOutlet weak var switchAnimated: UISwitch!
     @IBOutlet weak var skeletonTypeSelector: UISegmentedControl!
+    @IBOutlet weak var showOrHideSkeletonButton: UIButton!
+    @IBOutlet weak var transitionDurationLabel: UILabel!
+    @IBOutlet weak var transitionDurationStepper: UIStepper!
     
     var type: SkeletonType {
         return skeletonTypeSelector.selectedSegmentIndex == 0 ? .solid : .gradient
@@ -43,15 +45,11 @@ class ViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
         tableview.isSkeletonable = true
-    }
-
-    override func viewDidLayoutSubviews() {
-        view.layoutSkeletonIfNeeded()
+        view.showAnimatedSkeleton()
     }
     
     override func viewDidAppear(_ animated: Bool) {
         super.viewDidAppear(animated)
-        view.showAnimatedSkeleton()
     }
 
     @IBAction func changeAnimated(_ sender: Any) {
@@ -70,6 +68,39 @@ class ViewController: UIViewController {
         showAlertPicker()
     }
     
+    @IBAction func showOrHideSkeleton(_ sender: Any) {
+        showOrHideSkeletonButton.setTitle((view.isSkeletonActive ? "Show skeleton" : "Hide skeleton"), for: .normal)
+        view.isSkeletonActive ? hideSkeleton() : showSkeleton()
+    }
+    
+    @IBAction func transitionDurationStepperAction(_ sender: Any) {
+        transitionDurationLabel.text = "Transition duration: \(transitionDurationStepper.value) sec"
+    }
+    
+    func showSkeleton() {
+        if type == .gradient {
+            let gradient = SkeletonGradient(baseColor: colorSelectedView.backgroundColor!)
+            if switchAnimated.isOn {
+                view.showAnimatedGradientSkeleton(usingGradient: gradient, transition: .crossDissolve(transitionDurationStepper.value))
+            }
+            else {
+                view.showGradientSkeleton(usingGradient: gradient, transition: .crossDissolve(transitionDurationStepper.value))
+            }
+        }
+        else {
+            if switchAnimated.isOn {
+                view.showAnimatedSkeleton(transition: .crossDissolve(transitionDurationStepper.value))
+            }
+            else {
+                view.showSkeleton(transition: .crossDissolve(transitionDurationStepper.value))
+            }
+        }
+    }
+    
+    func hideSkeleton() {
+        view.hideSkeleton(transition: .crossDissolve(transitionDurationStepper.value))
+    }
+    
     func refreshSkeleton() {
         if type == .gradient { showOrUpdateGradientSkeleton() }
         else { showOrUpdatepdateSolidSkeleton() }
@@ -93,7 +124,6 @@ class ViewController: UIViewController {
     }
     
     func showAlertPicker() {
-       
         let alertView = UIAlertController(title: "Select color", message: "\n\n\n\n\n\n", preferredStyle: .alert)
         
         let pickerView = UIPickerView(frame: CGRect(x: 0, y: 50, width: 260, height: 115))
@@ -119,7 +149,6 @@ class ViewController: UIViewController {
 }
 
 extension ViewController: UIPickerViewDelegate, UIPickerViewDataSource {
-    
     func numberOfComponents(in pickerView: UIPickerView) -> Int {
         return 1
     }
@@ -134,9 +163,8 @@ extension ViewController: UIPickerViewDelegate, UIPickerViewDataSource {
 }
 
 extension ViewController: SkeletonTableViewDataSource {
-    
     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        return 0
+        return 10
     }
     
     func collectionSkeletonView(_ skeletonView: UITableView, cellIdentifierForRowAt indexPath: IndexPath) -> ReusableCellIdentifier {

Gemfile.lock

@@ -12,10 +12,10 @@ GEM
     atomos (0.1.3)
     babosa (1.0.2)
     claide (1.0.2)
-    cocoapods (1.7.0.beta.3)
+    cocoapods (1.7.5)
       activesupport (>= 4.0.2, < 5)
       claide (>= 1.0.2, < 2.0)
-      cocoapods-core (= 1.7.0.beta.3)
+      cocoapods-core (= 1.7.5)
       cocoapods-deintegrate (>= 1.0.3, < 2.0)
       cocoapods-downloader (>= 1.2.2, < 2.0)
       cocoapods-plugins (>= 1.0.0, < 2.0)
@@ -25,13 +25,13 @@ GEM
       cocoapods-try (>= 1.1.0, < 2.0)
       colored2 (~> 3.1)
       escape (~> 0.0.4)
-      fourflusher (>= 2.2.0, < 3.0)
+      fourflusher (>= 2.3.0, < 3.0)
       gh_inspector (~> 1.0)
       molinillo (~> 0.6.6)
       nap (~> 1.0)
       ruby-macho (~> 1.4)
-      xcodeproj (>= 1.8.2, < 2.0)
-    cocoapods-core (1.7.0.beta.3)
+      xcodeproj (>= 1.10.0, < 2.0)
+    cocoapods-core (1.7.5)
       activesupport (>= 4.0.2, < 6)
       fuzzy_match (~> 2.0.4)
       nap (~> 1.0)
@@ -53,12 +53,12 @@ GEM
     declarative (0.0.10)
     declarative-option (0.1.0)
     digest-crc (0.4.1)
-    domain_name (0.5.20180417)
+    domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
-    dotenv (2.7.2)
+    dotenv (2.7.4)
     emoji_regex (1.0.1)
     escape (0.0.4)
-    excon (0.64.0)
+    excon (0.65.0)
     faraday (0.15.4)
       multipart-post (>= 1.2, < 3)
     faraday-cookie_jar (0.0.6)
@@ -67,7 +67,7 @@ GEM
     faraday_middleware (0.13.1)
       faraday (>= 0.7.4, < 1.0)
     fastimage (2.1.5)
-    fastlane (2.121.0)
+    fastlane (2.128.0)
       CFPropertyList (>= 2.3, < 4.0.0)
       addressable (>= 2.3, < 3.0.0)
       babosa (>= 1.0.2, < 2.0.0)
@@ -86,8 +86,8 @@ GEM
       google-cloud-storage (>= 1.15.0, < 2.0.0)
       highline (>= 1.7.2, < 2.0.0)
       json (< 3.0.0)
-      mini_magick (~> 4.5.1)
-      multi_json
+      jwt (~> 2.1.0)
+      mini_magick (>= 4.9.4, < 5.0.0)
       multi_xml (~> 0.5)
       multipart-post (~> 2.0.0)
       plist (>= 3.1.0, < 4.0.0)
@@ -104,7 +104,7 @@ GEM
       xcodeproj (>= 1.8.1, < 2.0.0)
       xcpretty (~> 0.3.0)
       xcpretty-travis-formatter (>= 0.0.3)
-    fourflusher (2.2.0)
+    fourflusher (2.3.1)
     fuzzy_match (2.0.4)
     gh_inspector (1.1.3)
     google-api-client (0.23.9)
@@ -117,7 +117,7 @@ GEM
       signet (~> 0.9)
     google-cloud-core (1.3.0)
       google-cloud-env (~> 1.0)
-    google-cloud-env (1.0.5)
+    google-cloud-env (1.2.0)
       faraday (~> 0.11)
     google-cloud-storage (1.16.0)
       digest-crc (~> 0.4)
@@ -143,7 +143,7 @@ GEM
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0331)
-    mini_magick (4.5.1)
+    mini_magick (4.9.5)
     minitest (5.11.3)
     molinillo (0.6.6)
     multi_json (1.13.1)
@@ -153,7 +153,7 @@ GEM
     nap (1.1.0)
     naturally (2.2.0)
     netrc (0.11.0)
-    os (1.0.0)
+    os (1.0.1)
     plist (3.5.0)
     public_suffix (2.0.5)
     representable (3.0.4)
@@ -163,7 +163,7 @@ GEM
     retriable (3.1.2)
     rouge (2.0.7)
     ruby-macho (1.4.0)
-    rubyzip (1.2.2)
+    rubyzip (1.2.3)
     security (0.1.3)
     signet (0.11.0)
       addressable (~> 2.3)
@@ -178,19 +178,19 @@ GEM
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     thread_safe (0.3.6)
-    tty-cursor (0.6.1)
-    tty-screen (0.6.5)
-    tty-spinner (0.9.0)
-      tty-cursor (~> 0.6.0)
+    tty-cursor (0.7.0)
+    tty-screen (0.7.0)
+    tty-spinner (0.9.1)
+      tty-cursor (~> 0.7)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uber (0.1.0)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.6)
-    unicode-display_width (1.5.0)
+    unicode-display_width (1.6.0)
     word_wrap (1.0.0)
-    xcodeproj (1.8.2)
+    xcodeproj (1.11.0)
       CFPropertyList (>= 2.3.3, < 4.0)
       atomos (~> 0.1.3)
       claide (>= 1.0.2, < 2.0)
@@ -209,4 +209,4 @@ DEPENDENCIES
   fastlane
 
 BUNDLED WITH
-   1.16.6
+   2.0.1

README.md

@@ -22,6 +22,9 @@
         <img src="https://img.shields.io/badge/contact-@JuanpeCatalan-blue.svg?style=flat" alt="Twitter: @JuanpeCatalan" />
     </a>
     <br/>
+    <a href="https://gitter.im/SkeletonView/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge">
+        <img src="https://badges.gitter.im/SkeletonView/community.svg?style=flat" />
+    </a>
     <a href="https://twitter.com/intent/tweet?text=Wow%20This%20library%20is%20awesome:&url=https%3A%2F%2Fgithub.com%2FJuanpe%2FSkeletonView">
       <img src="https://img.shields.io/twitter/url/https/github.com/Juanpe/SkeletonView.svg?style=social" alt="License" />
     </a>
@@ -50,6 +53,7 @@ Enjoy it! 🙂
   * [Custom colors](#-custom-colors)
   * [Appearance](#-appearance)
   * [Custom animations](#-custom-animations)
+  * [Transitions](#-transitions)
   * [Hierarchy](#-hierarchy)
   * [Debug](#-debug)
 * [Documentation](#-documentation)
@@ -99,7 +103,7 @@ Once you have your Swift package set up, adding `SkeletonView` as a dependency i
 
 ```swift
   dependencies: [
-    .package(url: "https://github.com/Juanpe/SkeletonView.git", from: "1.7")
+    .package(url: "https://github.com/Juanpe/SkeletonView.git", from: "1.7.0")
   ]
 ```
 
@@ -173,7 +177,7 @@ avatarImageView.isSkeletonable = true
 
 #### Skeleton views layout
 
-Sometimes skeleton layout may not fit your layout because the parent view bounds have changed. For example, rotating the device.
+Sometimes skeleton layout may not fit your layout because the parent view bounds have changed. ~For example, rotating the device.~
 
 You can relayout the skeleton views like so:
 
@@ -183,6 +187,8 @@ override func viewDidLayoutSubviews() {
 }
 ```
 
+⚠️⚠️ You shouldn't call this method. From *version 1.8.1* you don't need to call this method, the library does automatically. So, you can use this method *ONLY* in the cases when you need to update the layout of the skeleton manually.
+
 #### Update skeleton configuration
 
 You can change the skeleton configuration at any time like its colour, animation, etc. with the following methods:
@@ -390,20 +396,63 @@ view.showAnimatedGradientSkeleton(usingGradient: gradient, animation: animation)
 Exist another way to create sliding animations, just using this shortcut:
 >>```let animation = GradientDirection.leftToRight.slidingAnimation()```
 
+
+
+### 🏄 Transitions
+
+```SkeletonView``` has build-in transitions to **show** or **hide** the skeletons in a *smoother* way 🤙
+
+To use the transition, simply add the ```transition``` parameter to your ```showSkeleton()``` or ```hideSkeleton()``` function with the transition time, like this:
+
+```swift
+view.showSkeleton(transition: .crossDissolve(0.25))     //Show skeleton cross dissolve transition with 0.25 seconds fade time
+view.hideSkeleton(transition: .crossDissolve(0.25))     //Hide skeleton cross dissolve transition with 0.25 seconds fade time
+
+```
+
+**Preview**
+
+<table>
+<tr>
+<td width="50%">
+<center>None</center>
+</td>
+<td width="50%">
+<center>Cross dissolve</center>
+</td>
+</tr>
+<tr>
+<td width="50%">
+<img src="Assets/skeleton_transition_nofade.gif"></img>
+</td>
+<td width="50%">
+<img src="Assets/skeleton_transition_fade.gif"></img>
+</td>
+</tr>
+</table>
+
+
 ### 👨‍👧‍👦 Hierarchy
 
 Since ```SkeletonView``` is recursive, and we want skeleton to be very efficient, we want to stop recursion as soon as possible. For this reason, you must set the container view as `Skeletonable`, because Skeleton will stop looking for `skeletonable` subviews as soon as a view is not Skeletonable, breaking then the recursion.
 
 Because an image is worth a thousand words:
 
+In this example we have a `UIViewController` with a `ContainerView` and a `UITableView`. When the view is ready, we show the skeleton using this method:
+```
+view.showSkeleton()
+```
+
 > ```ìsSkeletonable```= ☠️
 
-| Configuration | Result
-|------- | -------
-|![](Assets/no_skeletonable.png) | ![](Assets/no_skeletonables_result.png)
-|![](Assets/container_no_skeletonable.png) | ![](Assets/no_skeletonables_result.png)
-|![](Assets/container_skeletonable.png) | ![](Assets/container_skeletonable_result.png)
-|![](Assets/all_skeletonables.png) | ![](Assets/all_skeletonables_result.png)
+| Configuration | Result|
+|:-------:|:-------:|
+|<img src="Assets/no_skeletonable.jpg" width="350"/> | <img src="Assets/no_skeletonables_result.png" width="350"/>|
+|<img src="Assets/container_no_skeletonable.jpg" width="350"/> | <img src="Assets/no_skeletonables_result.png" width="350"/>|
+|<img src="Assets/container_skeletonable.jpg" width="350"/> | <img src="Assets/container_skeletonable_result.png" width="350"/>|
+|<img src="Assets/all_skeletonables.jpg" width="350"/>| <img src="Assets/all_skeletonables_result.png" width="350"/>|
+|<img src="Assets/tableview_no_skeletonable.jpg" width="350"/> | <img src="Assets/tableview_no_skeletonable_result.png" height="350"/>|
+|<img src="Assets/tableview_skeletonable.jpg" width="350"/> | <img src="Assets/tableview_skeletonable_result.png" height="350"/>|
 
 
 ### 🔬 Debug
@@ -439,7 +488,7 @@ Coming soon...😅
 
 * iOS 9.0+
 * tvOS 9.0+
-* Swift 4.2
+* Swift 5
 
 ## 📬 Next steps
 
@@ -451,8 +500,8 @@ Coming soon...😅
 * [x] Add recovery state
 * [x] Custom default appearance
 * [x] Debug mode
+* [x] Add animations when it shows/hides the skeletons
 * [ ] Custom collections compatible
-* [ ] Add animations when it shows/hides the skeletons
 * [ ] MacOS and WatchOS compatible
 
 ## ❤️ Contributing
@@ -479,6 +528,7 @@ See [all contributors](https://github.com/Juanpe/SkeletonView/graphs/contributor
 - [CocoaControls](https://www.cocoacontrols.com/controls/skeletonview)
 - [Awesome iOS Newsletter #74](https://ios.libhunt.com/newsletter/74)
 - [Swift News #36](https://www.youtube.com/watch?v=mAGpsQiy6so)
+- [Best iOS articles, new tools & more](https://medium.com/flawless-app-stories/best-ios-articles-new-tools-more-fcbe673e10d)
 
 
 

SkeletonView.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "SkeletonView"
-  s.version      = "1.7"
+  s.version      = "1.8.2"
   s.summary      = "An elegant way to show users that something is happening and also prepare them to which contents he is waiting"
   s.description  = <<-DESC
   Today almost all apps have async processes, as API requests, long runing processes, etc. And while the processes are working, usually developers place a loading view to show users that something is going on.

SkeletonView.xcodeproj/project.pbxproj

@@ -17,7 +17,6 @@
 		17DD0E0F207FB28C00C56334 /* CALayer+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F622421FAC81FD007C062A /* CALayer+Extensions.swift */; };
 		17DD0E10207FB28C00C56334 /* UIColor+Skeleton.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F622401FAC6E31007C062A /* UIColor+Skeleton.swift */; };
 		17DD0E11207FB28C00C56334 /* UIView+Frame.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5307E2D1FB0E5E400EE67C5 /* UIView+Frame.swift */; };
-		17DD0E12207FB28C00C56334 /* UIView+IBInspectable.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F899CF1FAA6A4D002E8FDA /* UIView+IBInspectable.swift */; };
 		17DD0E13207FB28C00C56334 /* UIView+UIApplicationDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = F587FB85202CEC95002DB5FE /* UIView+UIApplicationDelegate.swift */; };
 		17DD0E14207FB28F00C56334 /* SkeletonAnimationBuilder.swift in Sources */ = {isa = PBXBuildFile; fileRef = F51DE1081FBF70A70037919A /* SkeletonAnimationBuilder.swift */; };
 		17DD0E15207FB28F00C56334 /* SkeletonAppearance.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5307E2F1FB0EC9D00EE67C5 /* SkeletonAppearance.swift */; };
@@ -29,7 +28,8 @@
 		17DD0E1D207FB32100C56334 /* ContainsMultilineText.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5307E3A1FB123C100EE67C5 /* ContainsMultilineText.swift */; };
 		17DD0E1E207FB32100C56334 /* PrepareForSkeletonProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = F56B94451FAE20AF0095662F /* PrepareForSkeletonProtocol.swift */; };
 		17DD0E1F207FB32100C56334 /* RecursiveProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5307E311FB0F42F00EE67C5 /* RecursiveProtocol.swift */; };
-		3B83EE4820C41488005178A4 /* UIView+IBInspectable.swift in Headers */ = {isa = PBXBuildFile; fileRef = 3B83EE4620C41488005178A4 /* UIView+IBInspectable.swift */; settings = {ATTRIBUTES = (Public, ); }; };
+		1E6C67A2230E76CC0019D87B /* SkeletonTransitionStyle.swift in Sources */ = {isa = PBXBuildFile; fileRef = E4CE587C22EEE65200333067 /* SkeletonTransitionStyle.swift */; };
+		1E6C67A3230E76CE0019D87B /* UIView+Transitions.swift in Sources */ = {isa = PBXBuildFile; fileRef = E4CE587B22EEE63100333067 /* UIView+Transitions.swift */; };
 		42ABD063210B548200BEEFF4 /* SkeletonView.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 52D6D97C1BEFF229002C0205 /* SkeletonView.framework */; };
 		42ABD069210B548200BEEFF4 /* SkeletonView.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 52D6D97C1BEFF229002C0205 /* SkeletonView.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		42ABD078210B54E200BEEFF4 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 42ABD070210B54E100BEEFF4 /* AppDelegate.swift */; };
@@ -46,7 +46,6 @@
 		872D5A5D21C24EDD0037D763 /* UILabel+Multiline.swift in Sources */ = {isa = PBXBuildFile; fileRef = 872D5A5B21C24EDD0037D763 /* UILabel+Multiline.swift */; };
 		872D5A5F21C24F8E0037D763 /* UITextView+Multiline.swift in Sources */ = {isa = PBXBuildFile; fileRef = 872D5A5E21C24F8E0037D763 /* UITextView+Multiline.swift */; };
 		872D5A6021C24F8E0037D763 /* UITextView+Multiline.swift in Sources */ = {isa = PBXBuildFile; fileRef = 872D5A5E21C24F8E0037D763 /* UITextView+Multiline.swift */; };
-		8748240D20C6A88A00E92179 /* UIView+IBInspectable.swift in Headers */ = {isa = PBXBuildFile; fileRef = F5F899CF1FAA6A4D002E8FDA /* UIView+IBInspectable.swift */; settings = {ATTRIBUTES = (Public, ); }; };
 		8748240E20C6A88E00E92179 /* ContainsMultilineText.swift in Headers */ = {isa = PBXBuildFile; fileRef = F5307E3A1FB123C100EE67C5 /* ContainsMultilineText.swift */; settings = {ATTRIBUTES = (Public, ); }; };
 		877EFA4521BEE9D80031FC00 /* SkeletonLayerBuilder.swift in Sources */ = {isa = PBXBuildFile; fileRef = 877EFA4421BEE9D80031FC00 /* SkeletonLayerBuilder.swift */; };
 		877EFA4621BEE9D80031FC00 /* SkeletonLayerBuilder.swift in Sources */ = {isa = PBXBuildFile; fileRef = 877EFA4421BEE9D80031FC00 /* SkeletonLayerBuilder.swift */; };
@@ -57,6 +56,8 @@
 		8785E3A3211C9CE800CC9DFD /* Constants.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88DEA97D1FCDBD1F006C80EF /* Constants.swift */; };
 		88DEA97F1FCDBD78006C80EF /* Constants.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88DEA97D1FCDBD1F006C80EF /* Constants.swift */; };
 		8933C7851EB5B820000D00A4 /* SkeletonView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8933C7841EB5B820000D00A4 /* SkeletonView.swift */; };
+		E4CE587D22EEE65200333067 /* SkeletonTransitionStyle.swift in Sources */ = {isa = PBXBuildFile; fileRef = E4CE587C22EEE65200333067 /* SkeletonTransitionStyle.swift */; };
+		E4CE588B22EEF70D00333067 /* UIView+Transitions.swift in Sources */ = {isa = PBXBuildFile; fileRef = E4CE587B22EEE63100333067 /* UIView+Transitions.swift */; };
 		F51DE1091FBF70A70037919A /* SkeletonAnimationBuilder.swift in Sources */ = {isa = PBXBuildFile; fileRef = F51DE1081FBF70A70037919A /* SkeletonAnimationBuilder.swift */; };
 		F51DF871206E91B300D23301 /* SkeletonReusableCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = F51DF870206E91B300D23301 /* SkeletonReusableCell.swift */; };
 		F51DF873206E91FB00D23301 /* GenericCollectionView.swift in Sources */ = {isa = PBXBuildFile; fileRef = F51DF872206E91FB00D23301 /* GenericCollectionView.swift */; };
@@ -77,6 +78,10 @@
 		F54CF5E52024CEB000330B0D /* UITableView+CollectionSkeleton.swift in Sources */ = {isa = PBXBuildFile; fileRef = F54CF5E22024CEAF00330B0D /* UITableView+CollectionSkeleton.swift */; };
 		F54CF5E62024CEB000330B0D /* UICollectionView+CollectionSkeleton.swift in Sources */ = {isa = PBXBuildFile; fileRef = F54CF5E32024CEB000330B0D /* UICollectionView+CollectionSkeleton.swift */; };
 		F56B94461FAE20AF0095662F /* PrepareForSkeletonProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = F56B94451FAE20AF0095662F /* PrepareForSkeletonProtocol.swift */; };
+		F570ABF42314629700390248 /* Swizzling.swift in Sources */ = {isa = PBXBuildFile; fileRef = F570ABF32314629700390248 /* Swizzling.swift */; };
+		F570ABF52314629700390248 /* Swizzling.swift in Sources */ = {isa = PBXBuildFile; fileRef = F570ABF32314629700390248 /* Swizzling.swift */; };
+		F5804772230ECD0000066D02 /* UIView+IBInspectable.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5804771230ECD0000066D02 /* UIView+IBInspectable.swift */; };
+		F5804773230ECD0000066D02 /* UIView+IBInspectable.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5804771230ECD0000066D02 /* UIView+IBInspectable.swift */; };
 		F587FB84202CBFC8002DB5FE /* SkeletonFlow.swift in Sources */ = {isa = PBXBuildFile; fileRef = F587FB83202CBFC8002DB5FE /* SkeletonFlow.swift */; };
 		F587FB86202CEC95002DB5FE /* UIView+UIApplicationDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = F587FB85202CEC95002DB5FE /* UIView+UIApplicationDelegate.swift */; };
 		F58A6E6B20A8C54100612494 /* RecoverableViewState.swift in Sources */ = {isa = PBXBuildFile; fileRef = F58A6E6A20A8C54100612494 /* RecoverableViewState.swift */; };
@@ -90,7 +95,6 @@
 		F5F622411FAC6E31007C062A /* UIColor+Skeleton.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F622401FAC6E31007C062A /* UIColor+Skeleton.swift */; };
 		F5F622431FAC81FD007C062A /* CALayer+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F622421FAC81FD007C062A /* CALayer+Extensions.swift */; };
 		F5F622451FACA338007C062A /* Cell.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F622441FACA338007C062A /* Cell.swift */; };
-		F5F899D01FAA6A4D002E8FDA /* UIView+IBInspectable.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F899CF1FAA6A4D002E8FDA /* UIView+IBInspectable.swift */; };
 		F5F899D21FAB9630002E8FDA /* AssociationPolicy.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F899D11FAB9630002E8FDA /* AssociationPolicy.swift */; };
 		F5F899E91FAB9D2B002E8FDA /* SkeletonLayer.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F899E81FAB9D2B002E8FDA /* SkeletonLayer.swift */; };
 		F5F899EB1FAB9DA3002E8FDA /* SkeletonCollectionDataSource.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5F899EA1FAB9DA3002E8FDA /* SkeletonCollectionDataSource.swift */; };
@@ -148,7 +152,6 @@
 		17DD0E00207FB27400C56334 /* SkeletonView.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = SkeletonView.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		17DD0E1A207FB2C200C56334 /* SkeletonView-tvOS.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = "SkeletonView-tvOS.plist"; sourceTree = "<group>"; };
 		17DD0E1B207FB2C200C56334 /* SkeletonView-iOS.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = "SkeletonView-iOS.plist"; sourceTree = "<group>"; };
-		3B83EE4620C41488005178A4 /* UIView+IBInspectable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = "UIView+IBInspectable.swift"; path = "Sources/Extensions/UIView+IBInspectable.swift"; sourceTree = "<group>"; };
 		42ABD06D210B548200BEEFF4 /* SkeletonViewExampleUICollectionView.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = SkeletonViewExampleUICollectionView.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		42ABD070210B54E100BEEFF4 /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		42ABD071210B54E100BEEFF4 /* Main.storyboard */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.storyboard; path = Main.storyboard; sourceTree = "<group>"; };
@@ -167,6 +170,8 @@
 		8785E3A0211C9C9800CC9DFD /* SkeletonDebug.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SkeletonDebug.swift; sourceTree = "<group>"; };
 		88DEA97D1FCDBD1F006C80EF /* Constants.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Constants.swift; sourceTree = "<group>"; };
 		8933C7841EB5B820000D00A4 /* SkeletonView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SkeletonView.swift; sourceTree = "<group>"; };
+		E4CE587B22EEE63100333067 /* UIView+Transitions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIView+Transitions.swift"; sourceTree = "<group>"; };
+		E4CE587C22EEE65200333067 /* SkeletonTransitionStyle.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SkeletonTransitionStyle.swift; sourceTree = "<group>"; };
 		F51DE1081FBF70A70037919A /* SkeletonAnimationBuilder.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SkeletonAnimationBuilder.swift; sourceTree = "<group>"; };
 		F51DF870206E91B300D23301 /* SkeletonReusableCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SkeletonReusableCell.swift; sourceTree = "<group>"; };
 		F51DF872206E91FB00D23301 /* GenericCollectionView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GenericCollectionView.swift; sourceTree = "<group>"; };
@@ -182,6 +187,8 @@
 		F54CF5E22024CEAF00330B0D /* UITableView+CollectionSkeleton.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "UITableView+CollectionSkeleton.swift"; sourceTree = "<group>"; };
 		F54CF5E32024CEB000330B0D /* UICollectionView+CollectionSkeleton.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "UICollectionView+CollectionSkeleton.swift"; sourceTree = "<group>"; };
 		F56B94451FAE20AF0095662F /* PrepareForSkeletonProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PrepareForSkeletonProtocol.swift; sourceTree = "<group>"; };
+		F570ABF32314629700390248 /* Swizzling.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Swizzling.swift; sourceTree = "<group>"; };
+		F5804771230ECD0000066D02 /* UIView+IBInspectable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "UIView+IBInspectable.swift"; sourceTree = "<group>"; };
 		F587FB83202CBFC8002DB5FE /* SkeletonFlow.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SkeletonFlow.swift; sourceTree = "<group>"; };
 		F587FB85202CEC95002DB5FE /* UIView+UIApplicationDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIView+UIApplicationDelegate.swift"; sourceTree = "<group>"; };
 		F58A6E6A20A8C54100612494 /* RecoverableViewState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RecoverableViewState.swift; sourceTree = "<group>"; };
@@ -191,7 +198,6 @@
 		F5F622401FAC6E31007C062A /* UIColor+Skeleton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIColor+Skeleton.swift"; sourceTree = "<group>"; };
 		F5F622421FAC81FD007C062A /* CALayer+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "CALayer+Extensions.swift"; sourceTree = "<group>"; };
 		F5F622441FACA338007C062A /* Cell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Cell.swift; sourceTree = "<group>"; };
-		F5F899CF1FAA6A4D002E8FDA /* UIView+IBInspectable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIView+IBInspectable.swift"; sourceTree = "<group>"; };
 		F5F899D11FAB9630002E8FDA /* AssociationPolicy.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AssociationPolicy.swift; sourceTree = "<group>"; };
 		F5F899E81FAB9D2B002E8FDA /* SkeletonLayer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SkeletonLayer.swift; sourceTree = "<group>"; };
 		F5F899EA1FAB9DA3002E8FDA /* SkeletonCollectionDataSource.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SkeletonCollectionDataSource.swift; sourceTree = "<group>"; };
@@ -242,7 +248,6 @@
 		52D6D9721BEFF229002C0205 = {
 			isa = PBXGroup;
 			children = (
-				3B83EE4620C41488005178A4 /* UIView+IBInspectable.swift */,
 				F5F899F31FABA607002E8FDA /* Example */,
 				8933C7811EB5B7E0000D00A4 /* Sources */,
 				52D6D99C1BEFF38C002C0205 /* Configs */,
@@ -336,6 +341,7 @@
 		8933C7811EB5B7E0000D00A4 /* Sources */ = {
 			isa = PBXGroup;
 			children = (
+				E4CE587A22EEE62300333067 /* Transitions */,
 				872D5A5A21C24E7C0037D763 /* Multilines */,
 				877EFA4321BEE9C40031FC00 /* Builders */,
 				8785E39F211C9C7C00CC9DFD /* Debug */,
@@ -364,6 +370,15 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
+		E4CE587A22EEE62300333067 /* Transitions */ = {
+			isa = PBXGroup;
+			children = (
+				E4CE587B22EEE63100333067 /* UIView+Transitions.swift */,
+				E4CE587C22EEE65200333067 /* SkeletonTransitionStyle.swift */,
+			);
+			path = Transitions;
+			sourceTree = "<group>";
+		};
 		F51DF874206E94D300D23301 /* CollectionViews */ = {
 			isa = PBXGroup;
 			children = (
@@ -409,12 +424,12 @@
 			isa = PBXGroup;
 			children = (
 				F5F622421FAC81FD007C062A /* CALayer+Extensions.swift */,
-				F5F622401FAC6E31007C062A /* UIColor+Skeleton.swift */,
-				F5307E2D1FB0E5E400EE67C5 /* UIView+Frame.swift */,
-				F5F899CF1FAA6A4D002E8FDA /* UIView+IBInspectable.swift */,
-				872D5A5521C177E20037D763 /* UIView+Extension.swift */,
-				F587FB85202CEC95002DB5FE /* UIView+UIApplicationDelegate.swift */,
 				F5A5E8B3211DCE7000FD20D0 /* Int+Whitespaces.swift */,
+				F5F622401FAC6E31007C062A /* UIColor+Skeleton.swift */,
+				872D5A5521C177E20037D763 /* UIView+Extension.swift */,
+				F5307E2D1FB0E5E400EE67C5 /* UIView+Frame.swift */,
+				F5804771230ECD0000066D02 /* UIView+IBInspectable.swift */,
+				F587FB85202CEC95002DB5FE /* UIView+UIApplicationDelegate.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -425,6 +440,7 @@
 				F5F899D11FAB9630002E8FDA /* AssociationPolicy.swift */,
 				F56B94451FAE20AF0095662F /* PrepareForSkeletonProtocol.swift */,
 				F5307E311FB0F42F00EE67C5 /* RecursiveProtocol.swift */,
+				F570ABF32314629700390248 /* Swizzling.swift */,
 			);
 			path = Helpers;
 			sourceTree = "<group>";
@@ -470,7 +486,6 @@
 			isa = PBXHeadersBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				8748240D20C6A88A00E92179 /* UIView+IBInspectable.swift in Headers */,
 				8748240E20C6A88E00E92179 /* ContainsMultilineText.swift in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -479,7 +494,6 @@
 			isa = PBXHeadersBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				3B83EE4820C41488005178A4 /* UIView+IBInspectable.swift in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -662,6 +676,7 @@
 				17DD0E08207FB28900C56334 /* CollectionSkeletonProtocol.swift in Sources */,
 				F58A6E6C20A8C54100612494 /* RecoverableViewState.swift in Sources */,
 				17DD0E0B207FB28900C56334 /* SkeletonTableViewProtocols.swift in Sources */,
+				1E6C67A2230E76CC0019D87B /* SkeletonTransitionStyle.swift in Sources */,
 				17DD0E0D207FB28900C56334 /* UITableView+CollectionSkeleton.swift in Sources */,
 				17DD0E0E207FB28900C56334 /* UIView+CollectionSkeleton.swift in Sources */,
 				877EFA4921BEED760031FC00 /* SkeletonMultilineLayerBuilder.swift in Sources */,
@@ -671,9 +686,10 @@
 				17DD0E19207FB28F00C56334 /* SkeletonFlow.swift in Sources */,
 				17DD0E09207FB28900C56334 /* SkeletonCollectionDataSource.swift in Sources */,
 				17DD0E0C207FB28900C56334 /* UICollectionView+CollectionSkeleton.swift in Sources */,
+				F5804773230ECD0000066D02 /* UIView+IBInspectable.swift in Sources */,
 				17DD0E13207FB28C00C56334 /* UIView+UIApplicationDelegate.swift in Sources */,
+				F570ABF52314629700390248 /* Swizzling.swift in Sources */,
 				F5D3FB0C209DCAA300003FCF /* SubviewsSkeletonables.swift in Sources */,
-				17DD0E12207FB28C00C56334 /* UIView+IBInspectable.swift in Sources */,
 				17DD0E14207FB28F00C56334 /* SkeletonAnimationBuilder.swift in Sources */,
 				17DD0E11207FB28C00C56334 /* UIView+Frame.swift in Sources */,
 				17DD0E15207FB28F00C56334 /* SkeletonAppearance.swift in Sources */,
@@ -688,6 +704,7 @@
 				17DD0E1D207FB32100C56334 /* ContainsMultilineText.swift in Sources */,
 				17DD0E0F207FB28C00C56334 /* CALayer+Extensions.swift in Sources */,
 				17DD0E16207FB28F00C56334 /* SkeletonGradient.swift in Sources */,
+				1E6C67A3230E76CE0019D87B /* UIView+Transitions.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -706,8 +723,8 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				E4CE588B22EEF70D00333067 /* UIView+Transitions.swift in Sources */,
 				872D5A5621C177E20037D763 /* UIView+Extension.swift in Sources */,
-				F5F899D01FAA6A4D002E8FDA /* UIView+IBInspectable.swift in Sources */,
 				872D5A5C21C24EDD0037D763 /* UILabel+Multiline.swift in Sources */,
 				F54CF5E42024CEB000330B0D /* UIView+CollectionSkeleton.swift in Sources */,
 				F5307E371FB1076E00EE67C5 /* SkeletonTableViewProtocols.swift in Sources */,
@@ -719,13 +736,16 @@
 				F5307E321FB0F42F00EE67C5 /* RecursiveProtocol.swift in Sources */,
 				F5F622431FAC81FD007C062A /* CALayer+Extensions.swift in Sources */,
 				877EFA4821BEED760031FC00 /* SkeletonMultilineLayerBuilder.swift in Sources */,
+				E4CE587D22EEE65200333067 /* SkeletonTransitionStyle.swift in Sources */,
 				F5F899ED1FAB9F04002E8FDA /* CollectionSkeletonProtocol.swift in Sources */,
 				F58A6E6E20A8C66300612494 /* Recoverable.swift in Sources */,
 				F5307E2C1FAF6BC900EE67C5 /* SkeletonGradient.swift in Sources */,
 				F587FB86202CEC95002DB5FE /* UIView+UIApplicationDelegate.swift in Sources */,
 				F5F899EB1FAB9DA3002E8FDA /* SkeletonCollectionDataSource.swift in Sources */,
 				F5F622411FAC6E31007C062A /* UIColor+Skeleton.swift in Sources */,
+				F5804772230ECD0000066D02 /* UIView+IBInspectable.swift in Sources */,
 				F587FB84202CBFC8002DB5FE /* SkeletonFlow.swift in Sources */,
+				F570ABF42314629700390248 /* Swizzling.swift in Sources */,
 				F5D3FB0B209DCAA300003FCF /* SubviewsSkeletonables.swift in Sources */,
 				F5F899D21FAB9630002E8FDA /* AssociationPolicy.swift in Sources */,
 				F54CF5E62024CEB000330B0D /* UICollectionView+CollectionSkeleton.swift in Sources */,
@@ -1024,7 +1044,7 @@
 		52D6D9911BEFF229002C0205 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				APPLICATION_EXTENSION_API_ONLY = YES;
+				APPLICATION_EXTENSION_API_ONLY = NO;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
@@ -1049,7 +1069,7 @@
 		52D6D9921BEFF229002C0205 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				APPLICATION_EXTENSION_API_ONLY = YES;
+				APPLICATION_EXTENSION_API_ONLY = NO;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";

Sources/Appearance/SkeletonAppearance.swift

@@ -17,7 +17,6 @@ public enum SkeletonAppearance {
 
 // codebeat:disable[TOO_MANY_IVARS]
 class SkeletonViewAppearance: Appearance {
-
     static var shared = SkeletonViewAppearance()
 
     var tintColor: UIColor = .clouds

Sources/Builders/SkeletonLayerBuilder.swift

@@ -5,7 +5,6 @@ import UIKit
 /// Object that facilitates the creation of skeleton layers,
 /// based on the builder pattern
 class SkeletonLayerBuilder {
-
     var skeletonType: SkeletonType?
     var colors: [UIColor] = []
     var holder: UIView?
@@ -27,15 +26,15 @@ class SkeletonLayerBuilder {
     func setHolder(_ holder: UIView) -> SkeletonLayerBuilder {
         self.holder = holder
         return self
-    }
-
-    func build() -> SkeletonLayer? {
-        guard let type = skeletonType,
-              let holder = holder
-            else { return nil }
-
-        return SkeletonLayer(withType: type,
-                             usingColors: colors,
-                             andSkeletonHolder: holder)
-    }
+	}
+	
+	func build() -> SkeletonLayer? {
+		guard let type = skeletonType,
+			let holder = holder
+			else { return nil }
+		
+		return SkeletonLayer(type: type,
+							 colors: colors,
+							 skeletonHolder: holder)
+	}
 }

Sources/Builders/SkeletonMultilineLayerBuilder.swift

@@ -5,7 +5,6 @@ import UIKit
 /// Object that facilitates the creation of skeleton layers for multiline
 /// elements, based on the builder pattern
 class SkeletonMultilineLayerBuilder {
-
     var skeletonType: SkeletonType?
     var index: Int?
     var width: CGFloat?

Sources/Collections/CollectionSkeletonProtocol.swift

@@ -29,6 +29,6 @@ extension CollectionSkeleton where Self: UIScrollView {
     var estimatedNumberOfRows: Int { return 0 }
     func addDummyDataSource() {}
     func removeDummyDataSource(reloadAfter: Bool) {}
-    func disableUserInteraction() { isScrollEnabled = false }
-    func enableUserInteraction() { isScrollEnabled = true }
+    func disableUserInteraction() { isUserInteractionEnabled = false; isScrollEnabled = false }
+    func enableUserInteraction() { isUserInteractionEnabled = true; isScrollEnabled = true }
 }

Sources/Collections/CollectionViews/SkeletonCollectionViewProtocols.swift

@@ -17,7 +17,6 @@ public protocol SkeletonCollectionViewDataSource: UICollectionViewDataSource {
 }
 
 public extension SkeletonCollectionViewDataSource {
-    
     func collectionSkeletonView(_ skeletonView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
         return skeletonView.estimatedNumberOfRows
     }

Sources/Collections/CollectionViews/UICollectionView+CollectionSkeleton.swift

@@ -9,7 +9,6 @@
 import UIKit
 
 extension UICollectionView: CollectionSkeleton {
-    
     var estimatedNumberOfRows: Int {
         guard let flowlayout = collectionViewLayout as? UICollectionViewFlowLayout else { return 0 }
         return Int(ceil(frame.height/flowlayout.itemSize.height))

Sources/Collections/SkeletonCollectionDataSource.swift

@@ -11,7 +11,6 @@ import UIKit
 public typealias ReusableCellIdentifier = String
 
 class SkeletonCollectionDataSource: NSObject {
-    
     weak var originalTableViewDataSource: SkeletonTableViewDataSource?
     weak var originalCollectionViewDataSource: SkeletonCollectionViewDataSource?
     var rowHeight: CGFloat = 0.0
@@ -26,13 +25,12 @@ class SkeletonCollectionDataSource: NSObject {
 
 // MARK: - UITableViewDataSource
 extension SkeletonCollectionDataSource: UITableViewDataSource {
-    
     func numberOfSections(in tableView: UITableView) -> Int {
-        return originalTableViewDataSource?.numSections(in:tableView) ?? 0
+        return originalTableViewDataSource?.numSections(in: tableView) ?? 0
     }
     
     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        return originalTableViewDataSource?.collectionSkeletonView(tableView, numberOfRowsInSection:section) ?? 0
+        return originalTableViewDataSource?.collectionSkeletonView(tableView, numberOfRowsInSection: section) ?? 0
     }
     
     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
@@ -45,7 +43,6 @@ extension SkeletonCollectionDataSource: UITableViewDataSource {
 
 // MARK: - UICollectionViewDataSource
 extension SkeletonCollectionDataSource: UICollectionViewDataSource {
-    
     func numberOfSections(in collectionView: UICollectionView) -> Int {
         return originalCollectionViewDataSource?.numSections(in: collectionView) ?? 0
     }

Sources/Collections/SkeletonCollectionDelegate.swift

@@ -9,7 +9,6 @@
 import UIKit
 
 class SkeletonCollectionDelegate: NSObject {
-    
     weak var originalTableViewDelegate: SkeletonTableViewDelegate?
     weak var originalCollectionViewDelegate: SkeletonCollectionViewDelegate?
     

Sources/Collections/TableViews/SkeletonTableViewProtocols.swift

@@ -15,7 +15,6 @@ public protocol SkeletonTableViewDataSource: UITableViewDataSource {
 }
 
 public extension SkeletonTableViewDataSource {
-    
     func collectionSkeletonView(_ skeletonView: UITableView, numberOfRowsInSection section: Int) -> Int {
         return skeletonView.estimatedNumberOfRows
     }
@@ -30,5 +29,4 @@ public extension SkeletonTableViewDataSource {
     }
 }
 
-public protocol SkeletonTableViewDelegate: UITableViewDelegate {
-}
+public protocol SkeletonTableViewDelegate: UITableViewDelegate { }

Sources/Collections/TableViews/UITableView+CollectionSkeleton.swift

@@ -9,7 +9,6 @@
 import UIKit
 
 extension UITableView: CollectionSkeleton {
-    
     var estimatedNumberOfRows: Int {
         return Int(ceil(frame.height/rowHeight))
     }

Sources/Collections/UIView+CollectionSkeleton.swift

@@ -11,6 +11,7 @@ import UIKit
 extension UIView {
     func addDummyDataSourceIfNeeded() {
         guard let collection = self as? CollectionSkeleton else { return }
+        status = .on
         collection.addDummyDataSource()
         collection.disableUserInteraction()
     }
@@ -22,6 +23,7 @@ extension UIView {
     
     func removeDummyDataSourceIfNeeded(reloadAfter reload: Bool = true) {
         guard let collection = self as? CollectionSkeleton else { return }
+        status = .off
         collection.removeDummyDataSource(reloadAfter: reload)
         collection.enableUserInteraction()
     }

Sources/Debug/SkeletonDebug.swift

@@ -25,7 +25,6 @@ func skeletonLog(_ message: String) {
 }
 
 extension UIView {
-
     public var skeletonDescription: String {
         var description = "<\(type(of: self)): \(Unmanaged.passUnretained(self).toOpaque())"
         let subSkeletons = subviewsSkeletonables

Sources/Extensions/CALayer+Extensions.swift

@@ -31,7 +31,6 @@ extension CAGradientLayer {
 
 // MARK: Skeleton sublayers
 extension CALayer {
-    
     static let skeletonSubLayersName = "SkeletonSubLayersName"
 
     var skeletonSublayers: [CALayer] {
@@ -46,11 +45,7 @@ extension CALayer {
             .setCornerRadius(multilineCornerRadius)
 
         (0..<numberOfSublayers).forEach { index in
-            var width = getLineWidth(index: index, numberOfSublayers: numberOfSublayers, lastLineFillPercent: lastLineFillPercent)
-            if index == numberOfSublayers - 1 && numberOfSublayers != 1 {
-                width = width * CGFloat(lastLineFillPercent) / 100;
-            }
-
+			let width = calculatedWidthForLine(at: index, totalLines: numberOfSublayers, lastLineFillPercent: lastLineFillPercent)
             if let layer = layerBuilder
                 .setIndex(index)
                 .setWidth(width)
@@ -64,17 +59,16 @@ extension CALayer {
         let currentSkeletonSublayers = skeletonSublayers
         let numberOfSublayers = currentSkeletonSublayers.count
         for (index, layer) in currentSkeletonSublayers.enumerated() {
-            let width = getLineWidth(index: index, numberOfSublayers: numberOfSublayers, lastLineFillPercent: lastLineFillPercent)
+			let width = calculatedWidthForLine(at: index, totalLines: numberOfSublayers, lastLineFillPercent: lastLineFillPercent)
             layer.updateLayerFrame(for: index, width: width)
         }
     }
 
-    private func getLineWidth(index: Int, numberOfSublayers: Int, lastLineFillPercent: Int) -> CGFloat {
+	private func calculatedWidthForLine(at index: Int, totalLines: Int, lastLineFillPercent: Int) -> CGFloat {
         var width = bounds.width
-        if index == numberOfSublayers - 1 && numberOfSublayers != 1 {
-            width = width * CGFloat(lastLineFillPercent) / 100;
+        if index == totalLines - 1 && totalLines != 1 {
+            width = width * CGFloat(lastLineFillPercent) / 100
         }
-
         return width
     }
 
@@ -84,8 +78,8 @@ extension CALayer {
     }
 
     private func calculateNumLines(maxLines: Int) -> Int {
-        let spaceRequitedForEachLine = SkeletonAppearance.default.multilineHeight + SkeletonAppearance.default.multilineSpacing
-        var numberOfSublayers = Int(round(CGFloat(bounds.height)/CGFloat(spaceRequitedForEachLine)))
+        let requiredSpaceForEachLine = SkeletonAppearance.default.multilineHeight + SkeletonAppearance.default.multilineSpacing
+        var numberOfSublayers = Int(round(CGFloat(bounds.height)/CGFloat(requiredSpaceForEachLine)))
         if maxLines != 0,  maxLines <= numberOfSublayers { numberOfSublayers = maxLines }
         return numberOfSublayers
     }
@@ -93,7 +87,6 @@ extension CALayer {
 
 // MARK: Animations
 public extension CALayer {
-
     var pulse: CAAnimation {
         let pulseAnimation = CABasicAnimation(keyPath: #keyPath(CALayer.backgroundColor))
         pulseAnimation.fromValue = backgroundColor
@@ -102,6 +95,7 @@ public extension CALayer {
         pulseAnimation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
         pulseAnimation.autoreverses = true
         pulseAnimation.repeatCount = .infinity
+        pulseAnimation.isRemovedOnCompletion = false
         return pulseAnimation
     }
     
@@ -119,15 +113,19 @@ public extension CALayer {
         animGroup.duration = 1.5
         animGroup.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeIn)
         animGroup.repeatCount = .infinity
+        animGroup.isRemovedOnCompletion = false
         
         return animGroup
     }
     
-    func playAnimation(_ anim: SkeletonLayerAnimation, key: String) {
+    func playAnimation(_ anim: SkeletonLayerAnimation, key: String, completion: (() -> Void)? = nil) {
         skeletonSublayers.recursiveSearch(leafBlock: {
+            DispatchQueue.main.async { CATransaction.begin() }
+            DispatchQueue.main.async { CATransaction.setCompletionBlock(completion) }
             add(anim(self), forKey: key)
+            DispatchQueue.main.async { CATransaction.commit() }
         }) {
-            $0.playAnimation(anim, key: key)
+            $0.playAnimation(anim, key: key, completion: completion)
         }
     }
     
@@ -139,3 +137,17 @@ public extension CALayer {
         }
     }
 }
+
+extension CALayer {
+	func setOpacity(from: Int, to: Int, duration: TimeInterval, completion: (() -> Void)?) {
+        DispatchQueue.main.async { CATransaction.begin() }
+		let animation = CABasicAnimation(keyPath: #keyPath(CALayer.opacity))
+		animation.fromValue = from
+		animation.toValue = to
+		animation.duration = duration
+		animation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
+        DispatchQueue.main.async { CATransaction.setCompletionBlock(completion) }
+		add(animation, forKey: "setOpacityAnimation")
+        DispatchQueue.main.async { CATransaction.commit() }
+	}
+}

Sources/Extensions/Int+Whitespaces.swift

@@ -3,7 +3,6 @@
 import Foundation
 
 extension Int {
-    
     var whitespace: String {
         return whitespaces
     }

Sources/Extensions/UIColor+Skeleton.swift

@@ -4,7 +4,6 @@ import UIKit
 
 // codebeat:disable[TOO_MANY_IVARS]
 extension UIColor {
-    
     convenience init(_ hex: UInt) {
         self.init(
             red: CGFloat((hex & 0xFF0000) >> 16) / 255.0,

Sources/Extensions/UIView+Extension.swift

@@ -10,12 +10,13 @@ enum ViewAssociatedKeys {
     static var flowDelegate = "flowDelegate"
     static var isSkeletonAnimated = "isSkeletonAnimated"
     static var viewState = "viewState"
+    static var labelViewState = "labelViewState"
+    static var imageViewState = "imageViewState"
     static var currentSkeletonConfig = "currentSkeletonConfig"
 }
 // codebeat:enable[TOO_MANY_IVARS]
 
 extension UIView {
-
     enum Status {
         case on
         case off
@@ -41,7 +42,7 @@ extension UIView {
         set { ao_set(newValue ?? .off, pkey: &ViewAssociatedKeys.status) }
     }
 
-    var skeletonIsAnimated: Bool! {
+    var isSkeletonAnimated: Bool! {
         get { return ao_get(pkey: &ViewAssociatedKeys.isSkeletonAnimated) as? Bool ?? false }
         set { ao_set(newValue ?? false, pkey: &ViewAssociatedKeys.isSkeletonAnimated) }
     }

Sources/Extensions/UIView+Frame.swift

@@ -10,7 +10,6 @@ import UIKit
 
 // MARK: Frame
 extension UIView {
-    
     var maxBoundsEstimated: CGRect {
         if let parentStackView = (superview as? UIStackView) {
             var origin: CGPoint = .zero

Sources/Extensions/UIView+IBInspectable.swift

@@ -3,7 +3,6 @@
 import UIKit
 
 public extension UIView {
-    
     @IBInspectable
     var isSkeletonable: Bool {
         get { return skeletonable }
@@ -14,7 +13,7 @@ public extension UIView {
         return status == .on || (subviewsSkeletonables.first(where: { $0.isSkeletonActive }) != nil)
     }
 
-    fileprivate var skeletonable: Bool! {
+    private var skeletonable: Bool! {
         get { return ao_get(pkey: &ViewAssociatedKeys.skeletonable) as? Bool ?? false }
         set { ao_set(newValue ?? false, pkey: &ViewAssociatedKeys.skeletonable) }
     }

Sources/Extensions/UIView+UIApplicationDelegate.swift

@@ -9,16 +9,17 @@
 import UIKit
 
 extension UIView {
-    
     enum Constants {
         static let becomeActiveNotification = UIApplication.didBecomeActiveNotification
         static let enterForegroundNotification = UIApplication.didEnterBackgroundNotification
+        static let willTerminateNotification = UIApplication.willTerminateNotification
         static let needAnimatedSkeletonKey = "needAnimateSkeleton"
     }
     
     func addAppNotificationsObservers() {
         NotificationCenter.default.addObserver(self, selector: #selector(appDidBecomeActive), name: Constants.becomeActiveNotification, object: nil)
         NotificationCenter.default.addObserver(self, selector: #selector(appDidEnterBackground), name: Constants.enterForegroundNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(willTerminateNotification), name: Constants.enterForegroundNotification, object: nil)
     }
     
     func removeAppNoticationsObserver() {
@@ -33,6 +34,10 @@ extension UIView {
     }
     
     @objc func appDidEnterBackground() {
-        UserDefaults.standard.set((isSkeletonActive && skeletonIsAnimated), forKey: Constants.needAnimatedSkeletonKey)
+        UserDefaults.standard.set((isSkeletonActive && isSkeletonAnimated), forKey: Constants.needAnimatedSkeletonKey)
+    }
+    
+    @objc func willTerminateNotification() {
+        UserDefaults.standard.set(false, forKey: Constants.needAnimatedSkeletonKey)
     }
 }

Sources/Helpers/AssociationPolicy.swift

@@ -20,7 +20,6 @@ protocol AssociatedObjects: class { }
 
 // transparent wrappers
 extension AssociatedObjects {
-
     /// wrapper around `objc_getAssociatedObject`
     func ao_get(pkey: UnsafeRawPointer) -> Any? {
         return objc_getAssociatedObject(self, pkey)

Sources/Helpers/PrepareForSkeletonProtocol.swift

@@ -8,26 +8,39 @@
 
 import UIKit
 
-protocol PrepareForSkeleton {
-    func prepareViewForSkeleton() 
+extension UIView {
+    @objc func prepareViewForSkeleton() {
+        startTransition { [weak self] in
+            self?.backgroundColor = .clear
+        }
+    }
 }
 
-extension UILabel: PrepareForSkeleton {
-    func prepareViewForSkeleton() {
-        text = " "
+extension UILabel {
+    override func prepareViewForSkeleton() {
+        backgroundColor = .clear
         resignFirstResponder()
+        startTransition { [weak self] in
+            self?.textColor = .clear
+        }
     }
 }
 
-extension UITextView: PrepareForSkeleton {
-    func prepareViewForSkeleton() {
-        text = " "
+extension UITextView {
+    override func prepareViewForSkeleton() {
+        backgroundColor = .clear
         resignFirstResponder()
+        startTransition { [weak self] in
+            self?.textColor = .clear
+        }
     }
 }
 
-extension UIImageView: PrepareForSkeleton {
-    func prepareViewForSkeleton() {
-        image = nil
+extension UIImageView {
+    override func prepareViewForSkeleton() {
+        backgroundColor = .clear
+        startTransition { [weak self] in
+            self?.image = nil
+        }
     }
 }

Sources/Helpers/Swizzling.swift

@@ -0,0 +1,27 @@
+// Copyright © 2019 SkeletonView. All rights reserved.
+
+import Foundation
+
+extension DispatchQueue {
+    private static var _onceTracker = [String]()
+    
+    class func once(token: String, block:()->Void) {
+        objc_sync_enter(self); defer { objc_sync_exit(self) }
+        guard !_onceTracker.contains(token) else { return }
+        
+        _onceTracker.append(token)
+        block()
+    }
+}
+
+func swizzle(selector originalSelector: Selector, with swizzledSelector: Selector, inClass: AnyClass, usingClass: AnyClass) {
+    guard let originalMethod = class_getInstanceMethod(inClass, originalSelector),
+        let swizzledMethod = class_getInstanceMethod(usingClass, swizzledSelector)
+        else { return }
+    
+    if (class_addMethod(inClass, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod))) {
+        class_replaceMethod(inClass, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod))
+    } else {
+        method_exchangeImplementations(originalMethod, swizzledMethod)
+    }
+}

Sources/Multilines/UITextView+Multiline.swift

@@ -3,7 +3,6 @@
 import UIKit
 
 public extension UITextView {
-
     @IBInspectable
     var lastLineFillPercent: Int {
         get { return lastLineFillingPercent }

Sources/Recoverable/Recoverable.swift

@@ -9,13 +9,11 @@
 import UIKit
 
 protocol Recoverable {
-    var viewState: RecoverableViewState? { get set }
     func saveViewState()
     func recoverViewState(forced: Bool)
 }
 
 extension UIView: Recoverable {
-
     var viewState: RecoverableViewState? {
         get { return ao_get(pkey: &ViewAssociatedKeys.viewState) as? RecoverableViewState }
         set { ao_setOptional(newValue, pkey: &ViewAssociatedKeys.viewState) }
@@ -28,47 +26,72 @@ extension UIView: Recoverable {
     @objc func recoverViewState(forced: Bool) {
         guard let safeViewState = viewState else { return }
         
-        layer.cornerRadius = safeViewState.cornerRadius
-        layer.masksToBounds = safeViewState.clipToBounds
-        
-        if safeViewState.backgroundColor != backgroundColor || forced {
-            backgroundColor = safeViewState.backgroundColor
+        startTransition { [weak self] in
+            self?.layer.cornerRadius = safeViewState.cornerRadius
+            self?.layer.masksToBounds = safeViewState.clipToBounds
+            
+            if safeViewState.backgroundColor != self?.backgroundColor || forced {
+                self?.backgroundColor = safeViewState.backgroundColor
+            }
         }
     }
 }
 
-extension UILabel {
+extension UILabel{
+    var labelState: RecoverableTextViewState? {
+        get { return ao_get(pkey: &ViewAssociatedKeys.labelViewState) as? RecoverableTextViewState }
+        set { ao_setOptional(newValue, pkey: &ViewAssociatedKeys.labelViewState) }
+    }
+    
     override func saveViewState() {
         super.saveViewState()
-        viewState?.text = text
+        labelState = RecoverableTextViewState(view: self)
     }
     
     override func recoverViewState(forced: Bool) {
         super.recoverViewState(forced: forced)
-        text = text == " " || forced ? viewState?.text : text
+        startTransition { [weak self] in
+            self?.textColor = self?.labelState?.textColor
+            self?.text = self?.labelState?.text
+        }
     }
 }
 
-extension UITextView {
+extension UITextView{
+    var textState: RecoverableTextViewState? {
+        get { return ao_get(pkey: &ViewAssociatedKeys.labelViewState) as? RecoverableTextViewState }
+        set { ao_setOptional(newValue, pkey: &ViewAssociatedKeys.labelViewState) }
+    }
+    
     override func saveViewState() {
         super.saveViewState()
-        viewState?.text = text
+        textState = RecoverableTextViewState(view: self)
     }
     
     override func recoverViewState(forced: Bool) {
         super.recoverViewState(forced: forced)
-        text = text == " " || forced ? viewState?.text : text
+        startTransition { [weak self] in
+            self?.textColor = self?.textState?.textColor
+            self?.text = self?.textState?.text
+        }
     }
 }
 
 extension UIImageView {
+    var imageState: RecoverableImageViewState? {
+        get { return ao_get(pkey: &ViewAssociatedKeys.imageViewState) as? RecoverableImageViewState }
+        set { ao_setOptional(newValue, pkey: &ViewAssociatedKeys.imageViewState) }
+    }
+    
     override func saveViewState() {
         super.saveViewState()
-        viewState?.image = image
+        imageState = RecoverableImageViewState(view: self)
     }
     
     override func recoverViewState(forced: Bool) {
         super.recoverViewState(forced: forced)
-        image = image == nil || forced ? viewState?.image : image
+        startTransition { [weak self] in
+            self?.image = self?.image == nil || forced ? self?.imageState?.image : self?.image
+        }
     }
 }

Sources/Recoverable/RecoverableViewState.swift

@@ -13,17 +13,32 @@ struct RecoverableViewState {
     var cornerRadius: CGFloat
     var clipToBounds: Bool
     
-    // UI text
-    var text: String?
-    
-    // UI image
-    var image: UIImage?
-}
-
-extension RecoverableViewState {
     init(view: UIView) {
         self.backgroundColor = view.backgroundColor
         self.clipToBounds = view.layer.masksToBounds
         self.cornerRadius = view.layer.cornerRadius
     }
 }
+
+struct RecoverableTextViewState {
+    var text: String?
+    var textColor: UIColor?
+    
+    init(view: UILabel) {
+        self.textColor = view.textColor
+        self.text = view.text
+    }
+    
+    init(view: UITextView) {
+        self.textColor = view.textColor
+        self.text = view.text
+    }
+}
+
+struct RecoverableImageViewState {
+    var image: UIImage?
+    
+    init(view: UIImageView) {
+        self.image = view.image
+    }
+}

Sources/SkeletonAnimationBuilder.swift

@@ -60,9 +60,7 @@ public enum GradientDirection {
 }
 
 public class SkeletonAnimationBuilder {
-    
-    public init() {
-    }
+    public init() { }
     
     public func makeSlidingAnimation(withDirection direction: GradientDirection, duration: CFTimeInterval = 1.5) -> SkeletonLayerAnimation {
         return { layer in
@@ -80,6 +78,7 @@ public class SkeletonAnimationBuilder {
             animGroup.duration = duration
             animGroup.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeIn)
             animGroup.repeatCount = .infinity
+            animGroup.isRemovedOnCompletion = false
             
             return animGroup
         }

Sources/SkeletonConfig.swift

@@ -6,26 +6,35 @@ import UIKit
 struct SkeletonConfig {
     /// Type of skeleton layer
     let type: SkeletonType
+    
     /// Colors used in skeleton layer
     let colors: [UIColor]
+    
     /// If type is gradient, which gradient direction
     let gradientDirection: GradientDirection?
+    
     /// Specify if skeleton is animated or not
     let animated: Bool
+    
     /// Used to execute a custom animation
     let animation: SkeletonLayerAnimation?
-
+    
+    ///  Transition style
+    var transition: SkeletonTransitionStyle
+    
     init(
-            type: SkeletonType,
-            colors: [UIColor],
-            gradientDirection: GradientDirection? = nil,
-            animated: Bool = false,
-            animation: SkeletonLayerAnimation? = nil
-    ) {
+        type: SkeletonType,
+        colors: [UIColor],
+        gradientDirection: GradientDirection? = nil,
+        animated: Bool = false,
+        animation: SkeletonLayerAnimation? = nil,
+        transition: SkeletonTransitionStyle = .none
+        ) {
         self.type = type
         self.colors = colors
         self.gradientDirection = gradientDirection
         self.animated = animated
         self.animation = animation
+        self.transition = transition
     }
 }

Sources/SkeletonFlow.swift

@@ -3,43 +3,42 @@
 import UIKit
 
 protocol SkeletonFlowDelegate {
-    func willBeginShowingSkeletons(withRootView rootView: UIView)
-    func didShowSkeletons(withRootView rootView: UIView)
-    func willBeginUpdatingSkeletons(withRootView rootView: UIView)
-    func didUpdateSkeletons(withRootView rootView: UIView)
-    func willBeginLayingSkeletonsIfNeeded(withRootView: UIView)
-    func didLayoutSkeletonsIfNeeded(withRootView: UIView)
-    func willBeginHidingSkeletons(withRootView rootView: UIView)
-    func didHideSkeletons(withRootView rootView: UIView)
+    func willBeginShowingSkeletons(rootView: UIView)
+    func didShowSkeletons(rootView: UIView)
+    func willBeginUpdatingSkeletons(rootView: UIView)
+    func didUpdateSkeletons(rootView: UIView)
+    func willBeginLayingSkeletonsIfNeeded(rootView: UIView)
+    func didLayoutSkeletonsIfNeeded(rootView: UIView)
+    func willBeginHidingSkeletons(rootView: UIView)
+    func didHideSkeletons(rootView: UIView)
 }
 
 class SkeletonFlowHandler: SkeletonFlowDelegate {
-
-    func willBeginShowingSkeletons(withRootView rootView: UIView) {
+    func willBeginShowingSkeletons(rootView: UIView) {
         rootView.addAppNotificationsObservers()
     }
 
-    func didShowSkeletons(withRootView rootView: UIView) {
+    func didShowSkeletons(rootView: UIView) {
         printSkeletonHierarchy(in: rootView)
     }
     
-    func willBeginUpdatingSkeletons(withRootView rootView: UIView) {
+    func willBeginUpdatingSkeletons(rootView: UIView) {
     }
 
-    func didUpdateSkeletons(withRootView rootView: UIView) {
+    func didUpdateSkeletons(rootView: UIView) {
     }
 
-    func willBeginLayingSkeletonsIfNeeded(withRootView: UIView) {
+    func willBeginLayingSkeletonsIfNeeded(rootView: UIView) {
     }
 
-    func didLayoutSkeletonsIfNeeded(withRootView: UIView) {
+    func didLayoutSkeletonsIfNeeded(rootView: UIView) {
     }
 
-    func willBeginHidingSkeletons(withRootView rootView: UIView) {
+    func willBeginHidingSkeletons(rootView: UIView) {
         rootView.removeAppNoticationsObserver()
     }
 
-    func didHideSkeletons(withRootView rootView: UIView) {
+    func didHideSkeletons(rootView: UIView) {
         rootView.flowDelegate = nil
     }
 }

Sources/SkeletonGradient.swift

@@ -9,8 +9,7 @@
 import UIKit
 
 public struct SkeletonGradient {
-    
-    private var gradientColors: [UIColor]
+    private let gradientColors: [UIColor]
     
     public var colors: [UIColor] {
         return gradientColors

Sources/SkeletonLayer.swift

@@ -34,7 +34,6 @@ public enum SkeletonType {
 }
 
 struct SkeletonLayer {
-    
     private var maskLayer: CALayer
     private weak var holder: UIView?
     
@@ -46,7 +45,7 @@ struct SkeletonLayer {
         return maskLayer
     }
     
-    init(withType type: SkeletonType, usingColors colors: [UIColor], andSkeletonHolder holder: UIView) {
+    init(type: SkeletonType, colors: [UIColor], skeletonHolder holder: UIView) {
         self.holder = holder
         self.maskLayer = type.layer
         self.maskLayer.anchorPoint = .zero
@@ -57,36 +56,52 @@ struct SkeletonLayer {
     
     func update(usingColors colors: [UIColor]) {
         layoutIfNeeded()
-        self.maskLayer.tint(withColors: colors)
+        maskLayer.tint(withColors: colors)
     }
 
     func layoutIfNeeded() {
-        if let bounds = self.holder?.maxBoundsEstimated {
-            self.maskLayer.bounds = bounds
+        if let bounds = holder?.maxBoundsEstimated {
+            maskLayer.bounds = bounds
         }
         updateMultilinesIfNeeded()
     }
     
-    func removeLayer() {
-        maskLayer.removeFromSuperlayer()
+    func removeLayer(transition: SkeletonTransitionStyle, completion: (() -> Void)? = nil) {
+        switch transition {
+        case .none:
+            maskLayer.removeFromSuperlayer()
+            completion?()
+        case .crossDissolve(let duration):
+			maskLayer.setOpacity(from: 1, to: 0, duration: duration) {
+				self.maskLayer.removeFromSuperlayer()
+				completion?()
+			}
+        }
     }
-    
+
+    /// Returns a multiLineViewHolder only if the current holder implements the `ContainsMultilineText` protocol,
+    /// and actually displays multiple lines of text.
+    private var multiLineViewHolder: ContainsMultilineText? {
+        guard let multiLineView = holder as? ContainsMultilineText,
+            multiLineView.numLines != 1 else { return nil }
+        return multiLineView
+    }
+
     func addMultilinesIfNeeded() {
-        guard let multiLineView = holder as? ContainsMultilineText else { return }
+        guard let multiLineView = multiLineViewHolder else { return }
         maskLayer.addMultilinesLayers(lines: multiLineView.numLines, type: type, lastLineFillPercent: multiLineView.lastLineFillingPercent, multilineCornerRadius: multiLineView.multilineCornerRadius)
     }
 
     func updateMultilinesIfNeeded() {
-        guard let multiLineView = holder as? ContainsMultilineText else { return }
+        guard let multiLineView = multiLineViewHolder else { return }
         maskLayer.updateMultilinesLayers(lastLineFillPercent: multiLineView.lastLineFillingPercent)
     }
 }
 
 extension SkeletonLayer {
-
-    func start(_ anim: SkeletonLayerAnimation? = nil) {
+    func start(_ anim: SkeletonLayerAnimation? = nil, completion: (() -> Void)? = nil) {
         let animation = anim ?? type.layerAnimation
-        contentLayer.playAnimation(animation, key: "skeletonAnimation")
+        contentLayer.playAnimation(animation, key: "skeletonAnimation", completion: completion)
     }
     
     func stopAnimation() {

Sources/SkeletonView.swift

@@ -3,67 +3,89 @@
 import UIKit
 
 public extension UIView {
-    
-    func showSkeleton(usingColor color: UIColor = SkeletonAppearance.default.tintColor) {
-        let config: SkeletonConfig = SkeletonConfig(type: .solid, colors: [color])
+    /// Shows the skeleton without animation using the view that calls this method as root view.
+    ///
+    /// - Parameters:
+    ///   - color: The color of the skeleton. Defaults to `SkeletonAppearance.default.tintColor`.
+    ///   - transition: The style of the transition when the skeleton appears. Defaults to `.none`.
+    func showSkeleton(usingColor color: UIColor = SkeletonAppearance.default.tintColor, transition: SkeletonTransitionStyle = .none) {
+        let config = SkeletonConfig(type: .solid, colors: [color], transition: transition)
         showSkeleton(skeletonConfig: config)
     }
     
-    func showGradientSkeleton(usingGradient gradient: SkeletonGradient = SkeletonAppearance.default.gradient) {
-        let config: SkeletonConfig = SkeletonConfig(type: .gradient, colors: gradient.colors)
+    /// Shows the gradient skeleton without animation using the view that calls this method as root view.
+    ///
+    /// - Parameters:
+    ///   - gradient: The gradient of the skeleton. Defaults to `SkeletonAppearance.default.gradient`.
+    ///   - transition: The style of the transition when the skeleton appears. Defaults to `.none`.
+    func showGradientSkeleton(usingGradient gradient: SkeletonGradient = SkeletonAppearance.default.gradient, transition: SkeletonTransitionStyle = .none) {
+        let config = SkeletonConfig(type: .gradient, colors: gradient.colors, transition: transition)
         showSkeleton(skeletonConfig: config)
     }
     
-    func showAnimatedSkeleton(usingColor color: UIColor = SkeletonAppearance.default.tintColor, animation: SkeletonLayerAnimation? = nil) {
-        let config: SkeletonConfig = SkeletonConfig(type: .solid, colors: [color], animated: true, animation: animation)
+    /// Shows the animated skeleton using the view that calls this method as root view.
+    ///
+    /// If animation is nil, sliding animation will be used, with direction left to right.
+    ///
+    /// - Parameters:
+    ///   - color: The color of skeleton. Defaults to `SkeletonAppearance.default.tintColor`.
+    ///   - animation: The animation of the skeleton. Defaults to `nil`.
+    ///   - transition: The style of the transition when the skeleton appears. Defaults to `.none`.
+    func showAnimatedSkeleton(usingColor color: UIColor = SkeletonAppearance.default.tintColor, animation: SkeletonLayerAnimation? = nil, transition: SkeletonTransitionStyle = .none) {
+        let config = SkeletonConfig(type: .solid, colors: [color], animated: true, animation: animation, transition: transition)
         showSkeleton(skeletonConfig: config)
     }
     
-    func showAnimatedGradientSkeleton(usingGradient gradient: SkeletonGradient = SkeletonAppearance.default.gradient, animation: SkeletonLayerAnimation? = nil) {
-        let config: SkeletonConfig = SkeletonConfig(type: .gradient, colors: gradient.colors, animated: true, animation: animation)
+    /// Shows the gradient skeleton without animation using the view that calls this method as root view.
+    ///
+    /// If animation is nil, sliding animation will be used, with direction left to right.
+    ///
+    /// - Parameters:
+    ///   - gradient: The gradient of the skeleton. Defaults to `SkeletonAppearance.default.gradient`.
+    ///   - animation: The animation of the skeleton. Defaults to `nil`.
+    ///   - transition: The style of the transition when the skeleton appears. Defaults to `.none`.
+    func showAnimatedGradientSkeleton(usingGradient gradient: SkeletonGradient = SkeletonAppearance.default.gradient, animation: SkeletonLayerAnimation? = nil, transition: SkeletonTransitionStyle = .none) {
+        let config = SkeletonConfig(type: .gradient, colors: gradient.colors, animated: true, animation: animation, transition: transition)
         showSkeleton(skeletonConfig: config)
     }
 
     func updateSkeleton(usingColor color: UIColor = SkeletonAppearance.default.tintColor) {
-        let config: SkeletonConfig = SkeletonConfig(type: .solid, colors: [color])
+        let config = SkeletonConfig(type: .solid, colors: [color])
         updateSkeleton(skeletonConfig: config)
     }
 
     func updateGradientSkeleton(usingGradient gradient: SkeletonGradient = SkeletonAppearance.default.gradient) {
-        let config: SkeletonConfig = SkeletonConfig(type: .gradient, colors: gradient.colors)
+        let config = SkeletonConfig(type: .gradient, colors: gradient.colors)
         updateSkeleton(skeletonConfig: config)
     }
 
     func updateAnimatedSkeleton(usingColor color: UIColor = SkeletonAppearance.default.tintColor, animation: SkeletonLayerAnimation? = nil) {
-        let config: SkeletonConfig = SkeletonConfig(type: .solid, colors: [color], animated: true, animation: animation)
+        let config = SkeletonConfig(type: .solid, colors: [color], animated: true, animation: animation)
         updateSkeleton(skeletonConfig: config)
     }
 
     func updateAnimatedGradientSkeleton(usingGradient gradient: SkeletonGradient = SkeletonAppearance.default.gradient, animation: SkeletonLayerAnimation? = nil) {
-        let config: SkeletonConfig = SkeletonConfig(type: .gradient, colors: gradient.colors, animated: true, animation: animation)
+        let config = SkeletonConfig(type: .gradient, colors: gradient.colors, animated: true, animation: animation)
         updateSkeleton(skeletonConfig: config)
     }
 
     func layoutSkeletonIfNeeded() {
-        guard let flowDelegate = flowDelegate else { return }
-        flowDelegate.willBeginLayingSkeletonsIfNeeded(withRootView: self)
+        flowDelegate?.willBeginLayingSkeletonsIfNeeded(rootView: self)
         recursiveLayoutSkeletonIfNeeded(root: self)
     }
     
-    func hideSkeleton(reloadDataAfter reload: Bool = true) {
-        flowDelegate?.willBeginHidingSkeletons(withRootView: self)
-        recursiveHideSkeleton(reloadDataAfter: reload, root: self)
+    func hideSkeleton(reloadDataAfter reload: Bool = true, transition: SkeletonTransitionStyle = .none) {
+        flowDelegate?.willBeginHidingSkeletons(rootView: self)
+        recursiveHideSkeleton(reloadDataAfter: reload, transition: transition, root: self)
     }
     
     func startSkeletonAnimation(_ anim: SkeletonLayerAnimation? = nil) {
-        skeletonIsAnimated = true
         subviewsSkeletonables.recursiveSearch(leafBlock: startSkeletonLayerAnimationBlock(anim)) { subview in
             subview.startSkeletonAnimation(anim)
         }
     }
 
     func stopSkeletonAnimation() {
-        skeletonIsAnimated = false
         subviewsSkeletonables.recursiveSearch(leafBlock: stopSkeletonLayerAnimationBlock) { subview in
             subview.stopSkeletonAnimation()
         }
@@ -71,19 +93,22 @@ public extension UIView {
 }
 
 extension UIView {
+    @objc func skeletonLayoutSubviews() {
+        guard isSkeletonActive else { return }
+        layoutSkeletonIfNeeded()
+    }
     
     func showSkeleton(skeletonConfig config: SkeletonConfig) {
-        skeletonIsAnimated = config.animated
+        isSkeletonAnimated = config.animated
         flowDelegate = SkeletonFlowHandler()
-        flowDelegate?.willBeginShowingSkeletons(withRootView: self)
+        flowDelegate?.willBeginShowingSkeletons(rootView: self)
         recursiveShowSkeleton(skeletonConfig: config, root: self)
     }
 
-    fileprivate func recursiveShowSkeleton(skeletonConfig config: SkeletonConfig, root: UIView? = nil) {
-        layoutIfNeeded()
-
+    private func recursiveShowSkeleton(skeletonConfig config: SkeletonConfig, root: UIView? = nil) {
+        guard !isSkeletonActive else { return }
         currentSkeletonConfig = config
-
+        swizzleLayoutSubviews()
         addDummyDataSourceIfNeeded()
         subviewsSkeletonables.recursiveSearch(leafBlock: {
             showSkeletonIfNotActive(skeletonConfig: config)
@@ -92,98 +117,109 @@ extension UIView {
         }
 
         if let root = root {
-            flowDelegate?.didShowSkeletons(withRootView: root)
+            flowDelegate?.didShowSkeletons(rootView: root)
         }
     }
 
-    fileprivate func showSkeletonIfNotActive(skeletonConfig config: SkeletonConfig) {
-        guard !self.isSkeletonActive else { return }
-        self.isUserInteractionEnabled = false
-        self.saveViewState()
-        (self as? PrepareForSkeleton)?.prepareViewForSkeleton()
-        self.addSkeletonLayer(skeletonConfig: config)
+    private func showSkeletonIfNotActive(skeletonConfig config: SkeletonConfig) {
+        guard !isSkeletonActive else { return }
+        isUserInteractionEnabled = false
+        saveViewState()
+        prepareViewForSkeleton()
+        addSkeletonLayer(skeletonConfig: config)
     }
 
     func updateSkeleton(skeletonConfig config: SkeletonConfig) {
-        guard let flowDelegate = flowDelegate else { return }
-        skeletonIsAnimated = config.animated
-        flowDelegate.willBeginUpdatingSkeletons(withRootView: self)
+        isSkeletonAnimated = config.animated
+        flowDelegate?.willBeginUpdatingSkeletons(rootView: self)
         recursiveUpdateSkeleton(skeletonConfig: config, root: self)
     }
 
-    fileprivate func recursiveUpdateSkeleton(skeletonConfig config: SkeletonConfig, root: UIView? = nil) {
-        layoutIfNeeded()
-
+    private func recursiveUpdateSkeleton(skeletonConfig config: SkeletonConfig, root: UIView? = nil) {
+        guard isSkeletonActive else { return }
         currentSkeletonConfig = config
-
         updateDummyDataSourceIfNeeded()
         subviewsSkeletonables.recursiveSearch(leafBlock: {
-            guard isSkeletonActive else { return }
-
             if skeletonLayer?.type != config.type {
-                hideSkeleton()
-            }
-
-            if isSkeletonActive {
-                updateSkeletonLayer(skeletonConfig: config)
+                removeSkeletonLayer()
+                addSkeletonLayer(skeletonConfig: config)
             } else {
-                showSkeletonIfNotActive(skeletonConfig: config)
+                updateSkeletonLayer(skeletonConfig: config)
             }
         }) { subview in
             subview.recursiveUpdateSkeleton(skeletonConfig: config)
         }
 
         if let root = root {
-            flowDelegate?.didUpdateSkeletons(withRootView: root)
+            flowDelegate?.didUpdateSkeletons(rootView: root)
         }
     }
 
-    fileprivate func recursiveLayoutSkeletonIfNeeded(root: UIView? = nil) {
-        layoutIfNeeded()
-
+    private func recursiveLayoutSkeletonIfNeeded(root: UIView? = nil) {
         subviewsSkeletonables.recursiveSearch(leafBlock: {
+            guard isSkeletonable, isSkeletonActive else { return }
             layoutSkeletonLayerIfNeeded()
+            if let config = currentSkeletonConfig, config.animated, !isSkeletonAnimated {
+                startSkeletonAnimation(config.animation)
+            }
         }) { subview in
             subview.recursiveLayoutSkeletonIfNeeded()
         }
 
         if let root = root {
-            flowDelegate?.didLayoutSkeletonsIfNeeded(withRootView: root)
+            flowDelegate?.didLayoutSkeletonsIfNeeded(rootView: root)
         }
     }
 
-    fileprivate func recursiveHideSkeleton(reloadDataAfter reload: Bool, root: UIView? = nil) {
+    private func recursiveHideSkeleton(reloadDataAfter reload: Bool, transition: SkeletonTransitionStyle, root: UIView? = nil) {
+        guard isSkeletonActive else { return }
         removeDummyDataSourceIfNeeded(reloadAfter: reload)
+        currentSkeletonConfig?.transition = transition
         isUserInteractionEnabled = true
         subviewsSkeletonables.recursiveSearch(leafBlock: {
             recoverViewState(forced: false)
             removeSkeletonLayer()
         }) { subview in
-            subview.recursiveHideSkeleton(reloadDataAfter: reload)
+            subview.recursiveHideSkeleton(reloadDataAfter: reload, transition: transition)
         }
 
         if let root = root {
-            flowDelegate?.didHideSkeletons(withRootView: root)
+            flowDelegate?.didHideSkeletons(rootView: root)
         }
     }
     
-    fileprivate func startSkeletonLayerAnimationBlock(_ anim: SkeletonLayerAnimation? = nil) -> VoidBlock {
+    private func startSkeletonLayerAnimationBlock(_ anim: SkeletonLayerAnimation? = nil) -> VoidBlock {
         return {
+            self.isSkeletonAnimated = true
             guard let layer = self.skeletonLayer else { return }
-            layer.start(anim)
+            layer.start(anim) { [weak self] in
+                self?.isSkeletonAnimated = false
+            }
         }
     }
     
-    fileprivate var stopSkeletonLayerAnimationBlock: VoidBlock {
+    private var stopSkeletonLayerAnimationBlock: VoidBlock {
         return {
+            self.isSkeletonAnimated = false
             guard let layer = self.skeletonLayer else { return }
             layer.stopAnimation()
         }
     }
+    
+    private func swizzleLayoutSubviews() {
+        DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
+            DispatchQueue.once(token: "UIView.SkeletonView.swizzle") {
+                swizzle(selector: #selector(UIView.layoutSubviews),
+                        with: #selector(UIView.skeletonLayoutSubviews),
+                        inClass: UIView.self,
+                        usingClass: UIView.self)
+                self.layoutSkeletonIfNeeded()
+            }
+        }
+    }
 }
 
 extension UIView {
-    
     func addSkeletonLayer(skeletonConfig config: SkeletonConfig) {
         guard let skeletonLayer = SkeletonLayerBuilder()
             .setSkeletonType(config.type)
@@ -193,16 +229,24 @@ extension UIView {
             else { return }
 
         self.skeletonLayer = skeletonLayer
-        layer.insertSublayer(skeletonLayer.contentLayer, at: UInt32.max)
-        if config.animated { skeletonLayer.start(config.animation) }
+        layer.insertSublayer(skeletonLayer,
+                             at: UInt32.max,
+                             transition: config.transition) { [weak self] in
+                                if config.animated {
+                                    self?.startSkeletonAnimation(config.animation)
+                                }
+        }
         status = .on
     }
     
     func updateSkeletonLayer(skeletonConfig config: SkeletonConfig) {
         guard let skeletonLayer = skeletonLayer else { return }
         skeletonLayer.update(usingColors: config.colors)
-        if config.animated { skeletonLayer.start(config.animation) }
-        else { skeletonLayer.stopAnimation() }
+        if config.animated {
+            startSkeletonAnimation(config.animation)
+        } else {
+            skeletonLayer.stopAnimation()
+        }
     }
 
     func layoutSkeletonLayerIfNeeded() {
@@ -212,12 +256,13 @@ extension UIView {
     
     func removeSkeletonLayer() {
         guard isSkeletonActive,
-            let skeletonLayer = skeletonLayer else { return }
+            let skeletonLayer = skeletonLayer,
+            let transitionStyle = currentSkeletonConfig?.transition else { return }
         skeletonLayer.stopAnimation()
-        skeletonLayer.removeLayer()
-        self.skeletonLayer = nil
-        status = .off
-        currentSkeletonConfig = nil
+        skeletonLayer.removeLayer(transition: transitionStyle) {
+            self.skeletonLayer = nil
+            self.status = .off
+            self.currentSkeletonConfig = nil
+        }
     }
 }
-

Sources/SubviewsSkeletonables.swift

@@ -13,35 +13,30 @@ extension UIView {
 }
 
 extension UITableView {
-
     override var subviewsToSkeleton: [UIView] {
         return visibleCells
     }
 }
 
 extension UITableViewCell {
-
     override var subviewsToSkeleton: [UIView] {
         return contentView.subviews
     }
 }
 
 extension UICollectionView {
-
     override var subviewsToSkeleton: [UIView] {
         return subviews
     }
 }
 
 extension UICollectionViewCell {
-
     override var subviewsToSkeleton: [UIView] {
         return contentView.subviews
     }
 }
 
 extension UIStackView {
-
     override var subviewsToSkeleton: [UIView] {
         return arrangedSubviews
     }

Sources/Transitions/SkeletonTransitionStyle.swift

@@ -0,0 +1,8 @@
+// Copyright © 2019 SkeletonView. All rights reserved.
+
+import UIKit
+
+public enum SkeletonTransitionStyle: Equatable {
+    case none
+    case crossDissolve(TimeInterval)
+}

Sources/Transitions/UIView+Transitions.swift

@@ -0,0 +1,35 @@
+// Copyright © 2019 SkeletonView. All rights reserved.
+
+import UIKit
+
+extension CALayer {
+    func insertSublayer(_ layer: SkeletonLayer, at idx: UInt32, transition: SkeletonTransitionStyle, completion: (() -> Void)? = nil) {
+        insertSublayer(layer.contentLayer, at: idx)
+        switch transition {
+        case .none:
+            completion?()
+            break
+        case .crossDissolve(let duration):
+			layer.contentLayer.setOpacity(from: 0, to: 1, duration: duration, completion: completion)
+        }
+    }
+}
+
+extension UIView {
+    func startTransition(transitionBlock: @escaping () -> Void) {
+        guard let transitionStyle = currentSkeletonConfig?.transition,
+            transitionStyle != .none
+            else {
+                transitionBlock()
+                return
+        }
+        
+        if case let .crossDissolve(duration) = transitionStyle {
+            UIView.transition(with: self,
+                              duration: duration,
+                              options: .transitionCrossDissolve,
+                              animations: transitionBlock,
+                              completion: nil)
+        }
+    }
+}