converted to swift 5

FoldingCell.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = 'FoldingCell'
-  s.version      = '4.0.2'
+  s.version      = '4.0.3'
   s.summary      = 'UITableViewCell with folding animation.'
   s.homepage     = 'https://github.com/Ramotion/folding-cell'
   s.license      = 'MIT'

FoldingCell/FoldingCell.xcodeproj/project.pbxproj

@@ -316,24 +316,24 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0940;
-				LastUpgradeCheck = 0940;
+				LastUpgradeCheck = 1020;
 				ORGANIZATIONNAME = "Alex K.";
 				TargetAttributes = {
 					5A0E1C2C21414940006A0374 = {
 						CreatedOnToolsVersion = 9.4;
-						LastSwiftMigration = 1000;
+						LastSwiftMigration = 1020;
 						ProvisioningStyle = Automatic;
 						TestTargetID = 9D57F31B1EDC7A6F0004599F;
 					};
 					8499D8841D0054A8004B5B37 = {
 						CreatedOnToolsVersion = 7.3.1;
 						DevelopmentTeam = LEAZS7L33U;
-						LastSwiftMigration = 1000;
+						LastSwiftMigration = 1020;
 					};
 					9D57F31B1EDC7A6F0004599F = {
 						CreatedOnToolsVersion = 8.3.2;
 						DevelopmentTeam = 34MUF9YXTA;
-						LastSwiftMigration = 1000;
+						LastSwiftMigration = 1020;
 						ProvisioningStyle = Automatic;
 					};
 					9DAA51531EDDBAD700DFC539 = {
@@ -345,7 +345,7 @@
 			};
 			buildConfigurationList = 847A57FF1C294F750028FB84 /* Build configuration list for PBXProject "FoldingCell" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
@@ -513,7 +513,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.ramotion.FoldingCellDemoTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/FoldingCell-Demo.app/FoldingCell-Demo";
 			};
@@ -536,7 +536,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.ramotion.FoldingCellDemoTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/FoldingCell-Demo.app/FoldingCell-Demo";
 			};
@@ -546,6 +546,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -600,6 +601,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -665,7 +667,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -692,7 +694,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.ramotion.FoldingCell;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -717,7 +719,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -738,7 +740,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "ramotion.com.FoldingCell-Demo";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
 		};

FoldingCell/FoldingCell.xcodeproj/xcshareddata/xcschemes/FoldingCell.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0940"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

FoldingCell/FoldingCell/FoldingCell.swift

@@ -26,6 +26,8 @@ import UIKit
 /// UITableViewCell with folding animation
 open class FoldingCell: UITableViewCell {
     
+    @objc open var isUnfolded = false
+    
     /// UIView is displayed when cell open
     @IBOutlet open var containerView: UIView!
     @IBOutlet open var containerViewTop: NSLayoutConstraint!
@@ -76,7 +78,7 @@ open class FoldingCell: UITableViewCell {
     
     // MARK: configure
     
-    func configureDefaultState() {
+    private func configureDefaultState() {
         
         guard let foregroundViewTop = self.foregroundViewTop,
             let containerViewTop = self.containerViewTop else {
@@ -96,7 +98,7 @@ open class FoldingCell: UITableViewCell {
         contentView.bringSubviewToFront(foregroundView)
     }
     
-    func createAnimationItemView() -> [RotatedView] {
+    private func createAnimationItemView() -> [RotatedView] {
         
         var items = [RotatedView]()
         items.append(foregroundView)
@@ -275,8 +277,6 @@ open class FoldingCell: UITableViewCell {
         return animationView?.alpha == 1 ? true : false
     }
     
-    @objc open var isUnfolded = false
-    
     // MARK: Animations
     
     @objc open func animationDuration(_ itemIndex: NSInteger, type: AnimationType) -> TimeInterval {