Update Navigation-stack.podspec

Add backgroundView property for background image support

.travis.yml

@@ -0,0 +1,6 @@
+osx_image: xcode7.2
+language: objective-c
+
+xcode_project: NavigationStackDemo.xcodeproj
+xcode_scheme: NavigationStack
+xcode_sdk: iphonesimulator

CONTRIBUTING.md

@@ -0,0 +1,33 @@
+# Contributing to a Project
+Now that you’ve found the material for understanding the project, here is how you can take action.
+
+### Create an Issue
+
+If you find a bug in a project you’re using (and you don’t know how to fix it), have trouble following the documentation or have a question about the project – create an issue! There’s nothing to it and whatever issue you’re having, you’re likely not the only one, so others will find your issue helpful, too. For more information on how issues work, check out our Issues guide.
+
+#### Issues Pro Tips
+
+Check existing issues for your issue. Duplicating an issue is slower for both parties so search through open and closed issues to see if what you’re running into has been addressed already.
+Be clear about what your problem is: what was the expected outcome, what happened instead? Detail how someone else can recreate the problem.
+Link to demos recreating the problem on things like JSFiddle or CodePen.
+Include system details like what the browser, library or operating system you’re using and its version.
+Paste error output or logs in your issue or in a Gist. If pasting them in the issue, wrap it in three backticks: ``` so that it renders nicely.
+
+### Pull Request
+
+If you’re able to patch the bug or add the feature yourself – fantastic, make a pull request with the code! Be sure you’ve read any documents on contributing, understand the license and have signed a CLA if required. Once you’ve submitted a pull request the maintainer(s) can compare your branch to the existing one and decide whether or not to incorporate (pull in) your changes.
+
+#### Pull Request Pro Tips
+
+Fork the repository and clone it locally. Connect your local to the original ‘upstream’ repository by adding it as a remote. Pull in changes from ‘upstream’ often so that you stay up to date so that when you submit your pull request, merge conflicts will be less likely. See more detailed instructions here.
+Create a branch for your edits.
+Be clear about what problem is occurring and how someone can recreate that problem or why your feature will help. Then be equally as clear about the steps you took to make your changes.
+It’s best to test. Run your changes against any existing tests if they exist and create new ones when needed. Whether tests exist or not, make sure your changes don’t break the existing project.
+Include screenshots of the before and after if your changes include differences in HTML/CSS. Drag and drop the images into the body of your pull request.
+Contribute in the style of the project to the best of your abilities. This may mean using indents, semi colons or comments differently than you would in your own repository, but makes it easier for the maintainer to merge, others to understand and maintain in the future.
+
+#### Open Pull Requests
+
+Once you’ve opened a pull request a discussion will start around your proposed changes. Other contributors and users may chime in, but ultimately the decision is made by the maintainer(s). You may be asked to make some changes to your pull request, if so, add more commits to your branch and push them – they’ll automatically go into the existing pull request.
+
+If your pull request is merged – great! If it is not, no sweat, it may not be what the project maintainer had in mind, or they were already working on it. This happens, so our recommendation is to take any feedback you’ve received and go forth and pull request again – or create your own open source project.

Navigation-stack.podspec

@@ -0,0 +1,12 @@
+Pod::Spec.new do |s|
+  s.name         = 'Navigation-stack'
+  s.version      = '0.0.3'
+  s.summary      = 'Show list of navigationControllers'
+  s.license      = 'MIT'
+  s.homepage     = 'https://github.com/Ramotion/navigation-stack'
+  s.author       = { 'Juri Vasylenko' => 'juri.v@ramotion.com' }
+  s.ios.deployment_target = '9.0'
+  s.source       = { :git => 'https://github.com/Ramotion/navigation-stack.git', :tag => s.version.to_s }
+  s.source_files  = 'Source/**/*.swift'
+  s.requires_arc = true
+end

NavigationStackDemo.xcodeproj/project.pbxproj

@@ -7,24 +7,32 @@
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@@ -244,6 +207,16 @@
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@@ -393,17 +339,16 @@
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 			buildActionMask = 2147483647;
 			files = (
+				84500F2E1C87045B00B0550E /* NavigationStack.swift in Sources */,
+				84500F201C87044100B0550E /* SecondViewController.swift in Sources */,
+				84500F221C87044500B0550E /* ThirdViewController.swift in Sources */,
 				8444B1051C80238500B53B4E /* NavigationStackDemoTests.swift in Sources */,
-				847B0F881C842ED800E2C54D /* FirstTableViewController.swift in Sources */,
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-		};
-		8444B1071C80238500B53B4E /* Sources */ = {
-			isa = PBXSourcesBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-				8444B1101C80238500B53B4E /* NavigationStackDemoUITests.swift in Sources */,
-				847B0F891C842ED800E2C54D /* FirstTableViewController.swift in Sources */,
+				84500F2C1C87045700B0550E /* CollectionStackViewController.swift in Sources */,
+				84500F281C87045000B0550E /* CollectionViewStackCell.swift in Sources */,
+				842FF8E51C8707DA0030E758 /* FirstTableViewController.swift in Sources */,
+				84500F2A1C87045400B0550E /* CollectionViewStackFlowLayout.swift in Sources */,
+				842FF8E11C8707BD0030E758 /* AppDelegate.swift in Sources */,
+				84500F261C87044B00B0550E /* FifthViewController.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -415,11 +360,6 @@
 			target = 8444B0EB1C80238500B53B4E /* NavigationStackDemo */;
 			targetProxy = 8444B1011C80238500B53B4E /* PBXContainerItemProxy */;
 		};
-		8444B10D1C80238500B53B4E /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			target = 8444B0EB1C80238500B53B4E /* NavigationStackDemo */;
-			targetProxy = 8444B10C1C80238500B53B4E /* PBXContainerItemProxy */;
-		};
 /* End PBXTargetDependency section */
 
 /* Begin PBXVariantGroup section */
@@ -527,6 +467,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
 				INFOPLIST_FILE = NavigationStackDemo/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
@@ -539,6 +480,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
 				INFOPLIST_FILE = NavigationStackDemo/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
@@ -571,30 +513,6 @@
 			};
 			name = Release;
 		};
-		8444B11B1C80238500B53B4E /* Debug */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				INFOPLIST_FILE = NavigationStackDemoUITests/Info.plist;
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				PRODUCT_BUNDLE_IDENTIFIER = com.ramotion.NavigationStackDemoUITests;
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				TEST_TARGET_NAME = NavigationStackDemo;
-				USES_XCTRUNNER = YES;
-			};
-			name = Debug;
-		};
-		8444B11C1C80238500B53B4E /* Release */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				INFOPLIST_FILE = NavigationStackDemoUITests/Info.plist;
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				PRODUCT_BUNDLE_IDENTIFIER = com.ramotion.NavigationStackDemoUITests;
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				TEST_TARGET_NAME = NavigationStackDemo;
-				USES_XCTRUNNER = YES;
-			};
-			name = Release;
-		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
@@ -625,15 +543,6 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		8444B11A1C80238500B53B4E /* Build configuration list for PBXNativeTarget "NavigationStackDemoUITests" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				8444B11B1C80238500B53B4E /* Debug */,
-				8444B11C1C80238500B53B4E /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
 /* End XCConfigurationList section */
 	};
 	rootObject = 8444B0E41C80238500B53B4E /* Project object */;

NavigationStackDemo.xcodeproj/xcshareddata/xcschemes/NavigationStack.xcscheme

@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0720"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "8444B0EB1C80238500B53B4E"
+               BuildableName = "NavigationStackDemo.app"
+               BlueprintName = "NavigationStackDemo"
+               ReferencedContainer = "container:NavigationStackDemo.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "8444B0FF1C80238500B53B4E"
+               BuildableName = "NavigationStackDemoTests.xctest"
+               BlueprintName = "NavigationStackDemoTests"
+               ReferencedContainer = "container:NavigationStackDemo.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "8444B0EB1C80238500B53B4E"
+            BuildableName = "NavigationStackDemo.app"
+            BlueprintName = "NavigationStackDemo"
+            ReferencedContainer = "container:NavigationStackDemo.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "8444B0EB1C80238500B53B4E"
+            BuildableName = "NavigationStackDemo.app"
+            BlueprintName = "NavigationStackDemo"
+            ReferencedContainer = "container:NavigationStackDemo.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "8444B0EB1C80238500B53B4E"
+            BuildableName = "NavigationStackDemo.app"
+            BlueprintName = "NavigationStackDemo"
+            ReferencedContainer = "container:NavigationStackDemo.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

NavigationStackDemo/AppDelegate.swift

@@ -32,6 +32,13 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
   func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
     // Override point for customization after application launch.
+    UIApplication.sharedApplication().statusBarStyle = .LightContent
+    
+    UINavigationBar.appearance().titleTextAttributes = [
+      NSForegroundColorAttributeName : UIColor.whiteColor(),
+      NSFontAttributeName : UIFont(name: "OpenSans-Semibold", size: 16)!
+    ]
+    
     return true
   }
 

NavigationStackDemo/Assets.xcassets/Fifth/ButtonBorder.imageset/Contents.json

@@ -0,0 +1,24 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "ButtonBorder.pdf",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

NavigationStackDemo/Assets.xcassets/Fifth/Contents.json

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

NavigationStackDemo/Assets.xcassets/Fifth/Fifth-Icon-0.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Fifth/Fifth-Icon-1.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Fifth/Fifth-Icon-2.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Fifth/Fifth-Icon-3.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/First/Contents.json

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

NavigationStackDemo/Assets.xcassets/First/icons/Arrow.imageset/Contents.json

@@ -0,0 +1,24 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "Arrow.pdf",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

NavigationStackDemo/Assets.xcassets/First/icons/Contents.json

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

NavigationStackDemo/Assets.xcassets/First/icons/icon-0.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/First/icons/icon-1.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/First/icons/icon-2.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/First/icons/icon-3.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/First/icons/icon-4.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "icon-4.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

NavigationStackDemo/Assets.xcassets/Four/Contents.json

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

NavigationStackDemo/Assets.xcassets/Four/GirlsBig.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Four/NYbg.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Four/faceIcon.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Four/foodIcon.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Second/BridgeImage.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Second/Contents.json

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

NavigationStackDemo/Assets.xcassets/Second/DotsIcon.imageset/Contents.json

@@ -0,0 +1,24 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "DotsIcon.pdf",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

NavigationStackDemo/Assets.xcassets/Second/HeadnImage.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Second/PCImage.imageset/Contents.json

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

NavigationStackDemo/Assets.xcassets/Second/PersonIcon.imageset/Contents.json

@@ -0,0 +1,24 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PersonIcon.pdf",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

NavigationStackDemo/Assets.xcassets/Second/PinIcon.imageset/Contents.json

@@ -0,0 +1,24 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PinIcon.pdf",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

NavigationStackDemo/Assets.xcassets/Second/RamotionBig.imageset/Contents.json

@@ -0,0 +1,24 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "RamotionBig.pdf",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

NavigationStackDemo/Assets.xcassets/Second/backButton.imageset/Contents.json

@@ -0,0 +1,24 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "backButton.pdf",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

NavigationStackDemo/Assets.xcassets/Third/BGmessage.imageset/Contents.json

@@ -0,0 +1,24 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "BGmessage.pdf",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

NavigationStackDemo/Assets.xcassets/Third/Contents.json

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

NavigationStackDemo/Assets.xcassets/Third/girsl.imageset/Contents.json

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

NavigationStackDemo/Base.lproj/LaunchScreen.storyboard

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8150" systemVersion="15A204g" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="9532" systemVersion="15D21" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8122"/>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="9530"/>
     </dependencies>
     <scenes>
         <!--View Controller-->
@@ -15,7 +16,6 @@
                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <animations/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                     </view>
                 </viewController>

NavigationStackDemo/Info.plist

@@ -22,6 +22,10 @@
 	<string>1</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
+	<key>UIAppFonts</key>
+	<array>
+		<string>OpenSans-Semibold.ttf</string>
+	</array>
 	<key>UILaunchStoryboardName</key>
 	<string>LaunchScreen</string>
 	<key>UIMainStoryboardFile</key>
@@ -30,9 +34,13 @@
 	<array>
 		<string>armv7</string>
 	</array>
+	<key>UIStatusBarHidden</key>
+	<false/>
 	<key>UISupportedInterfaceOrientations</key>
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>
 	</array>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<false/>
 </dict>
 </plist>

NavigationStackDemo/ViewControllers/Cells/TableViewCell.swift

@@ -1,15 +0,0 @@
-//
-//  TableViewCell.swift
-//  NavigationStackDemo
-//
-//  Created by Alex K. on 29/02/16.
-//  Copyright © 2016 Alex K. All rights reserved.
-//
-
-import UIKit
-
-class TableViewCell: UITableViewCell {
-  
-  @IBOutlet weak var circleView: UIView!
-  @IBOutlet weak var contantHeight: NSLayoutConstraint!
-}

NavigationStackDemo/ViewControllers/FirstTableViewController.swift

@@ -1,80 +0,0 @@
-//
-//  FirstTableViewController.swift
-//  NavigationStackDemo
-//
-//  Created by Alex K. on 29/02/16.
-//  Copyright © 2016 Alex K. All rights reserved.
-//
-
-import UIKit
-
-// MARK: FirstTableViewController
-
-class FirstTableViewController: UITableViewController {
-  
-  let items = [
-    UIColor(red:0.97, green:0.74, blue:0.58, alpha:1),
-    UIColor(red:0.95, green:0.86, blue:0.58, alpha:1),
-    UIColor(red:0.78, green:0.89, blue:0.58, alpha:1),
-    UIColor(red:0.61, green:0.86, blue:0.87, alpha:1),
-    UIColor(red:0.77, green:0.76, blue:0.92, alpha:1)
-  ]
-  
-  override func viewDidLoad() {
-    super.viewDidLoad()
-    navigationController!.interactivePopGestureRecognizer?.delegate = self
-  }
-
-  override func viewWillAppear(animated: Bool) {
-    super.viewWillAppear(animated)
-    
-    if let navigationController = navigationController {
-      navigationController.navigationBar.barTintColor = UIColor(red:0.93, green:0.93, blue:0.95, alpha:1)
-    }
-  }
-  
-}
-
-// MARK: UIGestureRecognizerDelegate
-
-extension FirstTableViewController: UIGestureRecognizerDelegate {
-  func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
-    
-    if navigationController?.viewControllers.count == 2 {
-      return true
-    }
-    
-    if let navigationController = self.navigationController as? NavigationStack {
-      navigationController.showControllers()
-    }
-    
-    return false
-  }
-}
-
-// MARK: UITableViewDataSource
-
-extension FirstTableViewController {
-  
-  override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-    return items.count
-  }
-  
-  override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
-    return tableView.dequeueReusableCellWithIdentifier(String(TableViewCell), forIndexPath: indexPath)
-  }
-}
-
-// MARK: UITableViewDelegate
-
-extension FirstTableViewController {
-  override func tableView(tableView: UITableView, willDisplayCell
-    cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
-      
-      guard let cell = cell as? TableViewCell else {
-        return
-      }
-      cell.circleView.backgroundColor = items[indexPath.row]
-      cell.contantHeight.constant = CGFloat(arc4random_uniform(150) + 30)
-  }
-}

NavigationStackDemo/ViewControllers/FirstViewController/FirstTableViewController.swift

@@ -0,0 +1,53 @@
+//
+//  FirstTableViewController.swift
+//  NavigationStackDemo
+//
+//  Created by Alex K. on 29/02/16.
+//  Copyright © 2016 Alex K. All rights reserved.
+//
+
+import UIKit
+
+// MARK: FirstTableViewController
+
+class FirstTableViewController: UITableViewController {
+  
+  @IBOutlet var search: UISearchBar!
+  
+  override func viewDidLoad() {
+    super.viewDidLoad()
+    navigationController!.interactivePopGestureRecognizer?.delegate = self
+    
+    navigationItem.titleView = search
+  }
+
+  override func viewWillAppear(animated: Bool) {
+    super.viewWillAppear(animated)
+    
+    if let navigationController = navigationController {
+      navigationController.navigationBar.barTintColor = UIColor(red:0.4, green:0.47, blue:0.62, alpha:1)
+    }
+  }
+  
+  override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
+    performSegueWithIdentifier("push", sender: nil)
+  }
+  
+}
+
+// MARK: UIGestureRecognizerDelegate
+
+extension FirstTableViewController: UIGestureRecognizerDelegate {
+  func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
+    
+    if navigationController?.viewControllers.count == 2 {
+      return true
+    }
+    
+    if let navigationController = self.navigationController as? NavigationStack {
+      navigationController.showControllers()
+    }
+    
+    return false
+  }
+}

NavigationStackDemo/ViewControllers/FourthViewController/FourthViewController.swift

@@ -1,28 +0,0 @@
-//
-//  FourthViewController.swift
-//  NavigationStackDemo
-//
-//  Created by Alex K. on 29/02/16.
-//  Copyright © 2016 Alex K. All rights reserved.
-//
-
-import UIKit
-
-class FourthViewController: UITableViewController {
-
-  override func viewWillAppear(animated: Bool) {
-    super.viewWillAppear(animated)
-    
-    if let navigationController = navigationController {
-      navigationController.navigationBar.barTintColor = UIColor(red:0.78, green:0.89, blue:0.58, alpha:1)
-    }
-  }
-  
-  @IBAction func backHandler(sender: AnyObject) {
-    navigationController?.popViewControllerAnimated(true)
-  }
-  
-  override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
-    performSegueWithIdentifier("push", sender: nil)
-  }
-}

NavigationStackDemo/ViewControllers/SecondViewController/SecondViewController.swift

@@ -13,9 +13,11 @@ class SecondViewController: UITableViewController {
   override func viewWillAppear(animated: Bool) {
     super.viewWillAppear(animated)
     
-    if let navigationController = navigationController {
-      navigationController.navigationBar.barTintColor = UIColor(red:0.61, green:0.86, blue:0.87, alpha:1)
-    }
+//    if let navigationController = navigationController {
+////      navigationController.navigationBar.barTintColor = UIColor(red:0.61, green:0.86, blue:0.87, alpha:1)
+////      tableView.contentOffset = CGPoint(x: 0, y: -44)
+////      navigationController.navigationBar.translucent = true
+//    }
   }
 
 

NavigationStackDemo/ViewControllers/ThirdViewController/ThirdViewController.swift

@@ -10,12 +10,11 @@ import UIKit
 
 class ThirdViewController: UITableViewController {
   
+  @IBInspectable var navbarColor: UIColor = .blackColor()
+  
   override func viewWillAppear(animated: Bool) {
     super.viewWillAppear(animated)
     
-    if let navigationController = navigationController {
-      navigationController.navigationBar.barTintColor = UIColor(red:0.97, green:0.74, blue:0.58, alpha:1)
-    }
   }
   
   @IBAction func backHandler(sender: AnyObject) {

NavigationStackDemoUITests/Info.plist

@@ -1,24 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>en</string>
-	<key>CFBundleExecutable</key>
-	<string>$(EXECUTABLE_NAME)</string>
-	<key>CFBundleIdentifier</key>
-	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>$(PRODUCT_NAME)</string>
-	<key>CFBundlePackageType</key>
-	<string>BNDL</string>
-	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
-	<key>CFBundleSignature</key>
-	<string>????</string>
-	<key>CFBundleVersion</key>
-	<string>1</string>
-</dict>
-</plist>

NavigationStackDemoUITests/NavigationStackDemoUITests.swift

@@ -1,36 +0,0 @@
-//
-//  NavigationStackDemoUITests.swift
-//  NavigationStackDemoUITests
-//
-//  Created by Alex K. on 26/02/16.
-//  Copyright © 2016 Alex K. All rights reserved.
-//
-
-import XCTest
-
-class NavigationStackDemoUITests: XCTestCase {
-        
-    override func setUp() {
-        super.setUp()
-        
-        // Put setup code here. This method is called before the invocation of each test method in the class.
-        
-        // In UI tests it is usually best to stop immediately when a failure occurs.
-        continueAfterFailure = false
-        // UI tests must launch the application that they test. Doing this in setup will make sure it happens for each test method.
-        XCUIApplication().launch()
-
-        // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
-    }
-    
-    override func tearDown() {
-        // Put teardown code here. This method is called after the invocation of each test method in the class.
-        super.tearDown()
-    }
-    
-    func testExample() {
-        // Use recording to get started writing UI tests.
-        // Use XCTAssert and related functions to verify your tests produce the correct results.
-    }
-    
-}

README.md

@@ -1,5 +1,16 @@
 ![header](./header.png)
+
 # navigation-stack
+[![Twitter](https://img.shields.io/badge/Twitter-@Ramotion-blue.svg?style=flat)](http://twitter.com/Ramotion)
+[![CocoaPods](https://img.shields.io/cocoapods/p/Navigation-stack.svg)](https://cocoapods.org/pods/Navigation-stack)
+[![CocoaPods](https://img.shields.io/cocoapods/v/Navigation-stack.svg)](http://cocoapods.org/pods/Navigation-stack)
+[![Travis](https://img.shields.io/travis/Ramotion/navigation-stack.svg)](https://travis-ci.org/Ramotion/navigation-stack)
+[![codebeat badge](https://codebeat.co/badges/c322a039-b06b-46d9-bf40-e48cf0365b97)](https://codebeat.co/projects/github-com-ramotion-navigation-stack)
+
+[shot on dribbble](https://dribbble.com/shots/2583175-Navigation-Stack-Swift-Open-Source):
+![Animation](Navigation-Stack.gif)
+
+The [iPhone mockup](https://store.ramotion.com/product/iphone-6-mockups?utm_source=gthb&utm_medium=special&utm_campaign=navigation-stack) available [here](https://store.ramotion.com/product/iphone-6-mockups?utm_source=gthb&utm_medium=special&utm_campaign=navigation-stack).
 
 ## Requirements
 
@@ -10,6 +21,11 @@
 
 Just add the Source folder to your project.
 
+or use [CocoaPods](https://cocoapods.org) with Podfile:
+``` ruby
+pod 'Navigation-stack', '~> 0.0.2'
+```
+
 ## Usage
 
 1) YourNavigationController inherit from `NavigationStack`
@@ -47,7 +63,7 @@ See [LICENSE](./LICENSE) for details.
 
 
 ## About
-The project maintained by [app development agency](https://ramotion.com?utm_source=gthb&utm_medium=special&utm_campaign=navigation-stack) [Ramotion Inc.](https://ramotion.com?utm_source=gthb&utm_medium=special&utm_campaign=foolding-cell)
+The project maintained by [app development agency](https://ramotion.com?utm_source=gthb&utm_medium=special&utm_campaign=navigation-stack) [Ramotion Inc.](https://ramotion.com?utm_source=gthb&utm_medium=special&utm_campaign=navigation-stack)
 See our other [open-source projects](https://github.com/ramotion) or [hire](https://ramotion.com?utm_source=gthb&utm_medium=special&utm_campaign=navigation-stack) us to design, develop, and grow your product.
 
 [![Twitter URL](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=https://github.com/ramotion/navigation-stack)

Source/CollectionView/Cell/CollectionViewStackCell.swift

@@ -54,6 +54,7 @@ extension CollectionViewStackCell {
 
     let imageView = UIImageView(frame: CGRect.zero)
     imageView.translatesAutoresizingMaskIntoConstraints = false
+    imageView.layer.shouldRasterize = true
     contentView.addSubview(imageView)
     
     contentView.addConstraints([
@@ -84,5 +85,20 @@ extension CollectionViewStackCell {
     layer.shadowPath = UIBezierPath(rect: bounds).CGPath
     layer.shouldRasterize = true;
   }
+  
+  private func addBlurOnImage(image: UIImageView) {
+    // create effect
+//    UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
+//    
+//    // add effect to an effect view
+//    UIVisualEffectView *effectView = [[UIVisualEffectView alloc]initWithEffect:blur];
+//    effectView.frame = self.view.frame;
+//    
+//    // add the effect view to the image view
+//    [self.imageView addSubview:effectView];
+    
+    
+  }
+
 
 }

Source/CollectionView/CollectionStackViewController.swift

@@ -43,7 +43,8 @@ class CollectionStackViewController: UICollectionViewController {
     overlay: Float,
     scaleRatio: Float,
     scaleValue: Float,
-    bgColor: UIColor,
+    bgColor: UIColor = UIColor.clearColor(),
+    bgView: UIView? = nil,
     decelerationRate:CGFloat) {
       
       self.screens  = images
@@ -55,6 +56,7 @@ class CollectionStackViewController: UICollectionViewController {
       
       if let collectionView = self.collectionView {
         collectionView.backgroundColor  = bgColor
+        collectionView.backgroundView   = bgView
         collectionView.decelerationRate = decelerationRate
       }
   }
@@ -119,8 +121,6 @@ extension CollectionStackViewController {
   }
   
   override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
-    delegate?.controllerDidSelected(index: indexPath.row)
-    
     guard let currentCell = collectionView.cellForItemAtIndexPath(indexPath) else {
       return
     }
@@ -130,11 +130,10 @@ extension CollectionStackViewController {
     animations: { () -> Void in
       for  cell in self.collectionView!.visibleCells() where cell != currentCell {
         let row = self.collectionView?.indexPathForCell(cell)?.row
-        if row > indexPath.row { // move right
-          cell.center = CGPoint(x: cell.center.x + self.view.bounds.size.width * 2, y: cell.center.y)
-        } else { // move left
-          cell.center = CGPoint(x: cell.center.x - self.view.bounds.size.width * 2, y: cell.center.y)
-        }
+        let xPosition = row < indexPath.row ? cell.center.x - self.view.bounds.size.width * 2
+                                            : cell.center.x + self.view.bounds.size.width * 2
+        
+        cell.center = CGPoint(x: xPosition, y: cell.center.y)
       }
       }, completion: nil)
     
@@ -152,7 +151,10 @@ extension CollectionStackViewController {
       currentCell.alpha = 1
       
     }) { (success) -> Void in
+      dispatch_async(dispatch_get_main_queue(), { () -> Void in
+        self.delegate?.controllerDidSelected(index: indexPath.row)
         self.dismissViewControllerAnimated(false, completion: nil)
+      })
     }
   }
 }

Source/CollectionView/FlowLayout/CollectionViewStackFlowLayout.swift

@@ -105,28 +105,33 @@ extension CollectionViewStackFlowLayout {
 
 extension CollectionViewStackFlowLayout {
 
-  private func transformScale(attributes: UICollectionViewLayoutAttributes, allWidth: CGFloat, offset: CGFloat) -> CGAffineTransform {
-    var maximum = CGFloat(maxScale) - CGFloat(itemsCount - attributes.indexPath.row) / CGFloat(scaleRatio)
-    maximum += CGFloat(1.0 - maximum) * CGFloat(additionScale)
-    var minimum = CGFloat(maxScale - 0.1) - CGFloat(itemsCount - attributes.indexPath.row) / CGFloat(scaleRatio)
-    minimum += CGFloat(1.0 - minimum) * CGFloat(additionScale)
-    
-    var currentScale = (maximum + minimum) - (minimum + offset / (allWidth / (maximum - minimum)))
-    currentScale = max(min(maximum, currentScale), minimum)
-    return CGAffineTransformMakeScale(currentScale, currentScale)
+  private func transformScale(attributes: UICollectionViewLayoutAttributes,
+    allWidth: CGFloat,
+    offset: CGFloat) -> CGAffineTransform {
+      var maximum = CGFloat(maxScale) - CGFloat(itemsCount - attributes.indexPath.row) / CGFloat(scaleRatio)
+      maximum += CGFloat(1.0 - maximum) * CGFloat(additionScale)
+      
+      var minimum = CGFloat(maxScale - 0.1) - CGFloat(itemsCount - attributes.indexPath.row) / CGFloat(scaleRatio)
+      minimum += CGFloat(1.0 - minimum) * CGFloat(additionScale)
+      
+      var currentScale = (maximum + minimum) - (minimum + offset / (allWidth / (maximum - minimum)))
+      currentScale = max(min(maximum, currentScale), minimum)
+      return CGAffineTransformMakeScale(currentScale, currentScale)
   }
   
-  private func transformMove(attributes: UICollectionViewLayoutAttributes, itemWidth: CGFloat, offset: CGFloat) -> CGAffineTransform {
-    var currentContentOffsetX = offset - itemWidth * CGFloat(attributes.indexPath.row)
-    currentContentOffsetX = min(max(currentContentOffsetX, 0),itemWidth)
-    
-    var dx = (currentContentOffsetX / itemWidth)
-    if let collectionView = self.collectionView {
-      dx *= collectionView.bounds.size.width / 8.0
-    }
-    dx = currentContentOffsetX - dx
+  private func transformMove(attributes: UICollectionViewLayoutAttributes,
+    itemWidth: CGFloat,
+    offset: CGFloat) -> CGAffineTransform {
+      var currentContentOffsetX = offset - itemWidth * CGFloat(attributes.indexPath.row)
+      currentContentOffsetX = min(max(currentContentOffsetX, 0),itemWidth)
+      
+      var dx = (currentContentOffsetX / itemWidth)
+      if let collectionView = self.collectionView {
+        dx *= collectionView.bounds.size.width / 8.0
+      }
+      dx = currentContentOffsetX - dx
 
-    return CGAffineTransformMakeTranslation(dx, 0)
+      return CGAffineTransformMakeTranslation(dx, 0)
   }
   
   private func calculateAlpha(attributes: UICollectionViewLayoutAttributes, itemWidth: CGFloat, offset: CGFloat) -> CGFloat {

Source/NavigationStack.swift

@@ -29,13 +29,14 @@ import UIKit
 
 public class NavigationStack: UINavigationController {
   
-  @IBInspectable var overlay: Float = 0.8
-  @IBInspectable var scaleRatio: Float = 14.0
-  @IBInspectable var scaleValue: Float = 0.99
-  @IBInspectable var decelerationRate: CGFloat = UIScrollViewDecelerationRateNormal
+  @IBInspectable public var overlay: Float = 0.8
+  @IBInspectable public var scaleRatio: Float = 14.0
+  @IBInspectable public var scaleValue: Float = 0.99
+  @IBInspectable public var decelerationRate: CGFloat = UIScrollViewDecelerationRateNormal
   
-  @IBInspectable var bgColor: UIColor = .blackColor()
+  @IBInspectable public var bgColor: UIColor = .blackColor()
   
+  public var bgView: UIView? = nil
   private var screens = [UIImage]()
   
   weak public var stackDelegate: UINavigationControllerDelegate? // use this instead delegate
@@ -51,6 +52,10 @@ public class NavigationStack: UINavigationController {
 
 extension NavigationStack {
   public func showControllers() {
+    if screens.count == 0 {
+      return
+    }
+    
     var allScreens = screens
     allScreens.append(view.takeScreenshot())
     let collectioView = CollectionStackViewController(images: allScreens,
@@ -59,6 +64,7 @@ extension NavigationStack {
       scaleRatio: scaleRatio,
       scaleValue: scaleValue,
       bgColor: bgColor,
+      bgView: bgView,
       decelerationRate: decelerationRate)
         
     presentViewController(collectioView, animated: false, completion: nil)