Updated for Swift 3.2 and 4.0

.swift-version

@@ -1 +1 @@
-3.0
+4.0

.travis.yml

@@ -1,7 +1,10 @@
 language: objective-c
-osx_image: xcode8.1
+osx_image: xcode9
 podfile: Example/Podfile
 
+before_install:
+    - pod repo update --silent
+
 script:
-- set -o pipefail && xcodebuild test -workspace Example/Optik.xcworkspace -scheme Optik-Example -destination 'platform=iOS Simulator,name=iPhone 7,OS=10.1' | xcpretty
-- pod lib lint
+    - set -o pipefail && xcodebuild test -workspace Example/Optik.xcworkspace -scheme Optik-Example -destination 'platform=iOS Simulator,name=iPhone 7,OS=11.0' | xcpretty
+    - pod lib lint

Example/.swift-version

@@ -1 +1 @@
-3.0
+4.0

Example/Optik.xcodeproj/project.pbxproj

@@ -238,7 +238,7 @@
 				TargetAttributes = {
 					607FACCF1AFB9204008FA782 = {
 						CreatedOnToolsVersion = 6.3.1;
-						LastSwiftMigration = 0810;
+						LastSwiftMigration = 0900;
 					};
 					607FACE41AFB9204008FA782 = {
 						CreatedOnToolsVersion = 6.3.1;
@@ -297,9 +297,16 @@
 			files = (
 			);
 			inputPaths = (
+				"${SRCROOT}/Pods/Target Support Files/Pods-Optik_Example/Pods-Optik_Example-frameworks.sh",
+				"${BUILT_PRODUCTS_DIR}/Alamofire/Alamofire.framework",
+				"${BUILT_PRODUCTS_DIR}/AlamofireImage/AlamofireImage.framework",
+				"${BUILT_PRODUCTS_DIR}/Optik/Optik.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";
 			outputPaths = (
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Alamofire.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/AlamofireImage.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Optik.framework",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
@@ -327,9 +334,12 @@
 			files = (
 			);
 			inputPaths = (
+				"${SRCROOT}/Pods/Target Support Files/Pods-Optik_Tests/Pods-Optik_Tests-frameworks.sh",
+				"${BUILT_PRODUCTS_DIR}/Optik/Optik.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";
 			outputPaths = (
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Optik.framework",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
@@ -342,13 +352,16 @@
 			files = (
 			);
 			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
 			);
 			name = "[CP] Check Pods Manifest.lock";
 			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-Optik_Example-checkManifestLockResult.txt",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "diff \"${PODS_ROOT}/../Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run \'pod install\' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n";
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
 			showEnvVarsInLog = 0;
 		};
 		C1CD7E2768F81665C8539E60 /* [CP] Copy Pods Resources */ = {
@@ -372,13 +385,16 @@
 			files = (
 			);
 			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
 			);
 			name = "[CP] Check Pods Manifest.lock";
 			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-Optik_Tests-checkManifestLockResult.txt",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "diff \"${PODS_ROOT}/../Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run \'pod install\' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n";
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
 			showEnvVarsInLog = 0;
 		};
 /* End PBXShellScriptBuildPhase section */
@@ -469,7 +485,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.3;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -507,7 +523,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.3;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
@@ -525,7 +541,7 @@
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.prolificinteractive.Optik-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -540,7 +556,7 @@
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.prolificinteractive.Optik-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -560,7 +576,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -576,7 +592,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};

Example/Optik/Images.xcassets/AppIcon.appiconset/Contents.json

@@ -1,5 +1,15 @@
 {
   "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
     {
       "idiom" : "iphone",
       "size" : "29x29",
@@ -29,10 +39,15 @@
       "idiom" : "iphone",
       "size" : "60x60",
       "scale" : "3x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
     }
   ],
   "info" : {
     "version" : 1,
     "author" : "xcode"
   }
-}
+}

Example/Optik/Info.plist

@@ -32,10 +32,12 @@
 	</array>
 	<key>UISupportedInterfaceOrientations</key>
 	<array>
-		<string>UIInterfaceOrientationPortrait</string>
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
 		<string>UIInterfaceOrientationLandscapeRight</string>
+		<string>UIInterfaceOrientationPortrait</string>
 	</array>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<true/>
 </dict>
 </plist>

Example/Podfile

@@ -2,10 +2,14 @@ source 'https://github.com/CocoaPods/Specs.git'
 use_frameworks!
 
 target 'Optik_Example' do
-  pod 'Optik', :path => '../'
-  pod 'AlamofireImage', '3.1.0'
+    platform :ios, '9.0'
+
+    pod 'Optik', :path => '../'
+    pod 'AlamofireImage', '3.3.0'
 end
 
 target 'Optik_Tests' do
-  pod 'Optik', :path => '../'
+    platform :ios, '9.0'
+
+    pod 'Optik', :path => '../'
 end

Example/Podfile.lock

@@ -1,22 +1,22 @@
 PODS:
-  - Alamofire (4.1.0)
-  - AlamofireImage (3.1.0):
-    - Alamofire (~> 4.0)
+  - Alamofire (4.5.1)
+  - AlamofireImage (3.3.0):
+    - Alamofire (~> 4.5)
   - Optik (0.2.0)
 
 DEPENDENCIES:
-  - AlamofireImage (= 3.1.0)
+  - AlamofireImage (= 3.3.0)
   - Optik (from `../`)
 
 EXTERNAL SOURCES:
   Optik:
-    :path: "../"
+    :path: ../
 
 SPEC CHECKSUMS:
-  Alamofire: e266cf991b933498df791e645e0d8ac294492153
-  AlamofireImage: bb8c8351c51cb1633bb6be69b6dbbaff37ce65b7
-  Optik: 1601123d313b0ef1925912bcb97c1d18fedf5a4b
+  Alamofire: 2d95912bf4c34f164fdfc335872e8c312acaea4a
+  AlamofireImage: 2e784dc5d00f04903a52c1d169181469c805c3df
+  Optik: 3d3905f19e503f8fc30343edea05856721b38014
 
-PODFILE CHECKSUM: c4cc51091b7726b48b7d19365a55eb8f1cc861f2
+PODFILE CHECKSUM: 3873430f0694557b2b3fc21b9a5a450f371f986e
 
-COCOAPODS: 1.2.0
+COCOAPODS: 1.3.1

Optik.podspec

@@ -12,7 +12,7 @@ Optik provides a simple viewing experience for a set of images, whether stored l
   s.author           = { "htinlinn" => "linn@prolificinteractive.com" }
   s.source           = { :git => "https://github.com/prolificinteractive/Optik.git", :tag => s.version.to_s }
 
-  s.platform     = :ios, '8.0'
+  s.platform     = :ios, '9.0'
   s.requires_arc = true
 
   s.source_files = 'Optik/Classes/**/*'

Optik/Classes/AlbumViewController.swift

@@ -12,10 +12,11 @@ import UIKit
 internal final class AlbumViewController: UIViewController {
 
     private struct Constants {
-        static let SpacingBetweenImages: CGFloat = 40
-        static let DismissButtonDimension: CGFloat = 60
+        static let spacingBetweenImages: CGFloat = 40
+        static let dismissButtonDimension: CGFloat = 60
 
-        static let TransitionAnimationDuration: TimeInterval = 0.3
+        static let transitionAnimationDuration: TimeInterval = 0.3
+        static let artificialDelayDuration: TimeInterval = 0.001
     }
 
     // MARK: - Properties
@@ -71,6 +72,8 @@ internal final class AlbumViewController: UIViewController {
     private var imageData: ImageData
     private var initialImageDisplayIndex: Int
     private var activityIndicatorColor: UIColor?
+
+    private var dismissButton: UIButton?
     private var dismissButtonImage: UIImage?
     private var dismissButtonPosition: DismissButtonPosition
 
@@ -95,7 +98,7 @@ internal final class AlbumViewController: UIViewController {
 
         pageViewController = UIPageViewController(transitionStyle: .scroll,
                                                   navigationOrientation: .horizontal,
-                                                  options: [UIPageViewControllerOptionInterPageSpacingKey : Constants.SpacingBetweenImages])
+                                                  options: [UIPageViewControllerOptionInterPageSpacingKey : Constants.spacingBetweenImages])
 
         super.init(nibName: nil, bundle: nil)
 
@@ -116,14 +119,19 @@ internal final class AlbumViewController: UIViewController {
 
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
-
-        // HACK: UIKit doesn't animate status bar transition on iOS 9. So, manually animate it.
+
         if !viewDidAppear {
             viewDidAppear = true
-
-            UIView.animate(withDuration: Constants.TransitionAnimationDuration, animations: {
+
+            // UIKit doesn't animate status bar transition on iOS 9. So, manually animate it.
+            UIView.animate(withDuration: Constants.transitionAnimationDuration, animations: {
                 self.setNeedsStatusBarAppearanceUpdate()
-            }) 
+            })
+
+            // Wait for the safe area insets to be in effect and set up the constraints.
+            DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + Constants.artificialDelayDuration, execute: {
+                self.setupDismissButtonConstraints()
+            })
         }
     }
 
@@ -170,48 +178,30 @@ internal final class AlbumViewController: UIViewController {
         dismissButton.translatesAutoresizingMaskIntoConstraints = false
         dismissButton.setImage(dismissButtonImage, for: UIControlState())
         dismissButton.addTarget(self, action: #selector(AlbumViewController.didTapDismissButton(_:)), for: .touchUpInside)
-
-        let xAnchorAttribute = dismissButtonPosition.xAnchorAttribute()
-        let yAnchorAttribute = dismissButtonPosition.yAnchorAttribute()
-
         view.addSubview(dismissButton)
-
-        view.addConstraint(
-            NSLayoutConstraint(item: dismissButton,
-                attribute: xAnchorAttribute,
-                relatedBy: .equal,
-                toItem: view,
-                attribute: xAnchorAttribute,
-                multiplier: 1,
-                constant: 0)
-        )
-        view.addConstraint(
-            NSLayoutConstraint(item: dismissButton,
-                attribute: yAnchorAttribute,
-                relatedBy: .equal,
-                toItem: view,
-                attribute: yAnchorAttribute,
-                multiplier: 1,
-                constant: 0)
-        )
-        view.addConstraint(
-            NSLayoutConstraint(item: dismissButton,
-                attribute: .width,
-                relatedBy: .equal,
-                toItem: nil,
-                attribute: .notAnAttribute,
-                multiplier: 1,
-                constant: Constants.DismissButtonDimension)
-        )
-        view.addConstraint(
-            NSLayoutConstraint(item: dismissButton,
-                attribute: .height,
-                relatedBy: .equal,
-                toItem: nil,
-                attribute: .notAnAttribute,
-                multiplier: 1,
-                constant: Constants.DismissButtonDimension)
-        )
+
+        self.dismissButton = dismissButton
+    }
+
+    private func setupDismissButtonConstraints() {
+        if #available(iOS 11.0, *), view.safeAreaInsets.top > 0 {
+            // Using `safeAreaLayoutGuide` on devices other than iPhone X causes a visual glitch
+            // where the button shifts down before dimissing.
+            // So, restrict this to devices with top inset that is greater than 0.
+            dismissButton?.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 0).isActive = true
+        } else {
+            dismissButton?.topAnchor.constraint(equalTo: view.topAnchor, constant: 0).isActive = true
+        }
+
+        switch dismissButtonPosition {
+        case .topLeading:
+            dismissButton?.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0).isActive = true
+        case .topTrailing:
+            dismissButton?.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 0).isActive = true
+        }
+
+        dismissButton?.widthAnchor.constraint(equalToConstant: Constants.dismissButtonDimension).isActive = true
+        dismissButton?.heightAnchor.constraint(equalToConstant: Constants.dismissButtonDimension).isActive = true
     }
 
     private func setupPanGestureRecognizer() {

Optik/Classes/Animation/SpringAnimation.swift

@@ -9,7 +9,7 @@
 import UIKit
 
 /// Animation that moves a given view to a new target using spring physics.
-internal final class SpringAnimation<T: VectorRepresentable, U: AnimatableProperty> where T == U.PropertyType {
+internal final class SpringAnimation<T, U: AnimatableProperty> where T == U.PropertyType {
 
     // MARK: - Properties