Implementation of the feature for playing GIFs in full-screen preview

CTAssetsPickerController.podspec

@@ -24,4 +24,18 @@ Pod::Spec.new do |spec|
   spec.ios.frameworks        = 'Photos'
   spec.requires_arc          = true
   spec.dependency            'PureLayout', '~> 3.0.0'
+
+  # only the core libary is used by default
+  spec.default_subspec = 'Core'
+
+  # subspec for the main functionality.
+  spec.subspec 'Core' do |core|
+
+  end
+
+  # subspec for GIF plugin.
+  spec.subspec 'GIF' do |gif|
+    gif.xcconfig                = { 'OTHER_CFLAGS' => '$(inherited) -DCTASSETS_GIF_ENABLED' }
+    gif.dependency              'YYImage'
+  end
 end

CTAssetsPickerController/CTAssetItemViewController.m

@@ -86,6 +86,20 @@ - (void)viewWillAppear:(BOOL)animated
 {
     [super viewWillAppear:animated];
     [self setupScrollViewButtons];
+
+#ifdef CTASSETS_GIF_ENABLED
+  // Get resource objects that describe the data files that an asset represents.
+  NSArray *assetResources = [PHAssetResource assetResourcesForAsset: self.asset];
+
+  // To determine GIF type only the first asset resource is required.
+  PHAssetResource *firstFoundResource = assetResources[0];
+
+  if([firstFoundResource.uniformTypeIdentifier isEqualToString:(NSString *)kUTTypeGIF])
+  {
+    [self requestAssetAnimatedImage];
+    return;
+  }
+#endif
     [self requestAssetImage];
 }
 
@@ -227,6 +241,44 @@ - (PHImageRequestOptions *)imageRequestOptions
     return options;
 }
 
+#ifdef CTASSETS_GIF_ENABLED
+
+#pragma mark - Request animated image
+
+- (void)requestAssetAnimatedImage {
+    [self.scrollView setProgress:0];
+
+    PHImageRequestOptions *options = [self imageRequestOptions];
+
+    self.imageRequestID =
+    [self.imageManager requestImageDataForAsset:self.asset
+                                        options:options
+                                  resultHandler:^(NSData * imageData, NSString * dataUTI, UIImageOrientation orientation, NSDictionary * info) {
+
+                                      NSError *error = [info objectForKey:PHImageErrorKey];
+
+                                      if(error)
+                                      {
+                                          dispatch_async(dispatch_get_main_queue(), ^{
+
+                                              [self showRequestImageError:error title:nil];
+                                          });
+                                      }
+                                      else
+                                      {
+                                        YYImage *animatedImage = [YYImage imageWithData:imageData];
+
+                                        self.image = animatedImage;
+
+                                        dispatch_async(dispatch_get_main_queue(), ^{
+
+                                          [self.scrollView bind:self.asset image:animatedImage requestInfo:info];
+                                        });
+                                      }
+                                  }];
+}
+
+#endif
 
 #pragma mark - Request player item
 

CTAssetsPickerController/CTAssetScrollView.h

@@ -29,6 +29,12 @@
 #import "CTAssetPlayButton.h"
 #import "CTAssetSelectionButton.h"
 
+#ifdef CTASSETS_GIF_ENABLED
+
+#import <MobileCoreServices/MobileCoreServices.h>
+#import "YYImage/YYImage.h"
+
+#endif
 
 NS_ASSUME_NONNULL_BEGIN
 

CTAssetsPickerController/CTAssetScrollView.m

@@ -52,7 +52,12 @@ @interface CTAssetScrollView ()
 
 @property (nonatomic, assign) CGFloat perspectiveZoomScale;
 
-@property (nonatomic, strong) UIImageView *imageView;
+#ifdef CTASSETS_GIF_ENABLED
+  // YYAnimatedImageView is a subclass of UIImageView with support for playing GIFs
+  @property (nonatomic, strong) YYAnimatedImageView *imageView;
+#else
+  @property (nonatomic, strong) UIImageView *imageView;
+#endif
 
 @property (nonatomic, strong) UIProgressView *progressView;
 @property (nonatomic, strong) UIActivityIndicatorView *activityView;
@@ -104,7 +109,12 @@ - (void)dealloc
 
 - (void)setupViews
 {
+#ifdef CTASSETS_GIF_ENABLED
+    YYAnimatedImageView *imageView = [YYAnimatedImageView new];
+#else
     UIImageView *imageView = [UIImageView new];
+#endif
+
     imageView.isAccessibilityElement    = YES;
     imageView.accessibilityTraits       = UIAccessibilityTraitImage;
     self.imageView = imageView;

Podfile.lock

@@ -1,5 +1,8 @@
 PODS:
-  - CTAssetsPickerController (3.3.1):
+  - CTAssetsPickerController (3.3.2-alpha):
+    - CTAssetsPickerController/Core (= 3.3.2-alpha)
+    - PureLayout (~> 3.0.0)
+  - CTAssetsPickerController/Core (3.3.2-alpha):
     - PureLayout (~> 3.0.0)
   - PureLayout (3.0.1)
 
@@ -8,10 +11,10 @@ DEPENDENCIES:
 
 EXTERNAL SOURCES:
   CTAssetsPickerController:
-    :path: .
+    :path: "."
 
 SPEC CHECKSUMS:
-  CTAssetsPickerController: b1d1d50ab87cf6b8b13531de5f4530482e7e53ed
+  CTAssetsPickerController: d0e938e161a59cddf159621371c1be220a7d4b05
   PureLayout: f35f5384c9c4e4479df041dbe33ad7577b71ddfb
 
 COCOAPODS: 0.39.0