Add lightweight generics

Pod/Source/AFNetworking/DFAFImageFetcher.h

@@ -45,7 +45,7 @@ extern NSString *__nonnull const DFAFRequestCachePolicyKey;
 /*! A set containing all the supported URL schemes. The default set contains "http", "https", "ftp", "file" and "data" schemes.
  @note The property can be changed in case there are any custom protocols supported by NSURLSession.
  */
-@property (nonnull, nonatomic, copy) NSSet *supportedSchemes;
+@property (nonnull, nonatomic, copy) NSSet<NSString *> *supportedSchemes;
 
 /*! Initializes the DFURLImageFetcher with a given session manager.
  */

Pod/Source/Core/Managing/DFCompositeImageManager.h

@@ -12,7 +12,7 @@
 
 /*! Initializes composite image manager with an array of image managers.
  */
-- (nonnull instancetype)initWithImageManagers:(nonnull NSArray /* id<DFImageManaging> */ *)imageManagers;
+- (nonnull instancetype)initWithImageManagers:(nonnull NSArray<id<DFImageManaging>> *)imageManagers;
 
 /*! Adds image manager to the end of the chain.
  */

Pod/Source/Core/Managing/DFCompositeImageManager.m

@@ -16,7 +16,7 @@
     __df_outManager; })
 
 @implementation DFCompositeImageManager {
-    NSMutableArray /* id<DFImageManaging> */ *_managers;
+    NSMutableArray<id<DFImageManaging>> *_managers;
 }
 
 - (nonnull instancetype)init {
@@ -26,7 +26,7 @@ - (nonnull instancetype)init {
     return self;
 }
 
-- (nonnull instancetype)initWithImageManagers:(nonnull NSArray *)imageManagers {
+- (nonnull instancetype)initWithImageManagers:(nonnull NSArray<id<DFImageManaging>> *)imageManagers {
     if (self = [self init]) {
         [_managers addObjectsFromArray:imageManagers];
     }
@@ -59,7 +59,7 @@ - (nonnull DFImageTask *)imageTaskForRequest:(nonnull DFImageRequest *)request c
     return [manager imageTaskForRequest:request completion:completion];
 }
 
-- (void)getImageTasksWithCompletion:(void (^ __nullable)(NSArray * __nonnull, NSArray * __nonnull))completion {
+- (void)getImageTasksWithCompletion:(void (^ __nullable)(NSArray<DFImageTask *> * __nonnull, NSArray<DFImageTask *> * __nonnull))completion {
     NSMutableArray *allTasks = [NSMutableArray new];
     NSMutableArray *allPreheatingTasks = [NSMutableArray new];
     NSInteger __block numberOfCallbacks = (NSInteger)_managers.count;

Pod/Source/Core/Protocols/DFImageManaging.h

@@ -34,7 +34,7 @@ typedef void (^DFImageTaskCompletion)(UIImage *__nullable image, NSError *__null
 
 /*! Asynchronously calls a completion block on the main thread with all resumed outstanding image tasks and separate array with all preheating tasks.
  */
-- (void)getImageTasksWithCompletion:(void (^__nullable)(NSArray *__nonnull tasks, NSArray *__nonnull preheatingTasks))completion;
+- (void)getImageTasksWithCompletion:(void (^__nullable)(NSArray<DFImageTask *> *__nonnull tasks, NSArray<DFImageTask *> *__nonnull preheatingTasks))completion;
 
 /*! Cancels all outstanding requests, including preheating requests, and then invalidates the image manager. New image tasks may not be started.
  */
@@ -45,12 +45,12 @@ typedef void (^DFImageTaskCompletion)(UIImage *__nullable image, NSError *__null
  @note DFImageManager caches images with the exact target size, content mode, and options you specify in this method. If you later request an image with, for example, a different target size than you passed when calling this method, DFImageManager might have to generate a new image but would still be able to use cached image data.
  @note If this method is called twice with the same requests the second call would have no effect (unless first requests are completed).
  */
-- (void)startPreheatingImagesForRequests:(nonnull NSArray /* DFImageRequest */ *)requests;
+- (void)startPreheatingImagesForRequests:(nonnull NSArray<DFImageRequest *> *)requests;
 
 /*! Cancels preheating for the given requests.
  @note The request parameters shall exactly match the parameters used in startPreheatingImagesForRequests: method.
  */
-- (void)stopPreheatingImagesForRequests:(nonnull NSArray /* DFImageRequest */ *)requests;
+- (void)stopPreheatingImagesForRequests:(nonnull NSArray<DFImageRequest *> *)requests;
 
 /*! Cancels all image preheating tasks registered with a manager.
  */

Pod/Source/NSURLSession/DFURLHTTPResponseValidator.h

@@ -16,6 +16,6 @@
 /*! The acceptable MIME types for responses. Default value is nil so that all content types are supported. Image initialization never crashes when provided with an invalid data.
  @note All content types are acceptable in case acceptableContentTypes is nil.
  */
-@property (nullable, nonatomic, copy) NSSet *acceptableContentTypes;
+@property (nullable, nonatomic, copy) NSSet<NSString *> *acceptableContentTypes;
 
 @end

Pod/Source/NSURLSession/DFURLImageFetcher.h

@@ -61,7 +61,7 @@ extern NSString *const DFURLRequestCachePolicyKey;
 /*! A set containing all the supported URL schemes. The default set contains "http", "https", "ftp", "file" and "data" schemes.
  @note The property can be changed in case there are any custom protocols supported by NSURLSession.
  */
-@property (nonatomic, copy) NSSet *supportedSchemes;
+@property (nonatomic, copy) NSSet<NSString *> *supportedSchemes;
 
 /*! The delegate of the receiver.
  */

Pod/Source/UI/DFCollectionViewPreheatingController.h

@@ -15,7 +15,7 @@ NS_ASSUME_NONNULL_BEGIN
  @param addedIndexPaths Index paths for items added to the preheat window. Index paths are sorted so that the items closest to the previous preheat window are in the beginning of the array; no matter whether user is scrolling forward of backward.
  @param removedIndexPaths Index paths for items there were removed from the preheat window.
  */
-- (void)collectionViewPreheatingController:(DFCollectionViewPreheatingController *)controller didUpdatePreheatRectWithAddedIndexPaths:(NSArray *)addedIndexPaths removedIndexPaths:(NSArray *)removedIndexPaths;
+- (void)collectionViewPreheatingController:(DFCollectionViewPreheatingController *)controller didUpdatePreheatRectWithAddedIndexPaths:(NSArray<NSIndexPath *> *)addedIndexPaths removedIndexPaths:(NSArray<NSIndexPath *> *)removedIndexPaths;
 
 @end
 
@@ -25,7 +25,7 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @interface DFCollectionViewPreheatingController : NSObject
 
-/*! The collection view the receiver was initializer with.
+/*! The collection view the receiver was initialized with.
  */
 @property (nonatomic, readonly) UICollectionView *collectionView;
 
@@ -53,7 +53,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 /*! Returns current preheat indexes.
  */
-@property (nonatomic, readonly) NSSet *preheatIndexPaths;
+@property (nonatomic, readonly) NSSet<NSIndexPath *> *preheatIndexPaths;
 
 /*! Initializes preheating controller with a collection view.
  @param collectionView Collection view.

Pod/Source/UI/DFCollectionViewPreheatingController.m

@@ -83,7 +83,7 @@ - (void)_updatePreheatRect {
 
         _preheatIndexPaths = newIndexPaths;
 
-        NSArray *sortedAddedIndexPaths = [addedIndexPaths.allObjects sortedArrayUsingDescriptors:@[ [NSSortDescriptor sortDescriptorWithKey:@"section" ascending:isScrollingForward], [NSSortDescriptor sortDescriptorWithKey:@"item" ascending:isScrollingForward] ]];
+        NSArray<NSIndexPath *> *sortedAddedIndexPaths = [addedIndexPaths.allObjects sortedArrayUsingDescriptors:@[ [NSSortDescriptor sortDescriptorWithKey:@"section" ascending:isScrollingForward], [NSSortDescriptor sortDescriptorWithKey:@"item" ascending:isScrollingForward] ]];
 
         _preheatRect = preheatRect;
 
@@ -111,9 +111,9 @@ - (CGRect)_preheatRectForScrollingForward:(BOOL)forward {
     return CGRectIntegral(preheatRect);
 }
 
-- (NSArray *)_indexPathsForElementsInRect:(CGRect)rect {
-    NSArray *allLayoutAttributes = [self.collectionView.collectionViewLayout layoutAttributesForElementsInRect:rect];
-    NSMutableArray *indexPaths = [NSMutableArray new];
+- (NSArray<NSIndexPath *> *)_indexPathsForElementsInRect:(CGRect)rect {
+    NSArray<UICollectionViewLayoutAttributes *> *allLayoutAttributes = [self.collectionView.collectionViewLayout layoutAttributesForElementsInRect:rect];
+    NSMutableArray<NSIndexPath *> *indexPaths = [NSMutableArray new];
     for (UICollectionViewLayoutAttributes *attributes in allLayoutAttributes) {
         if (attributes.representedElementCategory == UICollectionElementCategoryCell) {
             [indexPaths addObject:attributes.indexPath];