Add option to request other type of PHAsset like Video during loading

Author: dreampiggy

SDWebImagePhotosPlugin/Classes/SDWebImagePhotosLoader.h

@@ -37,4 +37,11 @@
  */
 @property (nonatomic, strong, nullable) PHImageRequestOptions *imageRequestOptions;
 
+/**
+ Whether we request only `PHAssetMediaTypeImage` asset and ignore other types (video/audio/unknown).
+ When we found other type, an error `SDWebImagePhotosErrorNotImageAsset` will be reported.
+ Defaults to YES. If you prefer to load other type like video asset's poster image, set this value to NO.
+ */
+@property (nonatomic, assign) BOOL requestImageAssetOnly;
+
 @end

SDWebImagePhotosPlugin/Classes/SDWebImagePhotosLoader.m

@@ -77,6 +77,7 @@ - (instancetype)init {
         requestOptions.version = PHImageRequestOptionsVersionCurrent;
         self.imageRequestOptions = requestOptions;
         self.operationsTable = [NSHashTable weakObjectsHashTable];
+        self.requestImageAssetOnly = YES;
         self.fetchQueue = dispatch_queue_create("SDWebImagePhotosLoader", DISPATCH_QUEUE_SERIAL);
 #if SD_UIKIT
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
@@ -155,8 +156,8 @@ - (BOOL)canRequestImageForURL:(NSURL *)url {
             PHFetchResult<PHAsset *> *fetchResult = [PHAsset fetchAssetsWithLocalIdentifiers:@[localIdentifier] options:fetchOptions];
             asset = fetchResult.firstObject;
         }
-        // Only support image
-        if (!asset || asset.mediaType != PHAssetMediaTypeImage) {
+        // Check whether we should request only image asset
+        if (!asset || (self.requestImageAssetOnly && asset.mediaType != PHAssetMediaTypeImage)) {
             // Call error
             NSError *error = [NSError errorWithDomain:SDWebImagePhotosErrorDomain code:SDWebImagePhotosErrorNotImageAsset userInfo:nil];
             if (completedBlock) {