Sync the disk cache store logic from SDWebImage 5.6.0

Author: dreampiggy

SDWebImageYYPlugin/Classes/YYCache/YYCacheBridge/YYCache+SDAdditions.m

@@ -12,13 +12,25 @@
 
 static NSData * SDYYPluginCacheDataWithImageData(UIImage *image, NSData *imageData) {
     NSData *data = imageData;
+    if (!data && [image conformsToProtocol:@protocol(SDAnimatedImage)]) {
+        // If image is custom animated image class, prefer its original animated data
+        data = [((id<SDAnimatedImage>)image) animatedImageData];
+    }
     if (!data && image) {
-        // If we do not have any data to detect image format, check whether it contains alpha channel to use PNG or JPEG format
-        SDImageFormat format;
-        if ([SDImageCoderHelper CGImageContainsAlpha:image.CGImage]) {
-            format = SDImageFormatPNG;
-        } else {
-            format = SDImageFormatJPEG;
+        // Check image's associated image format, may return .undefined
+        SDImageFormat format = image.sd_imageFormat;
+        if (format == SDImageFormatUndefined) {
+            // If image is animated, use GIF (APNG may be better, but has bugs before macOS 10.14)
+            if (image.sd_isAnimated) {
+                format = SDImageFormatGIF;
+            } else {
+                // If we do not have any data to detect image format, check whether it contains alpha channel to use PNG or JPEG format
+                if ([SDImageCoderHelper CGImageContainsAlpha:image.CGImage]) {
+                    format = SDImageFormatPNG;
+                } else {
+                    format = SDImageFormatJPEG;
+                }
+            }
         }
         data = [[SDImageCodersManager sharedManager] encodedDataWithImage:image format:format options:nil];
     }
@@ -116,7 +128,10 @@ @implementation YYCache (SDAdditions)
                             }
                         } else {
                             @try {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
                                 extendedObject = [NSKeyedUnarchiver unarchiveObjectWithData:extendedData];
+#pragma clang diagnostic pop
                             } @catch (NSException *exception) {
                                 NSLog(@"NSKeyedUnarchiver unarchive failed with exception: %@", exception);
                             }
@@ -183,7 +198,10 @@ - (void)storeImageToDisk:(UIImage *)image imageData:(NSData *)imageData forKey:(
                 }
             } else {
                 @try {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
                     extendedData = [NSKeyedArchiver archivedDataWithRootObject:extendedObject];
+#pragma clang diagnostic pop
                 } @catch (NSException *exception) {
                     NSLog(@"NSKeyedArchiver archive failed with exception: %@", exception);
                 }