Merge pull request #2888 from dreampiggy/bugfix_animated_player_when_invisible

Fix the case even when Animated Image View is not visible, user calll startAnimating can still do animation

SDWebImage/Core/SDAnimatedImagePlayer.m

@@ -108,6 +108,7 @@
     if (!_displayLink) {
         _displayLink = [SDDisplayLink displayLinkWithTarget:self selector:@selector(displayDidRefresh:)];
         [_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:self.runLoopMode];
+        [_displayLink stop];
     }
     return _displayLink;
 }
@@ -197,7 +198,7 @@
 }
 
 - (BOOL)isPlaying {
-    return self.displayLink.isRunning;
+    return _displayLink.isRunning;
 }
 
 - (void)seekToFrameAtIndex:(NSUInteger)index loopCount:(NSUInteger)loopCount {

SDWebImage/Core/SDAnimatedImageView.m

@@ -178,11 +178,8 @@
         // Ensure disabled highlighting; it's not supported (see `-setHighlighted:`).
         super.highlighted = NO;
         
-        // Update should animate
-        [self updateShouldAnimate];
-        if (self.shouldAnimate) {
-            [self startAnimating];
-        }
+        // Start animating
+        [self startAnimating];
 
         [self.imageViewLayer setNeedsDisplay];
     }
@@ -312,7 +309,10 @@
 - (void)startAnimating
 {
     if (self.player) {
-        [self.player startPlaying];
+        [self updateShouldAnimate];
+        if (self.shouldAnimate) {
+            [self.player startPlaying];
+        }
     } else {
 #if SD_UIKIT
         [super startAnimating];

Tests/Tests/SDAnimatedImageTest.m

@@ -108,12 +108,7 @@ static const NSUInteger kTestGIFFrameCount = 5; // local TestImage.gif loop coun
     SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testGIFData]];
     imageView.image = image;
     expect(imageView.image).notTo.beNil();
-#if SD_MAC
-    imageView.animates = YES;
-#else
-    [imageView startAnimating];
-#endif
-    expect(imageView.currentFrame).notTo.beNil(); // current frame
+    expect(imageView.player).notTo.beNil();
 }
 
 - (void)test09AnimatedImageViewSetAnimatedImageAPNG {
@@ -121,12 +116,7 @@ static const NSUInteger kTestGIFFrameCount = 5; // local TestImage.gif loop coun
     SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
     imageView.image = image;
     expect(imageView.image).notTo.beNil();
-    #if SD_MAC
-        imageView.animates = YES;
-    #else
-        [imageView startAnimating];
-    #endif
-    expect(imageView.currentFrame).notTo.beNil(); // current frame
+    expect(imageView.player).notTo.beNil();
 }
 
 - (void)test10AnimatedImageInitWithCoder {
@@ -187,6 +177,27 @@ static const NSUInteger kTestGIFFrameCount = 5; // local TestImage.gif loop coun
     expect(imageView.image).equal(image);
 }
 
+- (void)test14AnimatedImageViewStopPlayingWhenHidden {
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testGIFData]];
+    imageView.image = image;
+#if SD_UIKIT
+    [imageView startAnimating];
+#else
+    imageView.animates = YES;
+#endif
+    SDAnimatedImagePlayer *player = imageView.player;
+    expect(player).notTo.beNil();
+    expect(player.isPlaying).beTruthy();
+    imageView.hidden = YES;
+    expect(player.isPlaying).beFalsy();
+}
+
 - (void)test20AnimatedImageViewRendering {
     XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView rendering"];
     SDAnimatedImageView *imageView = [[SDAnimatedImageView alloc] init];
@@ -348,7 +359,7 @@ static const NSUInteger kTestGIFFrameCount = 5; // local TestImage.gif loop coun
     [self waitForExpectationsWithCommonTimeout];
 }
 
-- (void)test25AnimatedImageStopAnimatingClearBuffer {
+- (void)test26AnimatedImageStopAnimatingClearBuffer {
     XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView stopAnimating clear buffer when stopped"];
     
     SDAnimatedImageView *imageView = [SDAnimatedImageView new];