Merge pull request #3636 from dreampiggy/bugfix/ios17_animatedimageview_render_issue_background_foreground

Fix the iOS 17 UIKit issue that UIImageView entering the background will reset CALayer's contents, which cause SDAnimatedImageView render issue (out-of-sync)

SDWebImage/Core/SDAnimatedImageView.m

@@ -501,6 +501,17 @@
     }
 }
 
+#if SD_UIKIT
+- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
+    // See: #3635
+    // From iOS 17, when UIImageView entering the background, it will receive the trait collection changes, and modify the CALayer.contents by `self.image.CGImage`
+    // However, For animated image, `self.image.CGImge != self.currentFrame.CGImage`, right ?
+    // So this cause the render issue, we need to reset the CALayer.contents again
+    [super traitCollectionDidChange:previousTraitCollection];
+    [self.imageViewLayer setNeedsDisplay];
+}
+#endif
+
 #if SD_MAC
 // NSImageView use a subview. We need this subview's layer for actual rendering.
 // Why using this design may because of properties like `imageAlignment` and `imageScaling`, which it's not available for UIImageView.contentMode (it's impossible to align left and keep aspect ratio at the same time)