Bug about UIImageView display gif?

Question

I create a UIImageView and add to VC UIView , then I create a image with animatedImageWithImages:duration:

When I execute the code, it works normally. It displays image animation. But when I push to next VC and in the process of swipe back , I find the UIImageView display nothing. At the moment finger left screen , everything back to normal.

Here is my code:

- (void)viewDidLoad {
     [super viewDidLoad];               
     UIImageView *imgView = [[UIImageView alloc] init];
     imgView.backgroundColor = [UIColor orangeColor];
     imgView.frame = CGRectMake(20, 200, 80, 80);
     [self.view addSubview:imgView];     
     NSArray *imgs = @[[UIImage imageNamed:@"img1"],[UIImage imageNamed:@"img2"]];
     imgView.image = [UIImage animatedImageWithImages:imgs duration:0.5];
}

BugGif

I notice the imageView has CAKeyframeAnimation. I guess the conflict that runmode and CAKeyframeAnimation.

SDWebImage has the same problem. Because it also use the method that create UIImage. I think the point is the method of animatedImageWithImages:duration: and CAKeyframeAnimation.

Anyone knows the solution? Thanks a lot.

The event that the finger left the screen will make imageView display normally. Why and How to resolve?

GitHubBugDemo

Answer 1

You can use UIImageView another methods to set images and animation duration as below

UIImageView *imgView = [[UIImageView alloc] init];
imgView.backgroundColor = [UIColor orangeColor];
imgView.frame = CGRectMake(20, 200, 80, 80);
NSArray *imgs = @[[UIImage imageNamed:@"img1"],[UIImage imageNamed:@"img2"]];
[imgView setAnimationImages:imgs];
[imgView setAnimationDuration:1];
[imgView setAnimationRepeatCount:HUGE_VAL];
[imgView startAnimating];
[self.view addSubview:imgView];