UIView transitionFromView not animating in container

Question

I'm using UIView transitionFromView to flip between two views. I'm currently doing the following in a UIView subclass:

UIImageView *imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"img.png"]];

imgView.frame = CGRectMake(0, 0, 100, 100);

UIView *detailView = [[UIView alloc] initWithFrame:imgView.frame];
detailView.backgroundColor = [UIColor redColor];

detailView.frame = imgView.frame;

[self addSubview:imgView];

[UIView transitionFromView:imgView toView:detailView duration:1.0 
                   options:UIViewAnimationOptionTransitionFlipFromLeft
                completion:^(BOOL finished){

                }
 ];

This works as expected. The transition performs as it should. The issue is that I need the transition to take place in a subview of the view that the previous code is contained within. So, I put everything in a container and try to animate that:

UIImageView *imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"img.png"]];

imgView.frame = CGRectMake(0, 0, 100, 100);

UIView *container = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 500, 500)];
UIView *detailView = [[UIView alloc] initWithFrame:imgView.frame];
detailView.backgroundColor = [UIColor redColor];

detailView.frame = imgView.frame;

[container addSubview:imgView];

[self addSubview:container];

[UIView transitionFromView:imgView toView:detailView duration:1.0 
                   options:UIViewAnimationOptionTransitionFlipFromLeft
                completion:^(BOOL finished){

                }
 ];

But in this case, the animation doesn't run. Instead, I only see the final result without the transition. Can anyone help me figure out how the two cases differ?

The same problem is described here, but I don't feel the existing 'solution' is sufficient to fully describe this behavior. Transition behavior using transitionFromView and transitionWithView

Andrew Andrew · Accepted Answer · 2013-12-23T16:57:28

Consider delaying the animation to another run loop, using dispatch_after and performSelector:withObject:afterDelay:

or use [CATransaction flush] after you add the subviews

More info at http://andrewmarinov.com/working-with-uiviews-transition-animations/

UIView transitionFromView not animating in container

2 Answers