Change UIImageView image half way of a flip animation
animation, cgaffinetransform, ios, objective-c, uiview
Solution
You can use `UIView` class method `+ (void)transitionWithView:duration:options:animations:completion:` for this animation easily.
Use code like this for your animation:
[UIView transitionWithView:imageView
duration:0.4
options:UIViewAnimationOptionTransitionFlipFromRight
animations:^{
// Set the new image
// Since its done in animation block, the change will be animated
imageView.image = newImage;
} completion:^(BOOL finished) {
// Do whatever when the animation is finished
}];
You can set direction of flip by replacing `UIViewAnimationOptionTransitionFlipFromRight` with any of the following options:
UIViewAnimationOptionTransitionFlipFromLeft
UIViewAnimationOptionTransitionFlipFromRight
UIViewAnimationOptionTransitionFlipFromTop
UIViewAnimationOptionTransitionFlipFromBottom
Problem
How can I change the image of a UIImageView on half way of a Flip animation. My code does seem to flip the UIImageView and successfully change the image but it is changing in an instant. What I want to achieve is to only change the image once the 180 flip reaches the 90 degree flip. Here is my code: Create UIImageView on view: ``` UIImage *image = [UIImage imageNamed:@"fb1.jpg"]; imageView = [[UIImageView alloc] initWithImage:image]; vw = [[UIView alloc] initWithFrame:CGRectMake(20, 20, 80, 80)]; vw.layer.cornerRadius = vw.frame.size.width / 2; imageView.frame = CGRectMake(20, 20, 80, 80); imageView.layer.cornerRadius = imageView.frame.size.width / 2; imageView.layer.masksToBounds = YES; imageView.layer.borderColor = [[UIColor blackColor] CGColor]; imageView.layer.borderWidth = 1.0; [self.view addSubview: imageView]; //[self.view addSubview:vw]; [imageView setUserInteractionEnabled:YES]; UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(taptap:)]; [imageView addGestureRecognizer:tap]; ``` Animate UIImageView on Tap: ``` [UIView animateWithDuration:2.0 delay:0.0 options:UIViewAnimationOptionCurveEaseInOut animations:^(void) { imageView.transform = CGAffineTransformMakeScale(-1, 1); [UIView animateWithDuration:1.0 delay:1.0 options:UIViewAnimationOptionTransitionCrossDissolve animations:^(void) { imageView.image = [UIImage imageNamed:@"fb2.jpg"]; } completion:^(BOOL finished) { }]; } completion:^(BOOL finished) { }]; ``` Also, I am doing this animation on a tap gesture on the specific UIImageView.