Question

Hi guys I am trying to bring back an image automatically after it has faded to alpha 0, but cannot figure it out.

[UIImageView beginAnimations:nil context:NULL];

[UIImageView setAnimationDuration:4.0];

[_imageflushdownwater setAlpha:0];
self.imageflushdownwater.transform = CGAffineTransformRotate(_imageflushdownwater.transform, M_PI / 1);
[UIImageView commitAnimations];

Thanks in advance.

Answer 1

You don’t have to figure out, it would have been enough to read through UIView’s class reference… (Please! Pretty please!)

Anyways…

Using the old, class-based API (that’s what you are using):

[UIView setAnimationTarget:self];
[UIView setAnimationDidStopSelector:@selector(animationFinished:completed:context:)];


- (void)animationFinished:(NSString *)name completed:(NSNumber *)completed context:(void *)ctx
{
    imageView.alpha = 1.0f;
    imageView.transform = CGAffineTransformIdentity;
}

Using the new, block-based API (that’s what you should be using):

[UIView animateWithDuration:4.0 animations:^{
    imageView.alpha = 0.0;
    imageView.transform = CGAffineTransformMakeRotation(M_PI);
} completion:^{
    imageView.alpha = 1.0f;
    imageView.transform = CGAffineTransformIdentity;
}];