UIImageView缩放/淡化动画？

Question

I want to make a little zoom/fade animation for when the UIImageView shows up in my view, I already have the code for the fade effect:

    banner.alpha = 0.0;
    [UIView animateWithDuration:2.0 animations:^{
        banner.alpha = 1.0;
    }];

Now I want to know if there is another easy way to combine the fade effect with a little zoom effect, like the image becoming larger and filling up the frame as it fades in? Any ideas? Thanks!

Answer 1

you can use CG_EXTERN CGAffineTransform CGAffineTransformMakeScale(CGFloat sx, CGFloat sy) to do the zoom effect

such as

banner.alpha = 0.0;

[UIView animateWithDuration:2.0 animations:^{
    banner.alpha = 1.0;
    banner.transform =CGAffineTransformMakeScale(1.3,1.3);
}];

Answer 2

You can also use the frame

banner.alpha = 0;

[UIView animateWithDuration:2.0f animations:^(void){
   banner.alpha = 1.0f;
   [banner setFrame:CGRectMake(0, 0, 1024, 748)];
}];

// With Completion
[UIView animateWithDuration:0.1f animations:^(void){
   banner.alpha = 1.0f;
   [banner setFrame:CGRectMake(0, 0, 1024, 748)];
}completion:^(BOOL finished) {

}];