CODEWITHSUNDEEP
iosobjective-canimationuiimageviewuianimation
user-44651
user-44651

Reputation: 4124

Animation not working on UIImageView

I have a UIImageView added as a subview. I am trying to animate it using transform. The animation doesn't, however the imageview is Scaled properly, it's just not auto reversing. Am I doing something wrong?

UIImageView * iv_tap = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"gesture_tap"]];
    iv_tap.center = point;
    iv_tap.tag = 779;
    iv_tap.hidden = true;
    [UIView animateWithDuration:2.0
                          delay:.05
                        options: UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat | UIViewAnimationOptionCurveLinear
                     animations:^{
                         iv_tap.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.8, 1.8);
                     }
                     completion:NULL];


    [self addSubview:iv_tap];

Upvotes: 1

Views: 755

Answers (1)

Teja Nandamuri
Teja Nandamuri

Reputation: 11201

You need to do the animation after you add the imageView into the view. If you do the animation before the addSubView where at point, the image view is not in the view heirarchy and you can't see any animation.

 UIImageView * iv_tap = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"gesture_tap"]];
[self.view addSubview:iv_tap];   //this could be self in your case
iv_tap.tag = 779; 

[UIView animateWithDuration:2.0 delay:0.05  options:UIViewAnimationOptionCurveEaseOut animations:^{

    iv_tap.center=self.view.center;
    iv_tap.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.8, 1.8);

    [self.view layoutIfNeeded];    //this could be self in your case

} completion:^(BOOL finished) {
        //do your stuff when animation is done
}];

If you are subclassing a UIView, then you can even put this in the drawRect method:

UIImageView * iv_tap = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"gesture_tap"]];
[self addSubview:iv_tap];   
iv_tap.tag = 779;

[UIView animateWithDuration:2.0 delay:0.05  options:UIViewAnimationOptionCurveEaseOut animations:^{

    iv_tap.center=self.center;
    iv_tap.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.8, 1.8);

    [self layoutIfNeeded];   

} completion:^(BOOL finished) {
        //do your stuff when animation is done
 }];

Upvotes: 1

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