Question

I’m trying to animate an image to rotate left and right when selected, basically to let the user which the object they’re touching.

I found some code for animating:

- (void)rotateImage:(UIImageView *)image duration:(NSTimeInterval)duration 
              curve:(int)curve degrees:(CGFloat)degrees delay:(CGFloat)delay
{
    // Setup the animation
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDelay:delay];
    [UIView setAnimationDuration:duration];
    [UIView setAnimationCurve:curve];
    [UIView setAnimationBeginsFromCurrentState:YES];

    // The transform matrix
    CGAffineTransform transform = 
    CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(degrees));
    image.transform = transform;

    // Commit the changes
    [UIView commitAnimations];
}

However, when I try to run two animations, only the last one ever works. Even with a proper delay, only the second animation will show:

[self rotateImage:self duration:.5 
                curve:UIViewAnimationCurveEaseIn degrees:60 delay:0];
    [self rotateImage:self duration:.5 
                curve:UIViewAnimationCurveEaseIn degrees:-60 delay:5];

What can I do to create the animation so it rotates left, then rotates right?

Answer 1

[UIView animateWithDuration:0.2 animations:^{
// animation left
    [UIView setAnimationDelay:10];

    } completion:^(BOOL finished){

[UIView animateWithDuration:0.2 animations:^{
       // animation right
    } completion:^(BOOL finished){
       // done
    }];

    }];

found it here

https://developer.apple.com/library/content/featuredarticles/Short_Practical_Guide_Blocks/