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Stop the animation while it is in progress?

Hi I have a simple image that I animate (move horizontally) on the screen from startLoc to endLoc. The animation happens when the user clicks on the Animate button (which triggers the animate action). The animation happens during 6 seconds (I set duration=6.0). There is also a Kill button (which triggers the kill action). What I want is to kill the animation while in progress. I tried to do it by setting location of the image outside screen, but it did not work. How What should I do in order stop the animation while it is in progress?


- (IBAction)animate:(id)sender
{
    position.origin.x = startLoc;
    [view setFrame:position];
    position.origin.x = endLoc;
    [NSAnimationContext beginGrouping];
    [[NSAnimationContext currentContext] setDuration:duration];
    [[view animator] setFrame:position];
    [NSAnimationContext endGrouping];
}

- (IBAction)kill:(id)sender
{
    position.origin.x = startLoc;
    [[view animator] setFrame:position];
}
@end





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