Shake Animation for a given view in iOS. (source: http://2cupsoftech.wordpress.com/2012/09/20/shake-animation-to-a-uiview-or-uibutton/)

Shake Animation iOS

- (void) startShake:(UIView*)view
{
    CGAffineTransform leftShake = CGAffineTransformMakeTranslation(-5, 0);
    CGAffineTransform rightShake = CGAffineTransformMakeTranslation(5, 0);
    
    view.transform = leftShake;  // starting point
    
    [UIView beginAnimations:@"shake_view" context:view];
    [UIView setAnimationRepeatAutoreverses:YES]; // important
    [UIView setAnimationRepeatCount:5];
    [UIView setAnimationDuration:0.06];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(shakeEnded:finished:context:)];
    
    view.transform = rightShake; // end here & auto-reverse
    
    [UIView commitAnimations];
}

- (void) shakeEnded:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
    if ([finished boolValue]) {
        UIView* item = (UIView *)context;
        item.transform = CGAffineTransformIdentity;
    }
}