Method to shake a view with a completion block

shake.m

- (void)shakeView:(UIView *)view completion:(void (^)(void))completion {
    [UIView animateKeyframesWithDuration:.5 delay:0 options:UIViewKeyframeAnimationOptionBeginFromCurrentState animations:^{
        [UIView addKeyframeWithRelativeStartTime:0 relativeDuration:.25 animations:^{
            view.transform = CGAffineTransformMakeTranslation(-5, 0);
        }];

        [UIView addKeyframeWithRelativeStartTime:.25 relativeDuration:.25 animations:^{
            view.transform = CGAffineTransformMakeTranslation(5, 0);
        }];

        [UIView addKeyframeWithRelativeStartTime:.5 relativeDuration:.25 animations:^{
            view.transform = CGAffineTransformMakeTranslation(-5, 0);
        }];

        [UIView addKeyframeWithRelativeStartTime:.75 relativeDuration:.25 animations:^{
            view.transform = CGAffineTransformMakeTranslation(0, 0);
        }];
    } completion:^(BOOL finished) {
        if (finished && completion) {
            completion();
        }
    }];
}