Shake Animation

shake.swift

func shakeView(view: UIView, completion:((success: Bool) -> Void)?) {
    UIView.animateKeyframesWithDuration(0.5,
        delay: 0,
        options: UIViewKeyframeAnimationOptions.BeginFromCurrentState,
        animations: {
            UIView.addKeyframeWithRelativeStartTime(0, relativeDuration: 1/4, animations: {
                view.transform = CGAffineTransformMakeTranslation(-5, 0)
            })
            UIView.addKeyframeWithRelativeStartTime(1/4, relativeDuration: 1/4, animations: {
                view.transform = CGAffineTransformMakeTranslation(5, 0)
            })
            UIView.addKeyframeWithRelativeStartTime(2/4, relativeDuration: 1/4, animations: {
                view.transform = CGAffineTransformMakeTranslation(-5, 0)
            })
            UIView.addKeyframeWithRelativeStartTime(3/4, relativeDuration: 1/4, animations: {
                view.transform = CGAffineTransformMakeTranslation(5, 0)
            })
        },
        completion: { (success: Bool) -> Void in
            completion!(success: success)
        }
    )
}