UIView+Shake.swift

import UIKit

extension UIView
{

	func shake()
	{
		let shakeAngle = (5 * M_PI) / 360

		let shakeRotation = CAKeyframeAnimation(keyPath: "transform.rotation")
		shakeRotation.values = [0, shakeAngle, 0, -shakeAngle, 0]
		shakeRotation.duration = 0.3
		shakeRotation.repeatCount = 2
		self.layer.addAnimation(shakeRotation, forKey: "shake")
	}

}