let shutterButton = KYShutterButton(
    frame: CGRectMake(20, 20, 100, 100),
    shutterType: .Normal,
    buttonColor: UIColor.redColor()
)
shutterButton.addTarget(self,
    action: "didTapButton:",
    forControlEvents: .TouchUpInside
)
/* Custom
shutterButton.arcColor      = UIColor.greenColor()
shutterButton.progressColor = UIColor.yellowColor()
*/
view.addSubview(shutterButton)


func didTapButton(sender: KYShutterButton) {
    switch sender.buttonState {
    case .Normal:
        sender.buttonState = .Recording
    case .Recording:
        sender.buttonState = .Normal
    }
}