如何用動畫結束UILongPressGestureRecognizer？

Question

我使用UILongPressGestureRecognizer為UIImageView設置了動畫， UILongPressGestureRecognizer所示：

override func viewDidAppear(animated: Bool) {

        var longPress = UILongPressGestureRecognizer(target: self, action: Selector("longPress"))
        imageView.addGestureRecognizer(longPress)
        imageView.userInteractionEnabled = true
    }

    func longPress()
    {
        let bounds = self.imageView.bounds
        UIView.animateWithDuration(0.5, animations: {
            self.imageView.bounds = CGRect(x: bounds.origin.x, y: bounds.origin.y, width: bounds.size.width + 22, height: bounds.size.height + 22)
        })

        println("user pressed on image")
    }

動畫只會導致UIImageview的高度和寬度在longPress上展開，但是當釋放按下時，邊界會繼續增長。當釋放按下時，如何將UIImageView的邊界返回到原點寬度和高度？

Answer 1

嘗試這個：

var oldbounds:CGRect!
@IBOutlet var image: UIImageView!
override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func viewDidAppear(animated: Bool) {

    var longPress = UILongPressGestureRecognizer(target: self, action: Selector("longPress:"))
    longPress.minimumPressDuration = 0.01
    image.addGestureRecognizer(longPress)
    image.userInteractionEnabled = true
}

func longPress(gesture:UILongPressGestureRecognizer)
{
    if gesture.state == UIGestureRecognizerState.Began
    {
        oldbounds = self.image.bounds
    }
    else if gesture.state == UIGestureRecognizerState.Changed
    {
        let bounds = self.image.bounds
        UIView.animateWithDuration(0.5, animations: {
            self.image.bounds = CGRect(x: bounds.origin.x, y: bounds.origin.y, width: bounds.size.width + 22, height: bounds.size.height + 22)
        })

        println("user pressed on image")
    }
    else
    {
        let bounds = self.image.bounds
        UIView.animateWithDuration(0.5, animations: {
            self.image.bounds = self.oldbounds
        })

        println("user release on image")
    }
}