ios - 如何用动画结束 UILongPressGestureRecognizer？

Question

我用 UILongPressGestureRecognizer 为 UIImageView 设置了动画，如下所示:

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")
    }

动画只是导致 UIImageview 的高度和宽度在 longPress 上扩展，但是当按下时，边界继续增长。如何在按下时将 UIImageView 的边界返回到原点宽度和高度释放了吗？

Answer 1

试试这个:

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")
    }
}