动画完成后执行 segue

Question

我正在尝试在动画完成后执行转场。这是我在 viewDidAppear 中的代码：

    override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    imageViewAnimated.startAnimating()


    if label.center != CGPoint(x:50, y:10) {

        UIView.animateWithDuration(2.0, delay: 0.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: { () -> Void in
            self.label.center = self.view.center

            }, completion: nil)

        UIView.animateWithDuration(0.5, delay: 0.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: { () -> Void in
            //                self.label.center = CGPoint(x: 50,y:300)
            self.label.alpha = 0.0

            }, completion: nil)
    }

    if label.alpha == 0.0 {
        UIView.animateWithDuration(0.5, delay: 10.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: { () -> Void in

            self.performSegueWithIdentifier("backSegue", sender: self)

            }, completion: nil)
    }
}

所以基本上我有一个向下移动并淡出的标签（第一个和第二个 animateWithDuration），然后我希望在标签淡出并且其他动画完成后发生 Segue。现在 segue 正在发生，但它会立即执行，无论我增加多少延迟都不会等待。

Answer 1

运行完成后的 segue 代码。您必须在 "Completion" 块上对其进行编码。方法完成动画后将调用完成块

 UIView.animateWithDuration(0.5, delay: 10.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: { () -> Void in

               //if you perform segue here if will perform with animation

                }, completion: { finished in

      //if you perform segue it will perform after it finish animating.

     self.performSegueWithIdentifier("backSegue", sender: self)


    })

Answer 2

您在错误的地方调用了 segue。你想要这样的东西：

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    imageViewAnimated.startAnimating()

    if label.center != CGPoint(x:50, y:10) {
        UIView.animateWithDuration(2.0, delay: 0.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: { () -> Void in
            self.label.center = self.view.center
        }, completion: nil)

        UIView.animateWithDuration(0.5, delay: 0.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: { () -> Void in
            //                self.label.center = CGPoint(x: 50,y:300)
            self.label.alpha = 0.0
        }, completion: { finished in
            self.performSegueWithIdentifier("backSegue", sender: self)
        })
    }
}

Answer 3

您可以在动画块的完成处理程序部分编写导航代码，因为完成处理程序将在动画完成后触发。

[UIView animateWithDuration:0.25 animations:^{
    //Animation changes
} completion:^(BOOL finished) {
    //Navigation
}];

动画完成后执行 segue

Performing a segue after animation is finished

uiviewanimation

ios

segue

swift