Question

我想在动画结束后尝试执行一个segue。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逐渐消失的标签（第一个和第二个animateWithDuration），然后我希望在标签淡出并完成另一个动画之后发生Segue。现在segue正在发生，但它立刻就会发生，并且无论我多大程度地增加延迟都不会等待。

Answer 1

你在错误的地方调用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 2

完成后运行您的segue代码。你必须在＆＃34;完成＆＃34;上编码。块。在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 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
}];

动画结束后执行segue

3 个答案: