ios - 在 Swift 中设置自定义 segue 方式(从顶部到按钮的方向)

Question

我想在 Storyboard 中的两个场景之间建立一个 segue，其行为与“Apple Keynote”效果完全相同(从上到下方向)。现在我知道有一种称为模态转场的转场，但它在自下而上的方向上起作用。

请帮帮我!

我做了一个视频，我想要什么样的segue，请看一下! https://www.dropbox.com/s/zqyxrm638ellfbx/whatiwant.mov?dl=0

Answer 1

您可以像这样实现自定义 UIStoryboardSegue:

class TopDownSegue: UIStoryboardSegue {
    let duration: NSTimeInterval = 1
    let delay: NSTimeInterval = 0
    let animationOptions: UIViewAnimationOptions = [.CurveEaseInOut]

    override func perform() {
        // get views
        let sourceView = sourceViewController.view
        let destinationView = destinationViewController.view

        // get screen height
        let screenHeight = UIScreen.mainScreen().bounds.size.height
        destinationView.transform = CGAffineTransformMakeTranslation(0, -screenHeight)

        // add destination view to view hierarchy
        UIApplication.sharedApplication().keyWindow?.insertSubview(destinationView, aboveSubview: sourceView)

        // animate
        UIView.animateWithDuration(duration, delay: delay, options: animationOptions, animations: { 
            destinationView.transform = CGAffineTransformIdentity
            }) { (_) in
                self.sourceViewController.presentViewController(self.destinationViewController, animated: false, completion: nil)
        }
    }
}

并在 Storyboard中使用您的新自定义转场: