Swift无法从上到下呈现视图控制器

Question

在我的应用程序中，我必须从上到下呈现屏幕，我尝试了下面的代码，它给出了相同的正常呈现风格。

        let screen = self.storyboard?.instantiateViewController(withIdentifier: "Screen1p5") as? Screen1p5
        let transition = CATransition()
        transition.duration = 0.5
        transition.type = kCATransitionPush
        transition.subtype = kCATransitionFromTop
        view.window!.layer.add(transition, forKey: kCATransition)
        self.present(screen!, animated: true, completion: nil)

Answer 1

为此，您需要将subtype CATransition设置为kCATransitionFromBottom，将面糊动画设置animated设置为false present(_:animated:completion:)。< / p>

let screen = self.storyboard?.instantiateViewController(withIdentifier: "Screen1p5") as? Screen1p5
let transition = CATransition()
transition.duration = 0.5
transition.type = kCATransitionPush
transition.subtype = kCATransitionFromBottom
view.window!.layer.add(transition, forKey: kCATransition)
self.present(screen!, animated: false, completion: nil)

将subtype的{​​{1}}设置为CATransition。

kCATransitionFromTop

Answer 2

刚刚将其transition.subtype更改为kCATransitionFromBottom

  

transition.subtype = kCATransitionFromBottom

关闭控制器。

let transition = CATransition()
transition.duration = 0.5
transition.type = kCATransitionPush
transition.subtype = kCATransitionFromTop
view.window!.layer.add(transition, forKey: kCATransition)
self.dismiss(animated: true, completion: nil)

请查看以下GIF表示。

  

如果您使用的是.XIB，请找到以下代码。

目前是控制器。

let newController = NewViewController(nibName: "NewView", bundle: nil)
let transition = CATransition()
transition.duration = 0.5
transition.type = kCATransitionPush
transition.subtype = kCATransitionFromBottom
view.window!.layer.add(transition, forKey: kCATransition)
self.present(newController, animated: true, completion: nil)

关闭控制器。它与上面的代码相同。

let transition = CATransition()
transition.duration = 0.5
transition.type = kCATransitionPush
transition.subtype = kCATransitionFromTop
view.window!.layer.add(transition, forKey: kCATransition)
self.dismiss(animated: true, completion: nil)