如何获得多窗口SceneDelegate Xcode 11的当前等效键窗口? [英] How get current keywindow equivalent for multi window SceneDelegate Xcode 11?

问题描述

我正在将iPadOS的iOS13应用程序转换为SceneDelegate(多窗口).

I'm converting my iOS13 app for iPadOS to SceneDelegate (multi window).

如何从当前的SceneDelegate获取当前的UIWindow?

How can I get the current UIWindow from the current SceneDelegate?

我知道a可以使用UIView.window或UIViewController.view.window访问当前场景，但是我有一个非UI类(AppDelegate)，我需要在其中获取窗口(直到iOS12之前为keyWindow)才能在顶部显示小吃店一切.

I know that a can access the current scene using UIView.window or UIViewController.view.window, but I have a non UI class (AppDelegate) where I need to get the window (keyWindow until iOS12) to show a snack bar on top of everything.

我曾经做过[UIApplication sharedApplication].keyWindow，但是现在，那当然是错误的.

I used to do [UIApplication sharedApplication].keyWindow but now, of course, that's wrong.

推荐答案

Swift 5.x/iOS 13.x

受许多解决方案的启发，找回旧的窗口属性(在connectedScenes中搜索)，我实现了一些扩展:

Swift 5.x / iOS 13.x

Inspired by many solutions, to get back my old window property (searching it inside the connectedScenes) I've realized a little extension:

extension UIApplication {
    var currentWindow: UIWindow? {
        connectedScenes
        .filter({$0.activationState == .foregroundActive})
        .map({$0 as? UIWindowScene})
        .compactMap({$0})
        .first?.windows
        .filter({$0.isKeyWindow}).first
    }
}

---

用法:

if let window = UIApplication.shared.currentWindow { 
   // do whatever you want with window
}

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