如何解决:iOS 13.0 中不推荐使用“keyWindow" [英] How to resolve: 'keyWindow' was deprecated in iOS 13.0

问题描述

我将 Core Data 与 Cloud Kit 一起使用，因此必须在应用程序启动期间检查 iCloud 用户状态.如果出现问题，我想向用户发出一个对话框，并且我使用 UIApplication.shared.keyWindow?.rootViewController?.present(...) 到现在为止.

I'm using Core Data with Cloud Kit, and have therefore to check the iCloud user status during application startup. In case of problems I want to issue a dialog to the user, and I do it using UIApplication.shared.keyWindow?.rootViewController?.present(...) up to now.

在 Xcode 11 beta 4 中，现在有一条新的弃用消息，告诉我:

In Xcode 11 beta 4, there is now a new deprecation message, telling me:

'keyWindow' 在 iOS 13.0 中已弃用:不应用于支持多个场景的应用程序，因为它会在所有连接的场景中返回一个关键窗口

'keyWindow' was deprecated in iOS 13.0: Should not be used for applications that support multiple scenes as it returns a key window across all connected scenes

我应该如何显示对话框?

How shall I present the dialog instead?

推荐答案

这是我的解决方案:

let keyWindow = UIApplication.shared.connectedScenes
        .filter({$0.activationState == .foregroundActive})
        .compactMap({$0 as? UIWindowScene})
        .first?.windows
        .filter({$0.isKeyWindow}).first

用法例如:

keyWindow?.endEditing(true)

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