iOS Xcode 12.0 Swift 5'AppDelegate'带有@main注释，并且必须提供类型为()->的主要静态函数.无效或()引发->空白 [英] iOS Xcode 12.0 Swift 5 'AppDelegate' is annotated with @main and must provide a main static function of type () -> Void or () throws -> Void

问题描述

在使用Swift 5和Catalina 10.15.5的Xcode 12.0中:当我将Mac标记为可部署目标(Apple Project Catalyst)并单击运行"时，它给我一个错误，显示:

In my Xcode 12.0 using Swift 5 and Catalina 10.15.5: When I tick Mac as deployable target (Apple Project Catalyst), and click Runs, it gives me an error showing:

'AppDelegate' is annotated with @main and must provide a main static function of type () -> Void or () throws -> Void.

在Internet上找不到任何内容...我已经检查了我的代码，没有任何问题，它可以在iOS设备和模拟器上运行.调试日志为空(duhh ...)

Can't find anything on Internet... I have checked my codes and nothing's wrong and it can be run on iOS devices and simulators. Debug log is empty (duhh...)

有人遇到这个问题吗?

推荐答案

将 @main 更改为 @UIApplicationMain ，并忽略所有由此产生的警告.

Change @main to @UIApplicationMain and ignore any resulting warnings.

来源: https://developer.apple.com/documentation/xcode-release-notes/xcode-12-release-notes

启用Mac Catalyst后，可能无法再使用Swift语言新建的iOS项目.(67885114)

A newly-created iOS project using the Swift language may no longer build after enabling Mac Catalyst. (67885114)

解决方法:将应用程序委托上的 @main 注释替换为 @UIApplicationMain .

Workaround: Replace the @main annotation on the App Delegate with @UIApplicationMain.

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