Xcode 11 Beta 3，构建错误“Unknown attribute 'State'"，“Use of undeclared type 'View'"等等 [英] Xcode 11 Beta 3, build error "Unknown attribute 'State'", "Use of undeclared type 'View'" etc

问题描述

我使用 Xcode 11 的第二个测试版构建了一个应用程序，使用 SwiftUI，一切正常，但是现在，使用第三个测试版，该应用程序甚至没有构建.我收到诸如使用未声明的类型‘视图’"、未知属性‘状态’"等错误.我该怎么办?是我的代码有问题还是只是一个错误?

I build an app with the 2nd beta of Xcode 11, using SwiftUI, and everything worked completely fine, but now, with the 3rd beta, the app isn't even build. I get errors like "Use of undeclared type 'View'", "Unknown attribute 'State'" etc. What can I do? Is the problem in my code or is it just a bug?

问题是当我尝试构建应用程序以在我的 Mac 上运行时(使用 UIKit for Mac)

@State var score = 0

错误是未知属性'状态'"

The error is "Unknown attribute 'State'"

struct ContentView : View {
    /*...*/
}

错误是使用未声明的类型'视图'"

The error is "Use of undeclared type 'View'"

推荐答案

这是来自 Xcode 11Beta 3 发行说明.

• Xcode 11 不支持在引入 macOS 的 iPad 应用中使用 SwiftUI.(41416222, 51201699)

我自己下载了 Xcode 11 Beta 3 只是为了确认您提到的错误，并且在尝试为 Mac 构建 SwiftUI 项目时遇到了同样的问题.

I downloaded the Xcode 11 Beta 3 myself just to confirm the errors you mentioned, and I had the same issues when trying to build a SwiftUI project for Mac.

如果可能，我建议重新使用 Xcode Beta 2.不幸的是，Apple 不提供以前测试版的下载链接，因此希望您的计算机上仍安装有 Time Machine 备份或 Beta 2.否则，在下一个测试版发布之前，您可能会倒霉.

I would suggest going back to using Xcode Beta 2 if possible. Unfortunately, Apple doesn't provide download links to previous betas, so hopefully you have a Time Machine backup or Beta 2 still installed on your computer. Otherwise, you might be out of luck until the next beta is released.

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