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SwiftUI Canvas：自动预览更新暂停，无法恢复

[英]SwiftUI Canvas: Automatic Preview Updating Paused, Can't resume

原文 2022-01-27 21:36:11 2 1 swift/ canvas/ swiftui/ preview

I'm working on my app in XCode 13, with a target deployment of iOS 13. I'm trying to implement SwiftUI, but all Canvases refuse to load.我正在 XCode 13 中开发我的应用程序，目标部署为 iOS 13。我正在尝试实现 SwiftUI，但所有画布都拒绝加载。 If I select Resume, the preview will pause again without ever loading.如果我 select 恢复，预览将再次暂停而不会加载。 There are no error messages, the preview just pauses again.没有错误消息，预览只是再次暂停。

I found a similar question on here, but none of the solutions have worked for me.我在这里发现了一个类似的问题，但没有一个解决方案对我有用。 My account isn't at the level yet where I could leave a comment on it.我的帐户还没有达到可以发表评论的水平。

So far I have tried the following:到目前为止，我已经尝试了以下方法：

Set Enable Previews in build settings to "Yes"将构建设置中的启用预览设置为“是”
Checked off "For install builds only" on all possible items in Build Phases在构建阶段中的所有可能项目上勾选“仅用于安装构建”
Wrapped build phases scripts in an if statement to check if Previews are enabled在 if 语句中包装构建阶段脚本以检查是否启用了预览
Made a clean build, cleared all derived data.进行了干净的构建，清除了所有派生数据。
Deleted local repository copy and reinstalled from GitHub删除本地存储库副本并从 GitHub 重新安装
Restarted computer重新启动计算机
added #if DEBUG and #endif to preview code添加了#if DEBUG 和#endif 来预览代码
Made sure Xcode is not in Legacy Build system.确保 Xcode 不在旧版构建系统中。

Other Info:其他信息：

App does not use CoreData, and the previews do not involve API calls. App不使用CoreData，预览版不涉及API调用。
App is rather large, its size might have something to do with it?应用程序比较大，可能与它的大小有关？
Xcode will not even show preview for basic "Hello World." Xcode 甚至不会显示基本“Hello World”的预览。 default SwiftUI view.默认 SwiftUI 视图。

I'm kind of at a loss at this point as to what else to try.在这一点上，我有点不知所措，不知道还能尝试什么。

Please let me know if you have any other questions or suggestions.如果您有任何其他问题或建议，请告诉我。

1 个解决方案

Creating a new SwiftUI file was the only thing that worked for me.创建一个新的 SwiftUI 文件是唯一对我有用的东西。 You can delete it again after the preview recompiles.您可以在预览重新编译后再次删除它。

Take a look at the process SimRenderServer in activity monitor, I think it's this run that Xcode has to relaunch.看看活动监视器中的SimRenderServer进程，我认为 Xcode 必须重新启动这个运行。