如何检查SwiftUI是否处于预览模式? [英] How do you check if SwiftUI is in preview mode?

问题描述

是否可以检查SwiftUI应用是否处于预览模式?例如，您可以使用#if DEBUG检查您的应用程序是处于开发模式还是生产模式.您可以执行类似的操作来检查是否正在预览吗?

Is there a way to check if a SwiftUI app is in preview mode? For example, you can check if your app is in development or production mode using #if DEBUG. Can you do something similar to check if you're previewing or not?

推荐答案

您可以使用ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"]进行检测.在画布上运行时，该值将在运行时为"1".

You can detect this using ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"]. The value will be "1" at runtime when running in the canvas.

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