Search code examples
iosswiftxcodeif-statementswiftui

How do you check if SwiftUI is in preview mode?

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?

Solution

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