Cannot preview in this file - active scheme does not build this file : SwiftUI on Xcode 11 in CatalinaOS

Question

I opened Landmark App using SwiftUI on Xcode 11 in macOS Catalina(10.15) and while opening the Canvas Editor for .swift files containing SwiftUI is showing

Answer 1

In the schemes I was able to select, it contained only one scheme. Reopening the folder in a folder that's not in the Downloads directory made live editing work for me

Answer 2

If this is a new project coming from a copied folder and inside an iCloud folder, just close Xcode and relaunch it. The sync was not yet done.

Answer 3

I experienced the same issue. All I did was to copy the "StartingPoint" folder out of the downloaded folder and relaunched the project. It worked!!!

Answer 4

I encountered the same error for some of my SwiftUI View files when trying to preview on Canvas. What fixed the issue was I copied the code within the current file, deleted the file, created a new SwiftUI View file under the same name and pasted the original code. Hope that helps!

Creating a new folder in Documents/Desktop and copying the files over also resolves the issue.

Answer 5

Select the Scheme that has the current file to Preview