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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
Cannot preview in this file - active scheme does not build this file
Try Again, Diagonistics option or restarting Xcode not solving the problem.
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You can also create new preview structures in an existing SwiftUI view file by choosing Editor > Create Preview. For the complete list of preview customizations, see Previews in Xcode.
There are two shortcuts that you should remember. Both of them will make your life easier during the development cycle of your SwiftUI views. Cmd + Option + Enter shows or hides previews. Cmd + Option + P runs the previews.
SwiftUI is more than a framework. It is integrated into Xcode, enabling developers to build user interfaces much faster than ever before.
Choose File > New > File, select iOS as the platform, select the “SwiftUI View” template, and click Next. Name the new file MapView. swift and click Create.
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.
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Select the Scheme that has the current file to Preview
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