Xcode Canvas for Swiftui Previews Does Not Show Up

Xcode Canvas for SwiftUI previews does not show up

You need to be on Catalina macOS version (10.15), as stated in official tutorial

Be warned: Catalina doesn't support 32-bit applications, some old apps will stop working after update.

Xcode 13 will not show Preview

I had the same problem and found a solution here:
https://developer.apple.com/forums/thread/691237

I was not signed in to GitHub so as suspected, it does not play a role.

It seems Xcode got in to an invalid state. I suspect that simply disabling and enabling automatic signing would resolve the issue but I also cleared the Container folder for my project as suggested in the post.

Xcode 11 beta swift ui preview not showing

To preview and interact with views from the canvas in Xcode, ensure your Mac is running on Catalina MacOS.

https://developer.apple.com/tutorials/swiftui/creating-and-combining-views

Please check apple document in the following URL
https://developer.apple.com/documentation/xcode_release_notes/xcode_11_beta_2_release_notes

Xcode 11 beta supports development with SwiftUI.

Note

Tools for SwiftUI development are only available when running on macOS
Catalina 10.15 beta.

XCode 13 SwiftUI Cannot preview in this file - Message send failure for update

I managed to fix this by wrapping the ContentView() call in the preview in a ZStack. This is a known bug caused by @FocusState when used in a top-level view that the preview window is rendering.

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ZStack {
            ContentView()
        }
    }
}

Credit: https://developers.apple.com/forums/thread/681571?answerId=690251022#690251022

Xcode 13.2 SwiftUI Preview Crashes

Solved by adding ZStack in Preview struct solved it.. This is maybe a bug.
Solution

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
       ZStack {
           ContentView()
       }
    }
}

Display View In Blank Canvas

Change to the selectable preview mode at the bottom of the canvas:

Then add this to the preview code:

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
            ContentView()
            .previewLayout(.sizeThatFits) // here
    }
}

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