Using Xcode 12 build errors for target macOS 10.15

Question

As of Xcode 12.3, when you create a new SwiftUI project with a target of macOS, Xcode defaults the target to 11.0 (Big Sur). Without changing a line of code in the default "hello world" app created by default, I then change the target to macOS 10.15 (which is what I am still using) The default project swift file will no longer build.:-

 @main struct catalinaApp: App { var body: some Scene { WindowGroup { ContentView() } } }``` 3 Errors: @main, 'Scene' and WindowGroup is only available in macOS 11.0 or newer How can I alter the project/above file to correctly build the default app on Catalina? (10.15) ? thanks in advance!

Check this : developer.apple.com/documentation/swiftui/windowgroup. WindowGroup is required minimum Mac OS 11 so set you’re project target minimum 11 — Raja Kishan
– Raja Kishan, Commented Dec 18, 2020 at 19:30
Thanks - the documentation above confirms that WindowGroup requires macOS 11. The question is, what is the equivalent for macOS 10.15? What code was used for macOS apps before macOS 11 came out? — Disco
– Disco, Commented Dec 18, 2020 at 19:40
Use old lifecycle - AppDelegate. Option available when you create new project. — Raja Kishan
– Raja Kishan, Commented Dec 18, 2020 at 19:42
Perfect - thank you! I wasn't aware of the lifecycle option. Using the AppDelegate option also sets macOS 10.15 as the default target, and it compiles perfectly. (Interesting to note that the App Delegate version of Hello World uses a .frame(), whereas the new SwiftUI lifecycle uses .padding(). ) — Disco
– Disco, Commented Dec 18, 2020 at 19:56

Disco · Accepted Answer · 2020-12-18 19:57:41Z

13

Thanks to @Raja Kishan, the answer is simply to choose the App Delegate option in the choices for Lifecycle when creating a new project.

answered Dec 18, 2020 at 19:57

Disco

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2 Comments

Michel Storms Over a year ago

Can you mark this as solution? Might save others some time. Thanks!

Bob Broadley Over a year ago

Wow - two days searching the internet and a full reinstall and this was ALL I needed - thanks...! Wish I could give this +10.

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