How can I support macOS 10.15 while using SwiftUI's new App type

Question

Created Jun ’20

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I'm in the process of adopting some of the new SwiftUI features released in macOS 11, namely using the App type. The result of this is that I need to switch between the new type that's conforming to App and the older AppDelegate in my code based off of the os version running.

To do this, I need to introduce a new main function but am unsure of the syntax required. Does anyone have some pointers as to how I could do such an implementation?

Much thanks.

Answered by mattdelves in 615169022

Sorry, my question may not have been entirely clear. I've got an @availability check around the new stuff. What I needed to do was create a main.swift file that does the switching between the new type which conforms to App and the older AppDelegate implementation. This ended up looking like the following.

Code Block if #available(macOS 10.16, *) {
  MyAwesomeNewImplementaitonOfApp.main()
} else {
  let app = NSApplication.shared
  let delegate = AppDelegate()
  app.delegate = delegate
  app.run()
}

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Answer 1

Developer Tools Engineer OP

Apple

Jun ’20

The new functionality in SwiftUI is part of the SwiftUI framework that’s delivered with macOS 11, thus it’s not something you can back-deploy to an earlier macOS.

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Answer 2

mattdelves OP

Jun ’20

Accepted Answer

Sorry, my question may not have been entirely clear. I've got an @availability check around the new stuff. What I needed to do was create a main.swift file that does the switching between the new type which conforms to App and the older AppDelegate implementation. This ended up looking like the following.

Code Block if #available(macOS 10.16, *) {
  MyAwesomeNewImplementaitonOfApp.main()
} else {
  let app = NSApplication.shared
  let delegate = AppDelegate()
  app.delegate = delegate
  app.run()
}

0