turning project made for Big Sur into project made for Catalina 10.15

Question

Created Dec ’20

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I want to work on an app to serve as essentially a place for my customers to "keep an eye" on what my business is "up to" and have run into a roadblock. I don't know the 10.15 alternatives to @main, Scene and WindowGroup and I cannot update to Big Sur yet because I am not an administrator on this Mac and just want to only preview my project. I hope people are kinder than on StackOverflow.

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Answer 1

OOPer OP

Dec ’20

Accepted Answer

The runtime needed for @main, Scene or WindowGroup exists only in Bug Sur.

So, you have very limited options.

Rewrite your app without @main, Scene or WindowGroup, you may need Xcode 11.x which comes with macOS SDK 10.15.
Get another Mac which runs Big Sur.

1

Answer 2

Claude31 OP

Dec ’20

On Xcode 12.2, Catalina 10.15.7, iOS 14.2 simulator:
I have an app with @Main and scene (do not use Windowsgroup).
It works.

AppDelegate class:

Code Block import UIKit
@main
class AppDelegate: UIResponder, UIApplicationDelegate {

SceneDelegate class:

Code Block import UIKit
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?

So, is your problem specific to windowsGroup ?

0