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macosswiftuiswiftui-windowgroup

How to limit the number of windows in a WindowGroup?

I am building a single window application and want to use the new SwiftUI App Lifecycle.

import SwiftUI

@main
struct SingleWindowApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

The default implementation of WindowGroup allows multiple instances of the window (i.e. if you hit ⌘N). I wasn’t able to find a modifier that changes that behaviour.

How would I limit the number of windows within a WindowGroup to just 1?

Solution

  • This should do it:

    import SwiftUI

@main
struct SingleWindowApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
        .commands {
            CommandGroup(replacing: .newItem, addition: { })
        }
    }
}