How can I open a new window in a SwiftUI app on macos?

To open a new window in a SwiftUI app on macOS, you can use the openWindow environment action. Here’s a step-by-step guide based on the information from the WWDC sessions:

1. Define a Window Group: First, define a new window group in your app. This window group will contain the content you want to display in the new window.

   struct MovieWindow: Scene {
       var body: some Scene {
           WindowGroup("Movie") {
               MovieView()
           }
           .windowStyle(.plain)
       }
   }
   

2. Retrieve the openWindow Action: In the view where you want to trigger the opening of the new window, retrieve the openWindow action from the environment.

   struct ContentView: View {
       @Environment(\.openWindow) private var openWindow
   
       var body: some View {
           Button("Open Movie Window") {
               openWindow(id: "movie")
           }
       }
   }
   

3. Use the openWindow Action: Use the openWindow action within a button or any other interactive element to open the new window.

   Button("Open Movie Window") {
       openWindow(id: "movie")
   }
   

Here’s a more detailed example from the session Work with windows in SwiftUI:

struct ContentView: View {
    @Environment(\.openWindow) private var openWindow

    var body: some View {
        Button("Open Movie Window") {
            openWindow(id: "movie")
        }
    }
}

In this example, the openWindow action is used to open a new window with the ID "movie". This ID corresponds to the window group defined earlier.

For more details, you can watch the session Work with windows in SwiftUI.