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SwiftUI: Change “About View” in macOS app


I am building a macOS-app using SwiftUI and the new App lifecycle.

I would love to change the contents of the “About Window” (that appears when you tap “About DemoApp” in the apps’ menu) but have no idea how:

enter image description here

How can I replace the About view with a custom one?


Solution

  • You can do it but it does require creating an AppDelegate. Here's what your AppFile should look like:

    struct MyApp: App {
        @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    
        var body: some Scene {
            WindowGroup {
                MainView()
            }
            .commands {
                CommandGroup(replacing: CommandGroupPlacement.appInfo) {
                    Button(action: {
                        appDelegate.showAboutPanel()
                    }) {
                        Text("About My App")
                    }
                }
            }
        }
    }
    

    and your AppDelegate Should Look like this:

    class AppDelegate: NSObject, NSApplicationDelegate {
        private var aboutBoxWindowController: NSWindowController?
    
        func showAboutPanel() {
            if aboutBoxWindowController == nil {
                let styleMask: NSWindow.StyleMask = [.closable, .miniaturizable,/* .resizable,*/ .titled]
                let window = NSWindow()
                window.styleMask = styleMask
                window.title = "About My App"
                window.contentView = NSHostingView(rootView: AboutView())
                aboutBoxWindowController = NSWindowController(window: window)
            }
    
            aboutBoxWindowController?.showWindow(aboutBoxWindowController?.window)
        }
    }
    

    Then, just make a SwiftUI View named AboutView and it'll display that in your About Box. For Example:

    struct AboutView: View {
        var body: some View {
            VStack {
                Spacer()
                HStack {
                    Spacer()
                    Text("Hello, World!")
                    Spacer()
                }
                Spacer()
            }
            .frame(minWidth: 300, minHeight: 300)
        }
    }