如何为基于AppKit的macOS SwiftUI应用设置主窗口标题？

Hey there! Let's fix that missing window title issue for your macOS app. Since you're using a mix of AppKit and SwiftUI and couldn't find a "title segment" in Main.storyboard, here are a few practical approaches to add a title to your window:

Method 1: Use SwiftUI Environment to Access NSWindow #

This works great if you're using the modern SwiftUI App lifecycle (macOS 11+):

1. First, add an environment key to pass the NSWindow reference to your views:

private extension EnvironmentValues {
    var window: NSWindow? {
        get { self[WindowKey.self] }
        set { self[WindowKey.self] = newValue }
    }
}

private struct WindowKey: EnvironmentKey {
    static let defaultValue: NSWindow? = nil
}

2. Inject the window reference in your app's entry point:

@main
struct WebViewApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(\.window, NSApplication.shared.windows.first)
        }
    }
}

3. Set the title in your main view when it appears:

struct ContentView: View {
    @Environment(\.window) private var window
    
    var body: some View {
        WKWebView(url: URL(string: "https://your-target-url.com")!)
            .onAppear {
                window?.title = "My Web Browser" // Replace with your desired title
                // Optional: Ensure title is visible if using transparent title bar
                window?.titleVisibility = .visible
            }
    }
}

Method 2: Set Title via AppKit's NSViewController #

If you're using a storyboard with an NSViewController hosting your SwiftUI view, you can set the title directly in the view controller:

class MainViewController: NSViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Set window title here
        self.view.window?.title = "My Web View App"
        
        // If you're embedding SwiftUI content:
        self.view = NSHostingView(rootView: ContentView())
    }
}

Method 3: Create NSWindow Manually (No Storyboard) #

If you're ditching the storyboard entirely and creating the window programmatically, set the title when initializing the window:

@main
struct WebViewApp: App {
    @NSApplicationDelegateAdaptor(AppDelegate.self) var delegate
}

class AppDelegate: NSObject, NSApplicationDelegate {
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Create a window with standard titled style
        let window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 800, height: 600),
            styleMask: [.titled, .closable, .miniaturizable, .resizable],
            backing: .buffered, defer: false)
        
        window.title = "Custom Web View App" // Your title here
        window.center()
        window.contentView = NSHostingView(rootView: ContentView())
        window.makeKeyAndOrderFront(nil)
    }
}

Quick Check: Ensure Window Style Includes Titled #

If your window still doesn't show a title, double-check that the window's style mask includes .titled. Without this flag, the title bar (and title) won't appear at all.

内容的提问来源于stack exchange，提问作者esaruoho