ios - 在 MacCatalyst 的 SwiftUI 应用程序中隐藏标题栏

Question

如何在新的 SwiftUI 应用协议(protocol)中隐藏标题栏？
由于 AppDelegate.swift 和 SceneDelegate.swift 协议(protocol)消失了，我不能再遵循这个文档了:
https://developer.apple.com/documentation/uikit/mac_catalyst/removing_the_title_bar_in_your_mac_app_built_with_mac_catalyst
我无法实现此代码:

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?    
    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = (scene as? UIWindowScene) else { return }
        #if targetEnvironment(macCatalyst)
        if let titlebar = windowScene.titlebar {
            titlebar.titleVisibility = .hidden
            titlebar.toolbar = nil
        }
        #endif
    }
}

希望新的 AppProtocol 仍有可能。
提前致谢

Answer 1

这是隐藏标题栏的方法:

struct ContentView: View {
    var body: some View {
        ZStack {
            Text("Example UI")
        }
        .withHostingWindow { window in
            #if targetEnvironment(macCatalyst)
            if let titlebar = window?.windowScene?.titlebar {
                titlebar.titleVisibility = .hidden
                titlebar.toolbar = nil
            }
            #endif
        }
    }
}

extension View {
    fileprivate func withHostingWindow(_ callback: @escaping (UIWindow?) -> Void) -> some View {
        self.background(HostingWindowFinder(callback: callback))
    }
}

fileprivate struct HostingWindowFinder: UIViewRepresentable {
    var callback: (UIWindow?) -> ()

    func makeUIView(context: Context) -> UIView {
        let view = UIView()
        DispatchQueue.main.async { [weak view] in
            self.callback(view?.window)
        }
        return view
    }

    func updateUIView(_ uiView: UIView, context: Context) {
    }
}