如何使用 Xamarin Forms mac 应用程序进行关闭确认？

Question

我有 Xamarin.Forms 申请 iOS, Android,，现在希望 Mac。我对 UI 进行了所有调整，以便在 Mac 上看起来很棒。在被拒绝的地方提交以供批准，因为用户可以关闭 window 而应用程序和菜单栏仍然是运行。所以我想我会添加一个确认弹出窗口，询问他们在尝试关闭 window.

时是否要退出应用程序

确定 = 终止应用程序。
取消 = 保持 window 打开。

我找到很多关于如何使用 Xamarin.Mac 应用程序处理此问题的文章，但没有关于如何在 Mac 上处理 Xamarin.Forms 的文章。 FormsApplicationDelegate 不允许访问视图控制器或 Window 委托以覆盖 WindowShouldClose 方法。我发现我可以使用 NSAlert 来制作效果很好的弹出窗口。现在我找不到关于用户响应时该怎么做的任何信息。接受建议。

 private void Window_WillClose(object sender, System.EventArgs e)
    {
        NSNotification senderNotification = ((NSNotification)sender); 
        NSWindow closingWindow = (NSWindow)senderNotification.Object;

        var confirmation = new NSAlert()
        {
            AlertStyle = NSAlertStyle.Warning,
            InformativeText = "Are you sure you want to exit the App?",
            MessageText = "Exit?"
        };
        confirmation.AddButton("OK");
        confirmation.AddButton("Cancel");
        var result = confirmation.RunModal();

        if (result == 1001)
        {
            //Cancel closing the window
        }
        else
        {
            //terminate the app
        }

    }

Answer 1

经过大量试验，我确实找到了解决办法。这是正式通过Apple审查的内容。它要求 n 个菜单操作链接为 "New Window"。它会跟踪打开的 windows，当只剩下一个时，它会提示关闭该应用程序。如果用户关闭所有 windows 并保留应用程序运行，他们可以选择在菜单中打开一个新的 window。

 [Register("AppDelegate")]
    public class AppDelegate : FormsApplicationDelegate
    {
        public NSWindow window;
        private bool closeApp;
        private List<NSWindow> openWindows;
        public override NSWindow MainWindow
        {
            get { return window; }
        }


        public AppDelegate()
        {
            this.closeApp = false;
            this.openWindows = new List<NSWindow>();
            createNewWindow();
        }

        [Action("newWindow:")]
        public void newWindow(NSObject sender)
        {

            createNewWindow();
            this.window.MakeKeyAndOrderFront(sender);
            LoadApplication(new App());
            base.DidFinishLaunching(null);

        }

        private void createNewWindow()
        {
            var style = NSWindowStyle.Closable | NSWindowStyle.Resizable | NSWindowStyle.Titled;
            var rect = new CoreGraphics.CGRect(200, 1000, 1024, 768);
            window = new MainWindow(rect, style, NSBackingStore.Buffered, false);
            window.Title = "MyApp"; // choose your own Title here
            window.TitleVisibility = NSWindowTitleVisibility.Hidden;
            window.WillClose += Window_WillClose;
            openWindows.Add(window);
        }

        private void Window_WillClose(object sender, System.EventArgs e)
        {
            openWindows.Remove((NSWindow)((NSNotification)sender).Object);
            if (openWindows.Count == 0)
            {
                var confirmation = new NSAlert()
                {
                    AlertStyle = NSAlertStyle.Warning,
                    InformativeText = "Do you want to exit the app?",
                    MessageText = "Exit?"
                };
                confirmation.AddButton("Yes");
                confirmation.AddButton("No");
                var result = confirmation.RunModal();

                if (result == 1001)
                {
                    this.closeApp = false;
                }
                else
                {
                    //terminate the app
                    this.closeApp = true;
                }
            }
        }

        public override bool ApplicationShouldTerminateAfterLastWindowClosed(NSApplication sender)
        {
            return closeApp;
        }

        public override void DidFinishLaunching(NSNotification notification)
        {
            Forms.Init();
            LoadApplication(new App());
            base.DidFinishLaunching(notification);
        }
    }

如何使用 Xamarin Forms mac 应用程序进行关闭确认？

How to do a Close Confirmation with a Xamarin Forms mac App?

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