Xamarin.ios 在MonoTouch.Dialog中，我需要做什么才能使日期时间选择器具有；“好的”；及；取消“；选项

在MonoTouch.Dialog中，我需要做什么才能使日期时间选择器具有“确定”和“取消”选项

在此示例代码中，当您单击DateTime元素并导航到选取器屏幕时，在导航到日期选取器后，无法选择或取消

[Register ("AppDelegate")]
public partial class AppDelegate : UIApplicationDelegate
{
    protected UIWindow window;
    protected UINavigationController navigationController;
    protected RootElement rootElement;
    protected DialogViewController dialogViewController;        

    public override bool FinishedLaunching (UIApplication app, NSDictionary options)
    {
        window = new UIWindow (UIScreen.MainScreen.Bounds);
        var navigationController = new UINavigationController();
        window.AddSubview (navigationController.View);
        window.MakeKeyAndVisible ();

        rootElement = CreateJsonItems();
        dialogViewController = new DialogViewController (rootElement, true);
        navigationController.PushViewController (dialogViewController, true);

        return true;
    }

    protected RootElement CreateJsonItems()
    {
        var json = 
            @"{
                ""title"": ""Json Sample"",
                ""sections"": [{
                    ""header"": ""Dates and Times"",
                    ""elements"": [{
                        ""type"": ""datetime"",
                        ""caption"": ""Date and Time"",
                        ""value"": ""Sat, 01 Nov 2008 19:35:00 GMT""
                    }, {
                        ""type"": ""date"",
                        ""caption"": ""Date"",
                        ""value"": ""10/10""
                    }, {
                        ""type"": ""time"",
                        ""caption"": ""Time"",
                        ""value"": ""11:23""
                    }]
                }]
            }";

        using(var reader = new StringReader(json))
        {
            var jsonObject = JsonObject.Load(reader) as JsonObject;
            var jsonElement = JsonElement.FromJson(jsonObject);
            return jsonElement;
        }
    }
}

谢谢大家!！在应用您的建议后，这是修复它的代码

public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
    window = new UIWindow (UIScreen.MainScreen.Bounds);
    rootElement = CreateJsonItems();
    var dialogViewController = new DialogViewController(rootElement);
    navigationController = new UINavigationController(dialogViewController);
    window.Add (navigationController.View);
    window.MakeKeyAndVisible ();
    return true;
}

---

在MonoTouch.Dialog中这样使用时，选择器不是模态的。因此，是导航UI让您返回到上一个视图。这样做将隐藏的OTOH：

   var navigationController = new UINavigationController();
   window.AddSubview (navigationController.View);

注意：这也是一个（）问题，因为它不会保留对

navigationController

的引用

您应该尝试用以下内容替换上述内容（并在创建

对话框ViewController

后将其移动）：

---

这将返回默认的导航UI，并允许您从日期选择器返回。

谢谢！我在上面添加了修复。

[Register ("AppDelegate")]
public partial class AppDelegate : UIApplicationDelegate
{
    protected UIWindow window;
    protected UINavigationController navigationController;
    protected RootElement rootElement;
    protected DialogViewController dialogViewController;        

    public override bool FinishedLaunching (UIApplication app, NSDictionary options)
    {
        window = new UIWindow (UIScreen.MainScreen.Bounds);
        var navigationController = new UINavigationController();
        window.AddSubview (navigationController.View);
        window.MakeKeyAndVisible ();

        rootElement = CreateJsonItems();
        dialogViewController = new DialogViewController (rootElement, true);
        navigationController.PushViewController (dialogViewController, true);

        return true;
    }

    protected RootElement CreateJsonItems()
    {
        var json = 
            @"{
                ""title"": ""Json Sample"",
                ""sections"": [{
                    ""header"": ""Dates and Times"",
                    ""elements"": [{
                        ""type"": ""datetime"",
                        ""caption"": ""Date and Time"",
                        ""value"": ""Sat, 01 Nov 2008 19:35:00 GMT""
                    }, {
                        ""type"": ""date"",
                        ""caption"": ""Date"",
                        ""value"": ""10/10""
                    }, {
                        ""type"": ""time"",
                        ""caption"": ""Time"",
                        ""value"": ""11:23""
                    }]
                }]
            }";

        using(var reader = new StringReader(json))
        {
            var jsonObject = JsonObject.Load(reader) as JsonObject;
            var jsonElement = JsonElement.FromJson(jsonObject);
            return jsonElement;
        }
    }
}