更新Monotouch.Dialog RootElement

Question

我一直在遵循monotouch.dialog任務示例應用程序（http://docs.xamarin.com/ios/Guides/User_Interface/MonoTouch.Dialog/Elements_API_Walkthrough）中的代碼。

我似乎無法解決的問題是，當用戶單擊+按鈕時，將在表中添加新行。 用戶觸摸此按鈕，然后導航到另一個可以輸入信息的屏幕。 現在，當它們導航回到根視圖時，我希望更新rootElements的列表，以便使用輸入的名稱代替默認名稱“ connection”

我將如何根據輸入的內容為每個RootElement更新文本？

我希望一切都有道理！

-下面的代碼。

public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
    window = new UIWindow (UIScreen.MainScreen.Bounds);

    RootElement _rootElement = new RootElement ("To Do List"){ new Section()};

    DialogViewController _rootVC = new DialogViewController (_rootElement);

    // This adds an 'add' button to the root view controller, and handles by delegate,the push to a screen where you can add a new vCenter connection profile.
    UIBarButtonItem _addButton = new UIBarButtonItem (UIBarButtonSystemItem.Add);
    _rootVC.NavigationItem.RightBarButtonItem = _addButton;

    _addButton.Clicked += (sender, e) =>  {
        var connectionProfile = new connectionProfile{};
        // See, on the line below, I add a default RootElement with the text New Connection.

        var connectionProfileElements = new RootElement ("New Connection") {
            new Section () {
                // When they enter the name on the next line of code, I want to use this to update the New Connection text on the root screen.
                new EntryElement ("Name", "Enter Connection Name", connectionProfile._connectionName),
                new EntryElement ("VC Address", "Enter VC Address", connectionProfile._address),
                new EntryElement ("VC Port", "Enter VC Port", connectionProfile._port),
                new EntryElement ("Username", "Enter Username", connectionProfile._userID),
                new EntryElement ("Password", "Enter Password", connectionProfile._password,true)}      
            };
            _rootElement [0].Add (connectionProfileElements);
        };

        UINavigationController _nav = new UINavigationController (_rootVC);
        window.RootViewController = _nav;
        window.MakeKeyAndVisible ();

        return true;
    }
}

和：

public class connectionProfile
{
public connectionProfile ()
    {
    }

    public string _connectionName { get; set; }
    public string _address { get; set; }
    public string _port { get; set; }
    public string _userID {get; set; }
    public string _password { get; set; }
}

Answer 1

您是否嘗試this.ReloadData(); 像這樣 ？

public NameOfYourDialogViewController() : base (UITableViewStyle.Grouped, null)
{
    Root = new RootElement ("test") {
        new Section ("First Section"){
            new StringElement ("Hello", () => {
                new UIAlertView ("Hola", "Thanks for tapping!", null, "Continue").Show (); 
            }),
            new EntryElement ("Name", "Enter your name", String.Empty)
        },
        new Section ("Second Section"){
        },
    };
    }
}
public override void ViewDidLoad ()
{
    base.ViewDidLoad ();
    // Do your stuff
}

public override void ViewWillAppear (bool animated)
{
    base.ViewWillAppear (animated);
    this.ReloadData();
}

您可以在此處找到有關此主題的其他主題。

編輯

您忘了說這位於您的AppDelegate中，它不是針對您正在做的事情。

首先，創建一個DialogViewController： 項目>添加新文件> MonoTouch> DialogViewController 。 在前面提到的另一種方法中，放入ReloadData（）方法。 這些方法（ViewDidLoad，WillAppear等）是UIView中的替代方法。 AppDelegate的存在是為了在您啟動之前獲取數據，為您的應用存儲靜態數據，等等。 完全不同的用法。

對於您的AppDelegate，您應該有以下示例：

public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
    _window = new UIWindow (UIScreen.MainScreen.Bounds);
    _controller = new NameOfYourDialogViewController();

    _navigationController = new UINavigationController (_controller);

    UIImageView splash = new UIImageView(_window.Bounds);
    splash.Image = UIImage.FromFile("Default.png");

    _window.AddSubview(splash);
    _window.AddSubview(_navigationController.View);
    _window.BringSubviewToFront(splash);

    _window.MakeKeyAndVisible ();

    // This is used to create a fadding effect in your splashscreen
    UIView.Animate(1,
            delegate { splash.Alpha = 0f; },
            delegate {
                _window.RootViewController = _navigationController;
                splash.RemoveFromSuperview();
            });
    return true;
}