ios - MonoTouch.Dialog 无法绑定(bind)源属性

Question

我不断收到以下错误消息:

MvxBind:Warning: 15.51 Unable to bind: source property source not found 
Cirrious.MvvmCross.Binding.Parse.PropertyPath.PropertyTokens.MvxPropertyNamePropertyToken on null-object

找不到此问题的解决方案 - 3 小时后。

这就是 View 模型:

public class SettingsViewModel : MvxViewModel
{
    public SettingsViewModel()
    {

    }

    private bool testdata;
    public bool Testdata
    {
        get { return testdata; }
        set 
        {
            testdata = value; 
            RaisePropertyChanged(() => Testdata);
            //Debug.WriteLine("IN");
        }
    }
}

View :

[Register("SettingsView")]
public class SettingsView : MvxDialogViewController
{
    public SettingsView()
        : base(pushing: true)
    {

    }

    public override void ViewDidLoad()
    {
        var bindings = this.CreateInlineBindingTarget<SettingsViewModel>();
        Root = new RootElement("Settings"){
             new Section("General")
             {
                 new BooleanElement("Testdata ON/OFF", true).Bind(bindings, t => t.Testdata)
             }
         };
    }
}

尝试将 de booleanelement 绑定(bind)到 Testdata 属性时发生错误。

感谢任何帮助!

Answer 1

这里警告的关键部分似乎是on null-object

默认情况下，MvvmCross View 在 ViewDidLoad() 期间找到它们的 ViewModel - 因此解决您当前问题的方法可能是调用base.ViewDidLoad():

public override void ViewDidLoad()
{
    base.ViewDidLoad();

    // the rest of your Load code
}