MvvmCross Xamarin IOS“无法找到ViewModel的视图”

Question

我使用Storyboard与MvvmCross和Xamarin iOS。我得到了例外。这是堆栈跟踪：

{System.Collections.Generic.KeyNotFoundException：无法在MvvmCross.View.MvxViewsContainer.GetViewType（System.Type viewModelType）[0x00081]中找到Kosht​​.Core.ViewModels.TutorialViewModel的视图：0，MvvmCross.Presenters.MvxAttributeViewPresenter.GetPresentationAttribute（ MvvmCross.ViewModels.MvxViewModelRequest request）[0x0000c] in：0 at MvvmCross.Presenters.MvxAttributeViewPresenter.Show（MvvmCross.ViewModels.MvxViewModelRequest request）[0x00000] in：0 at MvvmCross.Platforms.Ios.Views.MvxIosViewDispatcher + <> c__DisplayClass2_0.b__0 （）[0x0001d] in：0，MvvmCross.Base.MvxMainThreadAsyncDispatcher + <> c__DisplayClass0_0.b__0（）[0x00000] in：0 at MvvmCross.Base.MvxMainThreadAsyncDispatcher + <> c__DisplayClass1_0 + <b__0> d.MoveNext（）[0x00011] in：0 ---抛出异常的前一个位置的堆栈跟踪结束---在/Library/Frameworks/Xamarin.iOS.framework中的System.Runtime.CompilerServices.AsyncMethodBuilderCore + <> c.b__6_0（System.Object state）[0x00000] /版本/ 11 /Library/Frameworks/Xamarin.iOS中的.14.0.14 / src / Xamarin.iOS / mcs / class / referencesource / mscorlib / system / runtime / compilerservices / AsyncMethodBuilder.cs：1018 at Foundation.NSAsyncSynchronizationContextDispatcher.Apply（）[0x00000] .framework / Versions / 11.14.0.14 / src / Xamarin.iOS / Foundation / NSAction.cs：178 ---从抛出异常的先前位置开始的堆栈跟踪结束---在（包装器托管到本机）UIKit。 UIApplication.UIApplicationMain（int，string []，intptr，intptr）在/ Library/Frameworks/Xamarin.iOS中的UIKit.UIApplication.Main（System.String [] args，System.IntPtr principal，System.IntPtr委托）[0x00005] .framework / Versions / 11.14.0.14 / src / Xamarin.iOS / UIKit / UIApplication.cs：79在UIKit.UIApplication.Main（System.String [] args，System.String principalClassName，System.String delegateClassName）[0x0002c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.14.0.14/src/Xamarin.iOS/UIKit/UIApplication.cs:63 at Kosht​​.iOS.Application.Main（System.String [] args）[0x00001] in /用户/ v adimkhadyka / Projects / Kosht​​ / src / Mobile / Kosht​​.iOS / Main.cs：13}

我的TutorialView：

[MvxViewFor(typeof(TutorialViewModel))]
    [MvxFromStoryboard("Tutorial")]
    [MvxRootPresentation]
    public partial class TutorialView : BaseViewController<TutorialViewModel>
    {
        public TutorialView() : base("TutorialView", null)
        {
        }

        public override void ViewDidLoad()
        {
            base.NavigationController.NavigationBarHidden = true;
            base.ViewDidLoad();
        }
    }

我的BaseViewController：

    public class BaseViewController<TViewModel> : MvxViewController,  IBaseView<TViewModel> where TViewModel : BaseViewModel
        {
            protected BaseViewController(string nibName, NSBundle bundle) : base(nibName, bundle)
            {
            }

            public BaseViewController(IntPtr handle) : base(handle)
            {
            }

            public BaseViewController()
            {
            }

            public override void ViewDidLoad()
            {
                base.ViewDidLoad();
                // Perform any additional setup after loading the view, typically from a nib.
            }

            public new TViewModel ViewModel => (TViewModel)base.ViewModel;


            public override void DidReceiveMemoryWarning()
            {
                base.DidReceiveMemoryWarning();
                // Release any cached data, images, etc that aren't in use.
            }
}

如果我删除BaseViewController并从TutorialView继承我的MvxViewController，一切都很好，但是我的基类我得到了例外。

Answer 1

改变这一行

public class BaseViewController<TViewModel> : MvxViewController,  IBaseView<TViewModel> where TViewModel : BaseViewModel

至

public class BaseViewController<TViewModel> : MvxViewController<TViewModel> where TViewModel : class, IMvxViewModel

并删除此

public new TViewModel ViewModel => (TViewModel)base.ViewModel;