Question

我将Storyboard与MvvmCross和Xamarin iOS一起使用。我要例外了。这是堆栈跟踪：

{System.Collections.Generic.KeyNotFoundException：找不到Kosht.Core.ViewModels.TutorialViewModel的视图在MvvmCross.Views.MvxViewsContainer.GetViewType（System.Type viewModelType）[0x00081]中，位于：0 在MvvmCross.Presenters.MvxAttributeViewPresenter.GetPresentationAttribute（MvvmCross.ViewModels.MvxViewModelRequest请求）中的[0x0000c]在：0中在MvvmCross.Presenters.MvxAttributeViewPresenter.Show处（MvvmCross.ViewModels.MvxViewModelRequest请求）[0x00000]在：0中在MvvmCross.Platforms.Ios.Views.MvxIosViewDispatcher + <> c__DisplayClass2_0.b__0（）[0x0001d]在：0中在MvvmCross.Base.MvxMainThreadAsyncDispatcher + <> c__DisplayClass0_0.b__0（）[0x00000]在：0中在MvvmCross.Base.MvxMainThreadAsyncDispatcher + <> c__DisplayClass1_0 + d.MoveNext（）[0x00011]在：0中 ---从之前引发异常的位置开始的堆栈结束跟踪--- 在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.14.0.14/src/Xamarin.iOS/mcs/class/中的System.Runtime.CompilerServices.AsyncMethodBuilderCore + <> c.b__6_0（系统对象状态）[0x00000] referencesource / mscorlib / system / runtime / compilerservices / AsyncMethodBuilder.cs：1018 在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.14.0.14/src/Xamarin.iOS/Foundation/NSAction.cs:178中的Foundation.NSAsyncSynchronizationContextDispatcher.Apply（）[0x00000]中 ---从之前引发异常的位置开始的堆栈结束跟踪--- 在（包装器托管到本地）UIKit.UIApplication.UIApplicationMain（int，string []，intptr，intptr）在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.14.0.14/src/Xamarin.iOS中的UIKit.UIApplication.Main（System.String [] args，System.IntPtr主体，System.IntPtr委托）[0x00005] /UIKit/UIApplication.cs:79 在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.14.0.14/src/Xamarin.iOS中的UIKit.UIApplication.Main（System.String [] args，System.StringPrincipalClassName，System.String委托ClassName）[0x0002c] /UIKit/UIApplication.cs:63 在/Users/vadimkhadyka/Projects/Kosht/src/Mobile/Kosht.iOS/Main.cs:13}中的Kosht.iOS.Application.Main（System.String [] args）[0x00001]

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继承了MvxViewController，一切都会很好，但是对于我的基类，我会遇到异常。

Answer 1

更改此行

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

收件人

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

并删除此

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

MvvmCross Xamarin IOS“找不到ViewModel的视图”

1 个答案: