我正在尝试使用 Storyboard编写一个 MvvmCross 应用程序。我知道有类似的问题，但我已经遵循了解决方案，但我无法让它工作。我已经引用了我在这个问题中尝试过的解决方案之一。

我将从一开始就解释我所做的事情，希望这有助于诊断我的问题

1. 在 Visual Studio 中使用通用 iOS 单 View 应用程序创建一个项目。
2. 我进行标准的 MvvmCross 设置、添加 nuget、更新 AppDelegate 等。
3. 我让它编译。<​​ i="">
4. 我向 iPhone Storyboard添加了一个新的 ViewController。我称之为 LogonViewController。我将类、 Storyboard ID 和恢复 ID 设置为 LogonViewController。生成 LogonViewController 类。我将其更改为从 MvxViewController 派生
5. 我将入口箭头从 RootViewController( Storyboard上最初创建时的 View Controller )移到指向 LogonViewController。我将 RootViewController 留在 Storyboard上

6. 我将 LogonViewController 类更改为从 MvxViewController 派生并将 Register 属性设置为 LogonView eg

   [Register ("LogonView")]
   partial class LogonViewController
   

7. 我向 LogonViewController 添加了一个标签作为显示内容。

8. 我根据

   中的帖子创建了一个派生自 MvxTouchViewsContainers 的自定义容器

MVVMCross support for Xamarin.iOS Storyboards

问题是，当在自定义容器中调用重写方法(如下所示)时，我得到一个无效的强制转换异常，因为它无法将 UIKit.UIViewController 强制转换为 IMvxTouchView

我也得到一个算术溢出异常

protected override IMvxTouchView CreateViewOfType(Type viewType, MvxViewModelRequest request)
{
    return (IMvxTouchView)UIStoryboard.FromName("MyStoryBoard", null)


    .InstantiateViewController(viewType.Name);
}

在跟踪日志中我得到以下错误

2015-01-28 18:12:09.833 MyApp[3743:68927] mvx:Diagnostic:  8.61 Setup: LastChance start
[0:] mvx:Diagnostic:  8.61 Setup: LastChance start
[0:] 
2015-01-28 18:12:10.247 MyApp[3743:68927] mvx:Diagnostic:  9.05 Setup: Secondary end
[0:] mvx:Diagnostic:  9.05 Setup: Secondary end
[0:] 
2015-01-28 18:12:10.647 MyApp[3743:68927] mvx:Diagnostic:  9.43 Showing ViewModel LogonViewModel
[0:] mvx:Diagnostic:  9.43 Showing ViewModel LogonViewModel
[0:] 
2015-01-28 18:12:11.049 MyApp[3743:68927] TouchNavigation:Diagnostic:  9.83 Navigate requested
[0:] TouchNavigation:Diagnostic:  9.83 Navigate requested
2015-01-28 18:12:11.254 MyApp[3743:68927] Unknown class LogonViewController in Interface Builder file.
2015-01-28 18:12:23.962 MyApp[3743:68927] -[UIViewController bottomLayoutGuide]: guide not available before the view controller's view is loaded
System.OverflowException: Arithmetic operation resulted in an overflow.
   at Mono.Debugging.Soft.SoftDebuggerAdaptor.TargetObjectToObject(EvaluationContext ctx, Object obj)
   at Mono.Debugging.Evaluation.ExpressionEvaluator.TargetObjectToExpression(EvaluationContext ctx, Object obj)
   at Mono.Debugging.Evaluation.ObjectValueAdaptor.CreateObjectValueImpl(EvaluationContext ctx, IObjectValueSource source, ObjectPath path, Object obj, ObjectValueFlags flags)
   at Mono.Debugging.Evaluation.ObjectValueAdaptor.CreateObjectValue(EvaluationContext ctx, IObjectValueSource source, ObjectPath path, Object obj, ObjectValueFlags flags)
System.OverflowException: Arithmetic operation resulted in an overflow.
   at Mono.Debugging.Soft.SoftDebuggerAdaptor.TargetObjectToObject(EvaluationContext ctx, Object obj)
   at Mono.Debugging.Evaluation.ExpressionEvaluator.TargetObjectToExpression(EvaluationContext ctx, Object obj)
   at Mono.Debugging.Evaluation.ObjectValueAdaptor.CreateObjectValueImpl(EvaluationContext ctx, IObjectValueSource source, ObjectPath path, Object obj, ObjectValueFlags flags)
   at Mono.Debugging.Evaluation.ObjectValueAdaptor.CreateObjectValue(EvaluationContext ctx, IObjectValueSource source, ObjectPath path, Object obj, ObjectValueFlags flags)
System.OverflowException: Arithmetic operation resulted in an overflow.
   at Mono.Debugging.Soft.SoftDebuggerAdaptor.TargetObjectToObject(EvaluationContext ctx, Object obj)
   at Mono.Debugging.Evaluation.ExpressionEvaluator.TargetObjectToExpression(EvaluationContext ctx, Object obj)
   at Mono.Debugging.Evaluation.ObjectValueAdaptor.CreateObjectValueImpl(EvaluationContext ctx, IObjectValueSource source, ObjectPath path, Object obj, ObjectValueFlags flags)
   at Mono.Debugging.Evaluation.ObjectValueAdaptor.CreateObjectValue(EvaluationContext ctx, IObjectValueSource source, ObjectPath path, Object obj, ObjectValueFlags flags)
Unhandled Exception:

System.InvalidCastException: Unable to cast object of type 'UIKit.UIViewController' to type 'Cirrious.MvvmCross.Touch.Views.IMvxTouchView'.

我不知道我在这里做错了什么。有没有人有任何想法？这是安装的软件版本

Mvvm 交叉 3.5.0 Visual Studio 2012 更新 4， Xamarin 通用安装程序 v3.5.0.0 Xamarin Studio 5.7 v5.7.0.661 Xamarin v3.9.236.0

更新

我采纳了 EShy 的建议并添加了 Controller 并将其命名为 LogonView，但是我仍然遇到未构建 LogonViewModel 的问题。日志如下所示。有什么想法吗？

2015-01-29 11:31:33.579 MyApp[12631:273902] mvx:Diagnostic:286.77 Message = [Failed to construct and initialize ViewModel for type MyApp.Core.ViewModels.LogonViewModel from locator MvxDefaultViewModelLocator - check InnerException for more information]
[0:] mvx:Diagnostic:286.77 Message = [Failed to construct and initialize ViewModel for type MyApp.Core.ViewModels.LogonViewModel from locator MvxDefaultViewModelLocator - check InnerException for more information]
[0:] 
2015-01-29 11:31:33.985 MyApp[12631:273902] mvx:Diagnostic:287.17 Stack Trace = [  at Cirrious.MvvmCross.ViewModels.MvxViewModelLoader.LoadViewModel (Cirrious.MvvmCross.ViewModels.MvxViewModelRequest request, IMvxBundle savedState, IMvxViewModelLocator viewModelLocator) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.ViewModels.MvxViewModelLoader.LoadViewModel (Cirrious.MvvmCross.ViewModels.MvxViewModelRequest request, IMvxBundle savedState) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.Touch.Views.MvxViewControllerExtensionMethods.LoadViewModel (IMvxTouchView touchView) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.Views.MvxViewExtensionMethods.OnViewCreate (IMvxView view, System.Func`1 viewModelLoader) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.Touch.Views.MvxViewControllerExtensionMethods.OnViewCreate (IMvxTouchView touchView) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.Touch.Views.MvxViewControllerAdapter.HandleViewDidLoadCalled 
[0:] mvx:Diagnostic:287.17 Stack Trace = [  at Cirrious.MvvmCross.ViewModels.MvxViewModelLoader.LoadViewModel (Cirrious.MvvmCross.ViewModels.MvxViewModelRequest request, IMvxBundle savedState, IMvxViewModelLocator viewModelLocator) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.ViewModels.MvxViewModelLoader.LoadViewModel (Cirrious.MvvmCross.ViewModels.MvxViewModelRequest request, IMvxBundle savedState) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.Touch.Views.MvxViewControllerExtensionMethods.LoadViewModel (IMvxTouchView touchView) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.Views.MvxViewExtensionMethods.OnViewCreate (IMvxView view, System.Func`1 viewModelLoader) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.Touch.Views.MvxViewControllerExtensionMethods.OnViewCreate (IMvxTouchView touchView) [0x00000] in <filename unknown>:0 
  at Cirrious.MvvmCross.Touch.Views.MvxViewControllerAdapter.HandleViewDidLoadCalled (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0 
  at (wrapper delegate-invoke) <Module>:invoke_void_object_EventArgs (object,System.EventArgs)
  at Cirrious.CrossCore.Core.MvxDelegateExtensionMethods.Raise (System.EventHandler eventHandler, System.Object sender) [0x00000] in <filename unknown>:0 
  at Cirrious.CrossCore.Touch.Views.MvxEventSourceViewController.ViewDidLoad () [0x00000] in <filename unknown>:0 
  at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, IntPtr principal, IntPtr delegate) [0x00005] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:62 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:46 
  at MyApp.iOS.Application.Main (System.String[] args) [0x00002] in c:\MyApp.iOS\Main.cs:21 ]
(System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0 
  at (wrapper delegate-invoke) <Module>:invoke_void_object_EventArgs (object,System.EventArgs)
  at Cirrious.CrossCore.Core.MvxDelegateExtensionMethods.Raise (System.EventHandler eventHandler, System.Object sender) [0x00000] in <filename unknown>:0 
  at Cirrious.CrossCore.Touch.Views.MvxEventSourceViewController.ViewDidLoad () [0x00000] in <filename unknown>:0 
  at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, IntPtr principal, IntPtr delegate) [0x00005] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:62 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:46 
  at MyApp.iOS.Application.Main (System.String[] args) [0x00002] in c:\MyApp\
MyApp.iOS\Main.cs:21 ]
[0:] 
2015-01-29 11:31:34.393 MyApp[12631:273902] mvx:Diagnostic:287.58 Inner Exception message = [Problem creating viewModel of type LogonViewModel]
[0:] mvx:Diagnostic:287.58 Inner Exception message = [Problem creating viewModel of type LogonViewModel]

最佳答案

您应该在 Storyboard LogonView 中命名您的 View Controller ，而不是 LogonViewController。这就是 MvvmCross 正在寻找的 viewType.Name。

关于ios - 无法使用 iOS 中的 Storyboard让 MvvmCross 工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28199918/