MonoTouchexception没有被设备捕获

我正在开发一个以前不使用Storyboard开发的应用程序，即所有视图都是用代码创建的。 因此，根据此链接，我正在尝试将自定义MvxTouchViewsContainer传递给MvxTouchSetup.CreateTouchViewsContainer 。

 protected override IMvxTouchView CreateViewOfType(Type viewType, MvxViewModelRequest request) { UIStoryboard storyboard; try { storyboard = UIStoryboard.FromName(viewType.Name, null); } catch (Exception) { try { storyboard = UIStoryboard.FromName("MainStoryBoard_iPhone", null); } catch (Exception) { return base.CreateViewOfType (viewType, request); } } IMvxTouchView resultView = null; try { resultView = (IMvxTouchView) storyboard.InstantiateViewController(viewType.Name); } catch(Exception) { resultView = base.CreateViewOfType (viewType, request); } return resultView; } 

基本上我试图找到一个故事板，如果存在，否则我回退到从代码加载视图。 try-catchexception在模拟器中工作正常。 但是，在实际的iOS设备上运行并且应用程序崩溃时，exception不会被捕获。

我得到一个包含NSInvalidArgumentException的MonoTouch.Foundation.MonoTouchException，这基本上是预期的，因为某些视图可能没有与它们关联的故事板。

这是一个Xamarin bug吗？

Answer 1

使用自定义属性比try / catch方法效果更好：

 public class FromStoryboardAttribute : Attribute { public string StoryboardName { get; set; } public FromStoryboardAttribute(string storyboardName = null) { StoryboardName = storyboardName; } } 

这是StoryBoardContainer ：

 public class StoryBoardContainer : MvxTouchViewsContainer { protected override IMvxTouchView CreateViewOfType(Type viewType, MvxViewModelRequest request) { var storyboardAttribute = viewType.GetCustomAttribute(); if (storyboardAttribute != null) { var storyboard = UIStoryboard.FromName(storyboardAttribute.StoryboardName ?? viewType.Name, null); var viewController = storyboard.InstantiateViewController(viewType.Name); return (IMvxTouchView) viewController; } return base.CreateViewOfType(viewType, request); } } 

用法：

 // Will look for a UIViewController with identifier "MyView" inside a Storyboard named "MyView.storyboard" [FromStoryboard] public class MyView : MvxViewController { public MyView(IntPtr handle) : base(handle) {} } // Will look for a UIVIewController with identifier "MyOtherViewInSameStoryboard" inside a Storyboard named "MyView.storyboard" [FromStoryboard(StoryboardName = "MyView")] public class MyOtherViewInSameStoryboard : MvxViewController { public MyOtherViewInSameStoryboard(IntPtr handle) : base(handle) {} }