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我们在 Mobile Iron iOS 设备上遇到了一个奇怪的问题，每次加载包含 UITextview 控件的屏幕时应用程序都会崩溃，其他屏幕工作正常。

当安装在非移动熨斗设备上时，该应用程序运行良好。

提前感谢您为进一步调试此问题提供任何帮助。

更多信息：

以下是崩溃日志片段：

13/08/2018 07:14:26 AM - MOB_APPLICATION - Error   Description: Error in AddControl with WizardAttributeId = 688 due to = , Message :The ObjectiveC class 'ACTextViewDelegateProxy' could not be registered, it does not seem to derive from any known ObjectiveC class (including NSObject)., StackTrace :  at MOB_APPLICATION.iOS.CustomControls.TextViewControl.configureTextView (System.String controlLabel) <0x104b04b50 + 0x00dd0> in <43ca0360be2c4376b18eba301a6ce7cc#2d993c574819398378e4eeb47a646433>:0 
  at MOB_APPLICATION.iOS.CustomControls.TextViewControl..ctor (MOB_APPLICATION.Shared.Model.WizardAttribute model, System.Int64 assetID, UIKit.UIViewController controller, System.String controlLabel) <0x104b04800 + 0x001f3> in <43ca0360be2c4376b18eba301a6ce7cc#2d993c574819398378e4eeb47a646433>:0 
  at MOB_APPLICATION.iOS.CustomControls.Control.AddControl (MOB_APPLICATION.Shared.Model.WizardAttribute attributeModel, System.Int32& controlHeight, UIKit.UIViewController controller, System.Int64 assetID, System.Boolean isAttrHistoryTime, System.Boolean isGrid, System.String controlLabel) <0x104ad45d0 + 0x014f7> in <43ca0360be2c4376b18eba301a6ce7cc#2d993c574819398378e4eeb47a646433>:0    DeviceInfo: iPhone | 11.4.1 | XXXXXXXXXXXXXXXXXXXXXXXXXXXXX | 1.0.74.2v

13/08/2018 07:14:26 AM - MOB_APPLICATION - Error   Description: Error in configureTextView with WizardAttributeId = 688 due to = , Message :The ObjectiveC class 'ACTextViewDelegateProxy' could not be registered, it does not seem to derive from any known ObjectiveC class (including NSObject)., StackTrace :  at Registrar.DynamicRegistrar.Lookup (System.IntPtr class, System.Boolean throw_on_error) <0x105002880 + 0x001e8> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at ObjCRuntime.Class.Lookup (System.IntPtr klass, System.Boolean throw_on_error) <0x105022b30 + 0x00033> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at ObjCRuntime.Class.Lookup (System.IntPtr klass) <0x105022b00 + 0x00017> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at ObjCRuntime.Runtime.ConstructNSObject (System.IntPtr ptr, System.IntPtr klass, ObjCRuntime.Runtime+MissingCtorResolution missingCtorResolution) <0x104ffb3e0 + 0x0001f> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at ObjCRuntime.Runtime.GetNSObject (System.IntPtr ptr, ObjCRuntime.Runtime+MissingCtorResolution missingCtorResolution, System.Boolean evenInFinalizerQueue) <0x104ffbc30 + 0x00077> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at ObjCRuntime.Runtime.GetNSObject (System.IntPtr ptr) <0x104ffbc00 + 0x0001b> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at UIKit.UITextView.get_WeakDelegate () <0x104fec7f0 + 0x0006b> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at UIKit.UITextView.get_Delegate () <0x104fea980 + 0x0001f> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at UIKit.UITextView.EnsureUITextViewDelegate () <0x104feccf0 + 0x0001b> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at UIKit.UITextView.get_ShouldBeginEditing () <0x104fecf50 + 0x00013> in <b7935acd70e343049845d6fd73e5ec44#2d993c574819398378e4eeb47a646433>:0 
  at MOB_APPLICATION.iOS.CustomControls.TextViewControl.configureTextView (System.String controlLabel) <0x104b04b50 + 0x00793> in <43ca0360be2c4376b18eba301a6ce7cc#2d993c574819398378e4eeb47a646433>:0    DeviceInfo: iPhone | 11.4.1 | XXXXXXXXXXXXXXXXXXXXXXXXXXXXX | 1.0.74.2v

关于上述堆栈跟踪中的“消息：ObjectiveC 类 'ACTextViewDelegateProxy' 无法注册，它似乎不是从任何已知的 ObjectiveC 类（包括 NSObject）派生的”是什么。

该应用程序。基于 Xamarin.iOS 平台构建。

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