C# MvvmCross-在UISlider中处理绑定时获取TargetInvocationException和SIGABRT
我正在使用Xamarin.iOS和MvvmCross（v5.6.3）进行一个项目，我在一个视图控制器上有一个非常典型的UISlider，它的值绑定到视图模型上的C# MvvmCross-在UISlider中处理绑定时获取TargetInvocationException和SIGABRT,c#,xamarin.ios,mvvmcross,uislider,C#,Xamarin.ios,Mvvmcross,Uislider,我正在使用Xamarin.iOS和MvvmCross（v5.6.3）进行一个项目，我在一个视图控制器上有一个非常典型的UISlider，它的值绑定到视图模型上的float属性 set.Bind(MySlider).For(x => x.Value).To(vm => vm.FloatProperty).TwoWay(); 当视图卸载并尝试处理现有绑定时（如导航到另一个视图模型时），我会遇到以下未处理的异常，异常为SIGABRT： Unhandled Exception: Syste
floatset.Bind(MySlider).For(x => x.Value).To(vm => vm.FloatProperty).TwoWay();
SIGABRTUnhandled Exception:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> UIKit.UIKitThreadAccessException: UIKit Consistency error: you are calling a UIKit method that can only be invoked from the UI thread.
at UIKit.UIApplication.EnsureUIThread () [0x00023] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIApplication.cs:88
at UIKit.UIControl.RemoveTarget (Foundation.NSObject target, System.IntPtr sel, UIKit.UIControlEvent events) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.g.cs:235
at UIKit.UIControl.RemoveTarget (System.EventHandler notification, UIKit.UIControlEvent events) [0x00057] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.cs:116
at UIKit.UIControl.remove_ValueChanged (System.EventHandler value) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.cs:209
at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/MonoMethod.cs:305
--- End of inner exception stack trace ---
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00046] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/MonoMethod.cs:313
at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/reflection/methodbase.cs:229
at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].RemoveEventHandler () [0x00024] in <6adc0d5857264558a9d45778a78ae02a>:0
at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].Dispose (System.Boolean disposing) [0x00003] in <6adc0d5857264558a9d45778a78ae02a>:0
at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].Dispose () [0x00000] in <6adc0d5857264558a9d45778a78ae02a>:0
at MvvmCross.Binding.iOS.Target.MvxUISliderValueTargetBinding.Dispose (System.Boolean isDisposing) [0x0001b] in <614c9ef828c14ba687a40ec2656f480f>:0
at MvvmCross.Binding.Bindings.MvxBinding.Finalize () [0x00000] in <866b1e46764b48aab0d408952a6f006f>:0
2018-04-09 23:15:20.210 MyProject.iOS[73770:3302608] Unhandled managed exception:
Exception has been thrown by the target of an invocation. (System.Reflection.TargetInvocationException)
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00046] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/MonoMethod.cs:313
at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/reflection/methodbase.cs:229
at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].RemoveEventHandler () [0x00024] in <6adc0d5857264558a9d45778a78ae02a>:0
at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].Dispose (System.Boolean disposing) [0x00003] in <6adc0d5857264558a9d45778a78ae02a>:0
at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].Dispose () [0x00000] in <6adc0d5857264558a9d45778a78ae02a>:0
at MvvmCross.Binding.iOS.Target.MvxUISliderValueTargetBinding.Dispose (System.Boolean isDisposing) [0x0001b] in <614c9ef828c14ba687a40ec2656f480f>:0
at MvvmCross.Binding.Bindings.MvxBinding.Finalize () [0x00000] in <866b1e46764b48aab0d408952a6f006f>:0
--- inner exception ---
UIKit Consistency error: you are calling a UIKit method that can only be invoked from the UI thread. (UIKit.UIKitThreadAccessException)
at UIKit.UIApplication.EnsureUIThread () [0x00023] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIApplication.cs:88
at UIKit.UIControl.RemoveTarget (Foundation.NSObject target, System.IntPtr sel, UIKit.UIControlEvent events) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.g.cs:235
at UIKit.UIControl.RemoveTarget (System.EventHandler notification, UIKit.UIControlEvent events) [0x00057] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.cs:116
at UIKit.UIControl.remove_ValueChanged (System.EventHandler value) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.cs:209
at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/MonoMethod.cs:305
2018-04-09 23:15:20.210 MyProject.iOS[73770:3302608] critical: Stacktrace:
2018-04-09 23:15:20.211 MyProject.iOS[73770:3302608] critical:
Native stacktrace:
2018-04-09 23:15:20.212 MyProject.iOS[73770:3302608] critical: 0 MyProject.iOS 0x00000001038b4574 mono_handle_native_crash + 244
2018-04-09 23:15:20.212 MyProject.iOS[73770:3302608] critical: 1 libsystem_platform.dylib 0x000000010bbecf5a _sigtramp + 26
2018-04-09 23:15:20.213 MyProject.iOS[73770:3302608] critical: 2 ??? 0x0000000103dd308a 0x0 + 4359794826
2018-04-09 23:15:20.213 MyProject.iOS[73770:3302608] critical: 3 libsystem_c.dylib 0x000000010b8820eb abort + 127
2018-04-09 23:15:20.213 MyProject.iOS[73770:3302608] critical: 4 MyProject.iOS 0x0000000103a5b2df xamarin_unhandled_exception_handler + 47
2018-04-09 23:15:20.214 MyProject.iOS[73770:3302608] critical: 5 MyProject.iOS 0x000000010391b854 mono_invoke_unhandled_exception_hook + 148
2018-04-09 23:15:20.214 MyProject.iOS[73770:3302608] critical: 6 MyProject.iOS 0x00000001039c2a3e mono_thread_internal_unhandled_exception + 110
2018-04-09 23:15:20.215 MyProject.iOS[73770:3302608] critical: 7 MyProject.iOS 0x000000010391d15a mono_gc_run_finalize + 842
2018-04-09 23:15:20.215 MyProject.iOS[73770:3302608] critical: 8 MyProject.iOS 0x00000001039fc9ba sgen_gc_invoke_finalizers + 234
2018-04-09 23:15:20.215 MyProject.iOS[73770:3302608] critical: 9 MyProject.iOS 0x000000010391eae4 finalizer_thread + 756
2018-04-09 23:15:20.215 MyProject.iOS[73770:3302608] critical: 10 MyProject.iOS 0x00000001039c3600 start_wrapper + 704
2018-04-09 23:15:20.215 MyProject.iOS[73770:3302608] critical: 11 libsystem_pthread.dylib 0x000000010bbfe6c1 _pthread_body + 340
2018-04-09 23:15:20.216 MyProject.iOS[73770:3302608] critical: 12 libsystem_pthread.dylib 0x000000010bbfe56d _pthread_body + 0
2018-04-09 23:15:20.216 MyProject.iOS[73770:3302608] critical: 13 libsystem_pthread.dylib 0x000000010bbfdc5d thread_start + 13
2018-04-09 23:15:20.216 MyProject.iOS[73770:3302608] critical:
=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
未处理的异常：
System.Reflection.TargetInvocationException:调用的目标已引发异常。-->UIKit.UIKitThreadAccessException:UIKit一致性错误：您正在调用只能从UI线程调用的UIKit方法。
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIApplication.cs:88中的UIKit.UIApplication.EnsureUIThread（）[0x00023]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.g.cs:235中的UIKit.UIControl.RemoveTarget（Foundation.NSObject target、System.IntPtr sel、UIKit.UIControl事件）[0x00000
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.cs:116中的UIKit.UIControl.RemoveTarget（System.EventHandler通知，UIKit.UIControl事件）[0x00057]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.cs中的UIKit.UIControl.remove_值已更改（System.EventHandler值）[0x00000]
在（包装器管理为本机）System.Reflection.MonoMethod.InternalInvoke（System.Reflection.MonoMethod，object，object[]，System.Exception&）
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/MonoMethod.cs:305中的System.Reflection.monmethod.Invoke（System.Object obj，System.Reflection.BindingFlags invokeAttr，System.Reflection.Binder Binder，System.Object[]参数，System.Globalization.CultureInfo-culture-info-culture）[0x00032]
---内部异常堆栈跟踪的结束---
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/MonoMethod.cs:313中的System.Reflection.monmethod.Invoke（System.Object obj，System.Reflection.BindingFlags invokeAttr，System.Reflection.Binder Binder，System.Object[]参数，System.Globalization.CultureInfo-culture-info-culture）[00046]处
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/System/Reflection/MethodBase.cs:229中的System.Reflection.MethodBase.Invoke（System.Object obj，System.Object[]参数）[0x00000]
在MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].RemoveEventHandler（）[0x00024]中：0
在MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].Dispose（System.Boolean disposing）[0x00003]中：0
在MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].Dispose（）[0x00000]中：0
在：0中的MvvmCross.Binding.iOS.Target.MvxUISliderValueTargetBinding.Dispose（System.Boolean isDisposing）[0x0001b]处
在：0中的MvvmCross.Binding.Bindings.MvxBinding.Finalize（）[0x00000]处
2018-04-09 23:15:20.210 MyProject.iOS[73770:3302608]未处理的托管异常：
调用的目标已引发异常。（系统.反射.目标异常）
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/MonoMethod.cs:313中的System.Reflection.monmethod.Invoke（System.Object obj，System.Reflection.BindingFlags invokeAttr，System.Reflection.Binder Binder，System.Object[]参数，System.Globalization.CultureInfo-culture-info-culture）[00046]处
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/System/Reflection/MethodBase.cs:229中的System.Reflection.MethodBase.Invoke（System.Object obj，System.Object[]参数）[0x00000]
在MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].RemoveEventHandler（）[0x00024]中：0
在MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].Dispose（System.Boolean disposing）[0x00003]中：0
在MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`1[TSource].Dispose（）[0x00000]中：0
在：0中的MvvmCross.Binding.iOS.Target.MvxUISliderValueTargetBinding.Dispose（System.Boolean isDisposing）[0x0001b]处
在：0中的MvvmCross.Binding.Bindings.MvxBinding.Finalize（）[0x00000]处
---内部异常---
UIKit一致性错误：您正在调用只能从UI线程调用的UIKit方法。（UIKit.uikitthreadsaccessexception）
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIApplication.cs:88中的UIKit.UIApplication.EnsureUIThread（）[0x00023]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.g.cs:235中的UIKit.UIControl.RemoveTarget（Foundation.NSObject target、System.IntPtr sel、UIKit.UIControl事件）[0x00000
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.cs:116中的UIKit.UIControl.RemoveTarget（System.EventHandler通知，UIKit.UIControl事件）[0x00057]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIControl.cs中的UIKit.UIControl.remove_值已更改（System.EventHandler值）[0x00000]
在（包装器管理为本机）System.Reflection.MonoMethod.InternalInvoke（System.Reflection.MonoMethod，object，object[]，System.Exception&）
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/MonoMethod.cs:305中的System.Reflection.monmethod.Invoke（System.Object obj，System.Reflection.BindingFlags invokeAttr，System.Reflection.Binder Binder，System.Object[]参数，System.Globalization.CultureInfo-culture-info-culture）[0x00032]
2018-04-09 23:
this.InvokeOnMainThread(async () =>
{
//navigate
});
var previous = UIApplication.CheckForIllegalCrossThreadCalls;
UIApplication.CheckForIllegalCrossThreadCalls = false;
//navigate
UIApplication.CheckForIllegalCrossThreadCalls = previous;
public class FixedMvxUISliderValueTargetBinding : MvxPropertyInfoTargetBinding<UISlider>
{
private IDisposable _subscription;
public FixedMvxUISliderValueTargetBinding(object target, PropertyInfo targetPropertyInfo)
: base(target, targetPropertyInfo) { }
protected override void SetValueImpl(object target, object value)
{
var view = target as UISlider;
if (view == null) return;
view.Value = (float)value;
}
private void HandleSliderValueChanged(object sender, EventArgs e)
{
var view = View;
if (view == null) return;
FireValueChanged(view.Value);
}
public override MvxBindingMode DefaultMode => MvxBindingMode.TwoWay;
public override void SubscribeToEvents()
{
var slider = View;
if (slider == null)
{
MvxBindingTrace.Trace(
MvxTraceLevel.Error,
"Error - UISlider is null in MvxUISliderValueTargetBinding");
return;
}
_subscription = slider.WeakSubscribe(
nameof(slider.ValueChanged),
HandleSliderValueChanged);
}
protected override void Dispose(bool isDisposing)
{
base.Dispose(isDisposing);
if (isDisposing)
{
_subscription?.Dispose();
_subscription = null;
}
}
}
protected override void FillTargetFactories(IMvxTargetBindingFactoryRegistry registry)
{
base.FillTargetFactories(registry);
registry.RegisterPropertyInfoBindingFactory(
typeof(FixedMvxUISliderValueTargetBinding),
typeof(UISlider),
nameof(UISlider.Value));
}