objective-c – 使用MFMailComposeViewController时Monotouch iOS 6崩溃

我在Monotouch iOS 6中使用MFMailComposeViewController时出现了一个奇怪的错误,但它在iOS 5.1中运行良好：

*** Assertion failure in NSDictionary *_UIRecordArgumentOfInvocationATindex(NSInvocation *,NSUInteger,BOOL)(),/sourceCache/UIKit/UIKit-2372/UIAppearance.m:1118

这是代码：

@H_359_7@mFMailComposeViewController _mail; public void SendFeedBACkMail (String email_subject,String email_message_body,String[] email_recipients) { if (MFMailComposeViewController.CanSendMail) { _mail = new MFMailComposeViewController (); _mail.SetSubject (email_subject); _mail.SetToRecipients (email_recipients); _mail.SetmessageBody (email_message_body + "\n",falsE); _mail.Finished += HandleMailFinished; root_controller.PresentViewController(_mail,true,null); } else { //handle not being able to send mail UIAlertView alert = new UIAlertView ("Mail Alert","Error: check your eMail configuration",null,"OK",null); alert.Show (); } }

模拟器上的本机堆栈跟踪：

Native stacktrace:

0   MyAppProject                        0x0007ba5c mono_handle_native_sigsegv + 284
1   MyAppProject                        0x00004a62 mono_sigsegv_signal_handler + 178
2   libsystem_c.dylib                   0x93ad486b _sigtramp + 43
3   ???                                 0xffffffff 0x0 + 4294967295
4   MyAppProject                        0x0014e8be mono_runtime_invoke + 126
5   MyAppProject                        0x001ec80f monotouch_exception_handler + 63
6   CoreFoundation                      0x020e0318 __handleUncaughtException + 728
7   libobjc.A.dylib                     0x0228d0b9 _ZL15_objc_terminatev + 86
8   libstdc++.6.dylib                   0x0289e652 _ZSt9terminatev + 21
9   libobjc.A.dylib                     0x0228d039 _destroyAltHandlerList + 0
10  libdispatch.dylib                   0x0299d027 _dispatch_client_callout + 33
11  libdispatch.dylib                   0x0298cd5f _dispatch_barrier_sync_f_invoke + 58
12  libdispatch.dylib                   0x0298caa3 dispatch_barrier_sync_f + 108
13  libdispatch.dylib                   0x0298ce5e dispatch_sync + 45
14  UIKit                               0x00f7ffad __76-[_UIRemoteViewControllerConnectionrequest _connectToViewControllerOperator]_block_invoke_0 + 105
15  UIKit                               0x00f8be46 __block_global_0 + 54
16  libdispatch.dylib                   0x0299d014 _dispatch_client_callout + 14
17  libdispatch.dylib                   0x0298f09f dispatch_once_f + 57
18  libdispatch.dylib                   0x0298f061 dispatch_once + 31
19  UIKit                               0x00f8be0a __73-[_UIViewserviceSessionEndpoint connectToDeputyOfType:connectionHandler:]_block_invoke_0 + 105
20  UIKit                               0x00f8c002 __73-[_UIViewserviceSessionEndpoint connectToDeputyOfType:connectionHandler:]_block_invoke_040 + 25
21  UIKit                               0x00fe94e9 __block_global_0 + 32
22  libdispatch.dylib                   0x0298b53f _dispatch_call_block_and_release + 15
23  libdispatch.dylib                   0x0299d014 _dispatch_client_callout + 14
24  libdispatch.dylib                   0x0298d418 _dispatch_queue_drain + 239
25  libdispatch.dylib                   0x0298d2a6 _dispatch_queue_invoke + 59
26  libdispatch.dylib                   0x0298e280 _dispatch_root_queue_drain + 231
27  libdispatch.dylib                   0x0298e450 _dispatch_worker_thread2 + 39
28  libsystem_c.dylib                   0x93aeae12 _pthread_wqthread + 441
29  libsystem_c.dylib                   0x93ad2cca start_wqthread + 30

同样在模拟器上,应用程序会挂起一段时间,然后在调试器上抛出异常并崩溃：

@H_359_7@mono.Debugger.soft.VMDisconnectedException: Exception of type 'Mono.Debugger.soft.VMDisconnectedException' was thrown. at Mono.Debugger.soft.Connection.SendReceive (CommandSet command_set,Int32 command,Mono.Debugger.soft.PacketWriter packet) [0x00117] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/contrib/Mono.Debugger.soft/Mono.Debugger.soft/Connection.cs:1420 at Mono.Debugger.soft.Connection.Type_GetCustomAttributes (Int64 id,Int64 attr_type_id,Boolean inherit) [0x00000] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/contrib/Mono.Debugger.soft/Mono.Debugger.soft/Connection.cs:1986 at Mono.Debugger.soft.TypeMirror.GetCAttrs (Mono.Debugger.soft.TypeMirror type,Boolean inherit) [0x0003d] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/contrib/Mono.Debugger.soft/Mono.Debugger.soft/TypeMirror.cs:679 at Mono.Debugger.soft.TypeMirror.GetCustomAttributes (Boolean inherit) [0x00000] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/contrib/Mono.Debugger.soft/Mono.Debugger.soft/TypeMirror.cs:664 at Mono.Debugging.soft.softDebuggerAdaptor.onGetTypeDisplayData (Mono.Debugging.Evaluation.EvaluationContext gctx,System.object typE) [0x0001e] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/src/addins/MonoDevelop.Debugger.soft/Mono.Debugging.soft/SoftDebuggerAdaptor.cs:1066 Application Terminated Mono.Debugger.soft.VMDisconnectedException: Exception of type 'Mono.Debugger.soft.VMDisconnectedException' was thrown. at Mono.Debugger.soft.Connection.SendReceive (CommandSet command_set,Mono.Debugger.soft.PacketWriter packet) [0x0013f] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/contrib/Mono.Debugger.soft/Mono.Debugger.soft/Connection.cs:1425 at Mono.Debugger.soft.Connection.Type_getmethodsByNameFlags (Int64 id,System.String name,Int32 flags,Boolean ignoreCasE) [0x00016] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/contrib/Mono.Debugger.soft/Mono.Debugger.soft/Connection.cs:2002 at Mono.Debugger.soft.TypeMirror.getmethodsByNameFlags (System.String name,BindingFlags flags,Boolean ignoreCasE) [0x0001c] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/contrib/Mono.Debugger.soft/Mono.Debugger.soft/TypeMirror.cs:691 at Mono.Debugging.soft.softDebuggerAdaptor.overloadResolve (Mono.Debugging.soft.softEvaluationContext ctx,System.String methodName,Mono.Debugger.soft.TypeMirror type,Mono.Debugger.soft.TypeMirror[] argtypes,Boolean allowInstance,Boolean allowStatic,Boolean throwIfNotFound) [0x00073] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/src/addins/MonoDevelop.Debugger.soft/Mono.Debugging.soft/SoftDebuggerAdaptor.cs:1231 at Mono.Debugging.soft.softDebuggerAdaptor.CallToString (Mono.Debugging.Evaluation.EvaluationContext ctx,System.object obj) [0x00107] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/src/addins/MonoDevelop.Debugger.soft/Mono.Debugging.soft/SoftDebuggerAdaptor.cs:91 at Mono.Debugging.Evaluation.objectValueAdaptor.TargetObjectToObject (Mono.Debugging.Evaluation.EvaluationContext ctx,System.object obj) [0x00349] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/src/core/Mono.Debugging/Mono.Debugging.Evaluation/ObjectValueAdaptor.cs:980 at Mono.Debugging.soft.softDebuggerAdaptor.TargetObjectToObject (Mono.Debugging.Evaluation.EvaluationContext gctx,System.object obj) [0x001a5] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/src/addins/MonoDevelop.Debugger.soft/Mono.Debugging.soft/SoftDebuggerAdaptor.cs:1400 at Mono.Debugging.Evaluation.ExpressionEvaluator.TargetObjectToExpression (Mono.Debugging.Evaluation.EvaluationContext ctx,System.object obj) [0x00000] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/src/core/Mono.Debugging/Mono.Debugging.Evaluation/ExpressionEvaluator.cs:83 at Mono.Debugging.Evaluation.objectValueAdaptor.CreateObjectValueImpl (Mono.Debugging.Evaluation.EvaluationContext ctx,IObjectValuesource source,ObjectPath path,System.object obj,ObjectValueFlags flags) [0x000f5] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/src/core/Mono.Debugging/Mono.Debugging.Evaluation/ObjectValueAdaptor.cs:385 at Mono.Debugging.Evaluation.objectValueAdaptor.CreateObjectValue (Mono.Debugging.Evaluation.EvaluationContext ctx,ObjectValueFlags flags) [0x00000] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0.4-branch/ea010826/source/monodevelop/main/src/core/Mono.Debugging/Mono.Debugging.Evaluation/ObjectValueAdaptor.cs:93

设备上的本机堆栈跟踪：

0   MyAppProject                        0x01b39e85 mono_handle_native_sigsegv + 244
1   MyAppProject                        0x01afe3cf mono_sigsegv_signal_handler + 130
2   libsystem_c.dylib                   0x3aaa8e93 _sigtramp + 42
3   MyAppProject                        0x01b92a9d mono_domain_get + 20
4   MyAppProject                        0x01b5d53b mono_runtime_invoke + 90
5   MyAppProject                        0x01bbd8c0 monotouch_exception_handler + 72
6   CoreFoundation                      0x36cee57f <redacted> + 614
7   libobjc.A.dylib                     0x34ffea65 <redacted> + 128
8   libc++abi.dylib                     0x33e4807b <redacted> + 78
9   libc++abi.dylib                     0x33e48114 <redacted> + 19
10  libc++abi.dylib                     0x33e49513 __cxa_throw + 122
11  libobjc.A.dylib                     0x34ffe9bf objc_exception_throw + 94
12  CoreFoundation                      0x36cee15d <redacted> + 0
13  Foundation                          0x3477030b <redacted> + 86
14  UIKit                               0x3834a925 <redacted> + 1844
15  UIKit                               0x38349a7b <redacted> + 634
16  CoreFoundation                      0x36ceb62f <redacted> + 714
17  UIKit                               0x383497f5 <redacted> + 136
18  UIKit                               0x384275e5 <redacted> + 60
19  UIKit                               0x383b5cd7 <redacted> + 206
20  UIKit                               0x383b5b6d <redacted> + 264
21  libdispatch.dylib                   0x359e29f7 <redacted> + 30
22  UIKit                               0x383b5a61 <redacted> + 92
23  UIKit                               0x383bf0d5 <redacted> + 32
24  libdispatch.dylib                   0x359e43f7 <redacted> + 42
25  UIKit                               0x383bf0b1 <redacted> + 88
26  libdispatch.dylib                   0x359df11f <redacted> + 10
27  libdispatch.dylib                   0x359e2ecf <redacted> + 142
28  libdispatch.dylib                   0x359e2dc1 <redacted> + 40
29  libdispatch.dylib                   0x359e391d <redacted> + 184
30  libdispatch.dylib                   0x359e3ac1 <redacted> + 84
31  libsystem_c.dylib                   0x3aa76a11 <redacted> + 360
32  libsystem_c.dylib                   0x3aa768a4 start_wqthread + 8

任何帮助表示赞赏.
谢谢.

更新：

不幸的是,这里似乎有多个错误.

在我的情况下,邮件编辑器的崩溃不是由外观或
属性字符串.我测试了所有可能的连接,但我的代码崩溃了.

所以我开始逐行评论我的所有代码,然后我把它钉了下来：

这是In App Purchase代码.

我正在使用Xamarin网站上的In App Purchase示例中的代码.

如果我使用SKProductrequest类只注释这一行：

productsrequest.Start();

@H_378_5@mFMailComposer打开并完美运行！

所以我在最初的Xamarin示例项目中测试了MFMailComposer：

http://docs.xamarin.com/ios/tutorials/In-App_Purchasing
http://docs.xamarin.com/@api/deki/files/3300/=InAppPurchaseSample.zip

我刚刚将此代码添加到NonConsumableViewController类：

/// <sumMary>
        /// TEST MAIL COMPOSER BUG - START
        /// </sumMary>

        MFMailComposeViewController _mail;

        void HandleFinished (object sender,MFComposeResultEventArgs E)
        {

        }

        public void TestMailComposer ()
        {
            var button = UIButton.FromType(UIButtonType.RoundedRect);
            button.Frame = new RectangleF(20f,0f,280f,40f);
            button.TouchUpInside += (object sender,EventArgs E) => {
                if (MFMailComposeViewController.CanSendMail) {
                    _mail = new MFMailComposeViewController ();
                    _mail.SetSubject ("The Subject");
                    _mail.SetToRecipients (new [] {"the@recipient.com"});
                    _mail.SetmessageBody ("Some text to e-mail stuff too" +
"\n",falsE);
                    _mail.Finished += HandleFinished;

                    this.PresentViewController(_mail,null);

                } else {
                    //handle not being able to send mail
                    UIAlertView alert = new UIAlertView ("Mail Alert","Error:
check your eMail configuration",null);
                    alert.Show ();
                }
            };
            button.Settitle("Button",UIControlState.Normal);
            View.AddSubview(button);
        }

        ///
        /// TEST MAIL COMPOSER BUG - END
        ///

当我按下按钮时,它会挂起.

更新：

我尝试了6.0.2修补程序(抱歉等待,但我不得不将我的代码恢复到原始状态).外观错误现在消失了.

SKProductrequest类的问题似乎不同而且不太紧急.它没有挂起,只是推迟了MF Mail作曲家的开放一段时间.但这似乎是一个无关的错误.

这是bug参考：
https://bugzilla.xamarin.com/show_bug.cgi?id=7443

cancelAttributes = new UITextAttributes();
//cancelAttributes.TextShadowOffset = new UIOffset(0,-1);
cancelAttributes.TextShadowColor = UIColor.White.ColorWithAlpha(0.5f);
cancelAttributes.TextColor = resources.CancelButtonDisabled;

UIBarButtonItem.AppearanceWhenContainedIn(typeof(UISearchBar)).SettitleTextAttributes(cancelAttributes,UIControlState.Disabled);