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使用MFMailComposeViewController时，Monotouch iOS 6崩溃

objective-cios6xamarin.iosmfmailcomposeviewcontroller
4

我在使用Monotouch iOS 6中的MFMailComposeViewController时遇到了一个奇怪的错误，但在iOS 5.1中它可以正常工作：

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

这里是代码：

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

同时在模拟器上，应用程序会在调试器抛出异常并崩溃之前挂起一段时间：

    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, Int32 command, 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, IObjectValueSource source, ObjectPath path, System.Object obj, 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

设备上的本地堆栈跟踪：
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

感谢您的帮助。

更新:

不幸的是，这里可能存在多个错误。

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引起的。我测试了所有可能的连接，但我的代码仍然崩溃。

因此，我开始逐行注释我的所有代码，并找到了问题所在：

这是应用内购买代码。

我正在使用来自xamarin网站的应用内购买示例代码。

如果我只注释掉使用SKProductRequest类的这一行：

productsRequest.Start();

MFMailComposer打开并正常工作！

因此，我在原始的Xamarin示例项目上测试了MFMailComposer：

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

我刚刚把这段代码添加到NonConsumableViewController类中：

/// <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, 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 ();
                }
            };
            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的热修复（很抱歉让你等待，但我必须将代码恢复到原始状态）。外观bug现在已经消失了。
SKProductRequest类的问题似乎是另一个不太紧急的问题。它不会挂起，只是延迟了一段时间才打开MF邮件组合器。但这似乎是一个无关的bug。
这是bug引用： https://bugzilla.xamarin.com/show_bug.cgi?id=7443
你能展示完整的堆栈跟踪吗？ - Rolf Bjarne Kvinge
我认为这可能与将null回调传递给PresentViewController有关。您能否在其中放置delegate { }（基本上是一个空函数）以查看是否可以修复它？ - jonathanpeppers
尝试了使用空委托的建议，但没有帮助。 - Emanuele Sabetta
1
我认为你应该提交一个包含完整示例的错误报告到Xamarin的bugzilla.xamarin.com，以便进行调查。 - Krumelur
我可以重现这个问题。我会提交一个错误报告。 - Nic Wise
1
https://bugzilla.xamarin.com/show_bug.cgi?id=7443 - Nic Wise
1个回答
2
这可能会有所帮助（来自Xamarin bug）。
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);

如果我在代码中有注释的部分，就会出现问题，但如果将其注释掉就不会出现问题。你是否正在使用UIAppearance？
这已经固定，并将成为MonoTouch 6.0.2的一部分。对于使用6.0.1的人，漏洞报告中提供了一个热修复程序。 - poupou
不幸的是，这并没有解决我的问题。我没有使用任何外观或文本属性。还有另一个错误导致我的MFComposer崩溃，我隔离了一行代码，如果注释掉它就会停止。如果我只注释掉使用SKProductRequest类的这一行：productsRequest.Start(); MFComposer可以正常工作而不会崩溃。 - Emanuele Sabetta
我尝试了热修复（很抱歉让你等待，但是我不得不将我的代码恢复到原始状态）。外观错误已经消失了，谢谢。关于SKProductRequest类的问题似乎是另一个不太紧急的问题。它不会卡住，只是会延迟打开MF邮件编辑器一段时间。但这似乎是一个无关的错误。 - Emanuele Sabetta
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