我得到一个奇怪的错误，当我在MonoTouch的使用MFMailComposeViewController的iOS 6，但它的iOS 5.1工作得很好：
*** Assertion failure in NSDictionary *_UIRecordArgumentOfInvocationAtIndex(NSInvocation *, NSUInteger, BOOL)(), /SourceCache/UIKit/UIKit-2372/UIAppearance.m:1118
下面是代码：
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 ();
}
}
在模拟器上本地堆栈跟踪：
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
同样在模拟器中的应用程序挂起的调试器和崩溃抛出异常前一段时间：
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
在设备上本地堆栈跟踪：
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
任何帮助表示赞赏。 谢谢。
更新：
不幸的是它似乎有一个以上的错误在这里。
在我的情况下，邮件撰写的崩溃不是由外观或属性串引起的。 我测试了所有可能的连接，但我的代码崩溃。
于是，我开始通过注释行中的所有我的代码行，我钉它：
这是In App Purchase的代码。
我使用的是从xamarin网站上的应用程序内购买示例代码。
如果我的评论只是用SKProductRequest类这一行：
productsRequest.Start（）;
该MFMailComposer打开和运行完美！
所以，我测试的MFMailComposer原始Xamarin示例项目：
http://docs.xamarin.com/ios/tutorials/In-App_Purchasing http://docs.xamarin.com/@api/deki/files/3300/=InAppPurchaseSample.zip
我只是说此代码到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, 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
///
当我按下按钮它挂起。
更新：
我试过6.0.2修补程序（对不起，等待，但我不得不恢复我的代码到原来的状态）。 外观缺陷已经不复存在了。
与SKProductRequest类的问题似乎一个不同的和不那么紧迫。 它不挂，它只是延缓了MF邮件作曲家一会儿开幕。 但是，这似乎是一个无关的错误。
这是错误的参考： https://bugzilla.xamarin.com/show_bug.cgi?id=7443
