我目前遇到了iOS模拟器的问题。
我目前正在开发一个带有绑定Objective-C库（ECSlidingViewController）的Xamarin项目。我为armv7，armv7s，simulator和arm64架构构建了库，将它们组合成一个胖二进制文件并使用Xamarin绑定项目绑定它。
现在绑定在大多数情况下工作正常，除了一个小花絮。每当我子类化绑定库中包含的ECSlidingViewController类并尝试在我的应用程序中使用子类时，应用程序在我尝试调用AnchorTopViewToRightAnimated(bool animated)时终止。所有其他属性和方法都可以正常工作。
方法绑定如下：
[BaseType (typeof (UIViewController))]
interface ECSlidingViewController {
//...
[Export ("anchorTopViewToRightAnimated:")]
void AnchorTopViewToRightAnimated (bool animated);
}
这只发生在模拟器上，并且仅在访问子类上的方法时（即使该子类被转换为它的父类型）。在非子类ECSlidingViewController实例上调用或在设备上运行时，它可以正常工作。应用程序终止后，调试输出不包含任何相关错误。我能找到的唯一信息是OS X控制台中的崩溃日志：
Process: TTWebApp [851]
Path: /Users/USER/Library/Application Support/iPhone Simulator/*/TTWebApp.app/TTWebApp
Identifier: TTWebApp
Version: 0
Code Type: X86 (Native)
Parent Process: launchd_sim [819]
User ID: 501
Date/Time: 2014-02-06 09:35:01.372 +0100
OS Version: Mac OS X 10.8.5 (12F37)
Report Version: 10
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Application Specific Information:
iPhone Simulator 463.9.4.2, iPhone OS 7.0.3 (iPad/11B508)
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 CoreFoundation 0x04f3fb71 CFRetain + 113
1 ??? 0x123b5e18 0 + 305880600
2 ??? 0x123b5b28 0 + 305879848
3 ??? 0x123b5d76 0 + 305880438
4 TTWebApp 0x00167484 mono_jit_runtime_invoke + 820 (mini.c:6622)
5 TTWebApp 0x0020207f mono_runtime_invoke + 127 (object.c:2827)
6 TTWebApp 0x002a554a get_delegate_for_block_parameter + 138 (monotouch-glue.m:292)
7 TTWebApp 0x002ac8f7 monotouch_trampoline + 1847 (.monotouch-trampoline-setup-callstack.inc:70)
8 TTWebApp 0x0007d3f7 -[ECSlidingViewController anchorTopViewToRightAnimated:] + 49 (ECSlidingViewController.m:412)
9 ??? 0x120f6688 0 + 302999176
10 ??? 0x120f7fc4 0 + 303005636
11 ??? 0x120f7daf 0 + 303005103
12 ??? 0x120f7d38 0 + 303004984
13 ??? 0x0fee1cef 0 + 267263215
14 TTWebApp 0x00167484 mono_jit_runtime_invoke + 820 (mini.c:6622)
15 TTWebApp 0x0020207f mono_runtime_invoke + 127 (object.c:2827)
16 TTWebApp 0x002ad21a monotouch_trampoline + 4186 (.monotouch-trampoline-invoke.inc:1)
17 libobjc.A.dylib 0x04d8f874 -[NSObject performSelector:withObject:withObject:] + 77
18 UIKit 0x032eb0c2 -[UIApplication sendAction:to:from:forEvent:] + 108
19 UIKit 0x035bfc9b -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 139
20 libobjc.A.dylib 0x04d8f874 -[NSObject performSelector:withObject:withObject:] + 77
21 UIKit 0x032eb0c2 -[UIApplication sendAction:to:from:forEvent:] + 108
22 UIKit 0x032eb04e -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
23 UIKit 0x033e30c1 -[UIControl sendAction:to:forEvent:] + 66
24 UIKit 0x033e3484 -[UIControl _sendActionsForEvents:withEvent:] + 577
25 UIKit 0x033e2733 -[UIControl touchesEnded:withEvent:] + 641
26 UIKit 0x0332851d -[UIWindow _sendTouchesForEvent:] + 852
27 UIKit 0x03329184 -[UIWindow sendEvent:] + 1232
28 UIKit 0x032fce86 -[UIApplication sendEvent:] + 242
29 UIKit 0x032e718f _UIApplicationHandleEventQueue + 11421
30 CoreFoundation 0x04f4d83f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
31 CoreFoundation 0x04f4d1cb __CFRunLoopDoSources0 + 235
32 CoreFoundation 0x04f6a29e __CFRunLoopRun + 910
33 CoreFoundation 0x04f69ac3 CFRunLoopRunSpecific + 467
34 CoreFoundation 0x04f698db CFRunLoopRunInMode + 123
35 GraphicsServices 0x0654f9e2 GSEventRunModal + 192
36 GraphicsServices 0x0654f809 GSEventRun + 104
37 UIKit 0x032e9d3b UIApplicationMain + 1225
38 ??? 0x10eefb00 0 + 284097280
39 ??? 0x10eedc1c 0 + 284089372
40 ??? 0x10eed7f8 0 + 284088312
41 ??? 0x10eed937 0 + 284088631
42 TTWebApp 0x00167484 mono_jit_runtime_invoke + 820 (mini.c:6622)
43 TTWebApp 0x0020207f mono_runtime_invoke + 127 (object.c:2827)
44 TTWebApp 0x002078c7 mono_runtime_exec_main + 391 (object.c:4050)
45 TTWebApp 0x00207694 mono_runtime_run_main + 628 (object.c:3678)
46 TTWebApp 0x000d135d mono_jit_exec + 93 (driver.g.c:1009)
47 TTWebApp 0x0029f7e4 main + 2788 (main.m:489)
48 libdyld.dylib 0x05a7c725 start + 1
Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0 libsystem_kernel.dylib 0x05c4c9ca kevent64 + 10
1 libdispatch.dylib 0x057c6f3e _dispatch_mgr_invoke + 238
2 libdispatch.dylib 0x057c6c7a _dispatch_mgr_thread + 60
Thread 2:
0 libsystem_kernel.dylib 0x05c4c0ee __workq_kernreturn + 10
1 libsystem_c.dylib 0x05b090ac _pthread_workq_return + 45
2 libsystem_c.dylib 0x05b08e79 _pthread_wqthread + 448
3 libsystem_c.dylib 0x05af0daa start_wqthread + 30
Thread 3:
0 libsystem_kernel.dylib 0x05c4bb3e __recvfrom + 10
1 libsystem_sim_c.dylib 0x0589ca9d recv + 54
2 TTWebApp 0x002a19dd recv_uninterrupted + 77 (debug.m:321)
3 TTWebApp 0x002a1c0b monotouch_process_connection + 187 (debug.m:738)
4 TTWebApp 0x002a17e7 monotouch_connect_wifi + 2983 (debug.m:515)
5 TTWebApp 0x002a08ac monotouch_configure_debugging + 2124 (debug.m:269)
6 TTWebApp 0x0029e2ea -[CocoaThreadInitializer entryPoint:] + 122 (shared.m:127)
7 Foundation 0x01aaf597 -[NSThread main] + 76
8 Foundation 0x01aaf4f6 __NSThread__main__ + 1275
9 libsystem_c.dylib 0x05b065b7 _pthread_start + 344
10 libsystem_c.dylib 0x05af0dce thread_start + 34
Thread 4:
0 libsystem_kernel.dylib 0x05c4980a semaphore_wait_trap + 10
1 TTWebApp 0x0027967a mono_sem_wait + 26 (mono-semaphore.c:121)
2 TTWebApp 0x001aa2d7 finalizer_thread + 103 (gc.c:1078)
3 TTWebApp 0x00239ab8 start_wrapper + 376 (threads.c:609)
4 TTWebApp 0x0026dcd7 thread_start_routine + 151 (wthreads.c:294)
5 TTWebApp 0x00279d31 inner_start_thread + 65 (mono-threads-posix.c:49)
6 TTWebApp 0x0029b51d GC_start_routine + 93 (pthread_support.c:1502)
7 libsystem_c.dylib 0x05b065b7 _pthread_start + 344
8 libsystem_c.dylib 0x05af0dce thread_start + 34
Thread 5:
0 libsystem_kernel.dylib 0x05c4bb3e __recvfrom + 10
1 libsystem_sim_c.dylib 0x0589ca9d recv + 54
2 TTWebApp 0x002a19dd recv_uninterrupted + 77 (debug.m:321)
3 TTWebApp 0x002a1ad4 sdb_recv + 52 (debug.m:337)
4 TTWebApp 0x000bc0fb debugger_thread + 22427 (debugger-agent.c:1475)
5 TTWebApp 0x0026dcd7 thread_start_routine + 151 (wthreads.c:294)
6 TTWebApp 0x00279d31 inner_start_thread + 65 (mono-threads-posix.c:49)
7 TTWebApp 0x0029b51d GC_start_routine + 93 (pthread_support.c:1502)
8 libsystem_c.dylib 0x05b065b7 _pthread_start + 344
9 libsystem_c.dylib 0x05af0dce thread_start + 34
Thread 6:
0 libsystem_kernel.dylib 0x05c4bc72 __semwait_signal + 10
1 libsystem_sim_c.dylib 0x0589c98b nanosleep + 219
2 libsystem_sim_c.dylib 0x0589c836 usleep + 60
3 TTWebApp 0x002a62bd monotouch_pump_gc + 61 (monotouch-glue.m:595)
4 libsystem_c.dylib 0x05b065b7 _pthread_start + 344
5 libsystem_c.dylib 0x05af0dce thread_start + 34
Thread 7:
0 libsystem_kernel.dylib 0x05c4c0ee __workq_kernreturn + 10
1 libsystem_c.dylib 0x05b090ac _pthread_workq_return + 45
2 libsystem_c.dylib 0x05b08e79 _pthread_wqthread + 448
3 libsystem_c.dylib 0x05af0daa start_wqthread + 30
Thread 0 crashed with X86 Thread State (32-bit):
eax: 0x00000000 ebx: 0x00000000 ecx: 0x04f3fb00 edx: 0x00000000
edi: 0x04f3fb0e esi: 0x00000000 ebp: 0xbff8ccc8 esp: 0xbff8ccb0
ss: 0x00000023 efl: 0x00000246 eip: 0x04f3fb71 cs: 0x0000001b
ds: 0x00000023 es: 0x00000023 fs: 0x00000000 gs: 0x0000000f
cr2: 0x10165e98
Logical CPU: 0
答案 0 :(得分：3)
我的猜测是你的绑定包含一个采用C＃委托的方法，该委托可以为null。不幸的是，Xamarin.iOS不支持绑定一个可以为null的委托。
您可以尝试一些解决方法：