我以前没有这个问题。一切正常，但最近我的每个视图控制器中的UITextField在我触摸它时崩溃。它会抛出一些异常，例如 -[UITextField window]:发送到已释放实例 0x11843f80 的消息。我已经正确设置了 IBOutlet 和操作，代表 UITextField。直到最近我还没有遇到这个问题，但是随着新视图控制器的添加，我正在使用的所有视图控制器都遇到了这个问题。当我运行 lldb 命令来跟踪应用程序时，跟踪日志显示如下内容，
thread #1: tid = 0x1c03, 0x02fb3dee CoreFoundation`___forwarding___ + 206, stop reason = EXC_BREAKPOINT (code=EXC_I386_BPT, subcode=0x0)
frame #0: 0x02fb3dee CoreFoundation`___forwarding___ + 206
frame #1: 0x02fb3cb2 CoreFoundation`_CF_forwarding_prep_0 + 50
frame #2: 0x00f6c592 UIKit`-[UITextSelectionView textSelectionViewActivated:] + 117
frame #3: 0x0195ea29 Foundation`__57-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_0 + 40
frame #4: 0x03018855 CoreFoundation`___CFXNotificationPost_block_invoke_0 + 85
frame #5: 0x03018778 CoreFoundation`_CFXNotificationPost + 1976
frame #6: 0x018a319a Foundation`-[NSNotificationCenter postNotificationName:object:userInfo:] + 98
frame #7: 0x018afb03 Foundation`-[NSNotificationCenter postNotificationName:object:] + 55
frame #8: 0x00f6bcb3 UIKit`-[UITextSelectionView activate] + 83
frame #9: 0x00d428bb UIKit`-[UIFieldEditor becomeFieldEditorForView:] + 1523
frame #10: 0x00d2ff02 UIKit`-[UITextField _becomeFirstResponder] + 99
frame #11: 0x00d6e093 UIKit`-[UIResponder becomeFirstResponder] + 351
frame #12: 0x00f4d8fb UIKit`-[UITextInteractionAssistant setFirstResponderIfNecessary] + 208
frame #13: 0x00f4f5f8 UIKit`-[UITextInteractionAssistant oneFingerTap:] + 1989
frame #14: 0x00f47e29 UIKit`_UIGestureRecognizerSendActions + 143
frame #15: 0x00f47133 UIKit`-[UIGestureRecognizer _updateGestureWithEvent:] + 379
frame #16: 0x00f483bf UIKit`-[UIGestureRecognizer _delayedUpdateGesture] + 46
frame #17: 0x00f4aa21 UIKit`___UIGestureRecognizerUpdate_block_invoke_0541 + 57
frame #18: 0x00f4a97c UIKit`_UIGestureRecognizerApplyBlocksToArray + 277
frame #19: 0x00f433d7 UIKit`_UIGestureRecognizerUpdate + 1026
frame #20: 0x00ca81a2 UIKit`-[UIWindow _sendGesturesForEvent:] + 1121
frame #21: 0x00ca8532 UIKit`-[UIWindow sendEvent:] + 93
frame #22: 0x00c8edc4 UIKit`-[UIApplication sendEvent:] + 464
frame #23: 0x00c82634 UIKit`_UIApplicationHandleEvent + 8196
frame #24: 0x03451ef5 GraphicsServices`PurpleEventCallback + 1274
frame #25: 0x03021195 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
frame #26: 0x02f85ff2 CoreFoundation`__CFRunLoopDoSource1 + 146
frame #27: 0x02f848da CoreFoundation`__CFRunLoopRun + 2218
frame #28: 0x02f83d84 CoreFoundation`CFRunLoopRunSpecific + 212
frame #29: 0x02f83c9b CoreFoundation`CFRunLoopRunInMode + 123
frame #30: 0x034507d8 GraphicsServices`GSEventRunModal + 190
frame #31: 0x0345088a GraphicsServices`GSEventRun + 103
frame #32: 0x00c80626 UIKit`UIApplicationMain + 1163
frame #33: 0x000a99bd Introdex`main + 141 at main.m:15
frame #34: 0x000029d5 Introdex`start + 53
thread #2: tid = 0x2103, 0x95de79ae libsystem_kernel.dylib`kevent + 10
frame #0: 0x95de79ae libsystem_kernel.dylib`kevent + 10
frame #1: 0x033f6372 libdispatch.dylib`_dispatch_mgr_invoke + 918
frame #2: 0x033f4be1 libdispatch.dylib`_dispatch_mgr_thread + 53
thread #4: tid = 0x2303, 0x95de691a libsystem_kernel.dylib`__psynch_mutexwait + 10
frame #0: 0x95de691a libsystem_kernel.dylib`__psynch_mutexwait + 10
frame #1: 0x969fa13b libsystem_c.dylib`pthread_mutex_lock + 595
frame #2: 0x070e475e WebCore`_WebTryThreadLock(bool) + 46
frame #3: 0x070e4455 WebCore`WebRunLoopLock(__CFRunLoopObserver*, unsigned long, void*) + 37
frame #4: 0x0302199e CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
frame #5: 0x02fb8640 CoreFoundation`__CFRunLoopDoObservers + 384
frame #6: 0x02f84635 CoreFoundation`__CFRunLoopRun + 1541
frame #7: 0x02f83d84 CoreFoundation`CFRunLoopRunSpecific + 212
frame #8: 0x02f83c9b CoreFoundation`CFRunLoopRunInMode + 123
frame #9: 0x070e4420 WebCore`RunWebThread(void*) + 560
frame #10: 0x969f4557 libsystem_c.dylib`_pthread_start + 344
thread #8: tid = 0x2703, 0x95de47d2 libsystem_kernel.dylib`mach_msg_trap + 10
frame #0: 0x95de47d2 libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x95de3cb0 libsystem_kernel.dylib`mach_msg + 68
frame #2: 0x0302110a CoreFoundation`__CFRunLoopServiceMachPort + 186
frame #3: 0x02f845d5 CoreFoundation`__CFRunLoopRun + 1445
frame #4: 0x02f83d84 CoreFoundation`CFRunLoopRunSpecific + 212
frame #5: 0x02f83c9b CoreFoundation`CFRunLoopRunInMode + 123
frame #6: 0x0199ce30 Foundation`+[NSURLConnection(Loader) _resourceLoadLoop:] + 398
frame #7: 0x018ae4d6 Foundation`-[NSThread main] + 76
frame #8: 0x018ae447 Foundation`__NSThread__main__ + 1258
frame #9: 0x969f4557 libsystem_c.dylib`_pthread_start + 344
thread #9: tid = 0x2803, 0x95de6be6 libsystem_kernel.dylib`select$DARWIN_EXTSN + 10
frame #0: 0x95de6be6 libsystem_kernel.dylib`select$DARWIN_EXTSN + 10
frame #1: 0x02fb57cb CoreFoundation`__CFSocketManager + 939
frame #2: 0x969f4557 libsystem_c.dylib`_pthread_start + 344
thread #10: tid = 0x2903, 0x95de47d2 libsystem_kernel.dylib`mach_msg_trap + 10
frame #0: 0x95de47d2 libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x95de3cb0 libsystem_kernel.dylib`mach_msg + 68
frame #2: 0x0302110a CoreFoundation`__CFRunLoopServiceMachPort + 186
frame #3: 0x02f845d5 CoreFoundation`__CFRunLoopRun + 1445
frame #4: 0x02f83d84 CoreFoundation`CFRunLoopRunSpecific + 212
frame #5: 0x02f83c9b CoreFoundation`CFRunLoopRunInMode + 123
frame #6: 0x06df9f50 WebCore`WebCore::runLoaderThread(void*) + 176
frame #7: 0x086ce807 JavaScriptCore`WTF::threadEntryPoint(void*) + 71
frame #8: 0x969f4557 libsystem_c.dylib`_pthread_start + 344
thread #18: tid = 0x3103, 0x95de47d2 libsystem_kernel.dylib`mach_msg_trap + 10
frame #0: 0x95de47d2 libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x95de3cb0 libsystem_kernel.dylib`mach_msg + 68
frame #2: 0x0302110a CoreFoundation`__CFRunLoopServiceMachPort + 186
frame #3: 0x02f845d5 CoreFoundation`__CFRunLoopRun + 1445
frame #4: 0x02f83d84 CoreFoundation`CFRunLoopRunSpecific + 212
frame #5: 0x02f83c9b CoreFoundation`CFRunLoopRunInMode + 123
frame #6: 0x018e240f Foundation`-[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 300
frame #7: 0x018e22d3 Foundation`-[NSRunLoop(NSRunLoop) run] + 76
frame #8: 0x0012853f Introdex`+[AFURLConnectionOperation networkRequestThreadEntryPoint:] + 111 at AFURLConnectionOperation.m:156
frame #9: 0x018ae4d6 Foundation`-[NSThread main] + 76
frame #10: 0x018ae447 Foundation`__NSThread__main__ + 1258
frame #11: 0x969f4557 libsystem_c.dylib`_pthread_start + 344
thread #21: tid = 0x3403, 0x95de70ee libsystem_kernel.dylib`__workq_kernreturn + 10
frame #0: 0x95de70ee libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x969f704c libsystem_c.dylib`_pthread_workq_return + 45
frame #2: 0x969f6e19 libsystem_c.dylib`_pthread_wqthread + 448
我这里有什么问题。请如果有人可以帮助我，我会很高兴。