仅在模拟器上才发生iOS应用崩溃[UIKeyboardTaskQueue waitUntilAllTask​​sAreFinished]

Question

尝试登录时，我们面临着未知的崩溃：

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UIKeyboardTaskQueue waitUntilAllTasksAreFinished] may only be called from the main thread.'

仅当使用键盘输入文本字段信息时，崩溃才会发生在模拟器上。 当使用“切换软件键盘”时，一切都很好...

我们检查了每个主题，但找不到答案。

如果您有任何想法，请先谢谢。

PS：这是完整的日志

2018-05-29 17:50:22.769863+0200 Katch[89138:772858] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UIKeyboardTaskQueue waitUntilAllTasksAreFinished] may only be called from the main thread.'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010972612b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x0000000108321f41 objc_exception_throw + 48
    2   CoreFoundation                      0x000000010972b2f2 +[NSException raise:format:arguments:] + 98
    3   Foundation                          0x0000000107dc2d69 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 193
    4   UIKit                               0x000000010bc7005d -[UIKeyboardTaskQueue waitUntilAllTasksAreFinished] + 380
    5   UIKit                               0x000000010b1dfd98 -[UIKeyboardImpl setDelegate:force:] + 1596
    6   UIKit                               0x000000010b6cebcf -[UIPeripheralHost(UIKitInternal) _reloadInputViewsForResponder:] + 1271
    7   UIKit                               0x000000010b6d8480 -[UIPeripheralHost(UIKitInternal) _preserveInputViewsWithId:animated:reset:] + 498
    8   UIKit                               0x000000010b098130 -[UIViewController _presentViewController:modalSourceViewController:presentationController:animationController:interactionController:completion:] + 1233
    9   UIKit                               0x000000010b099e94 -[UIViewController _presentViewController:withAnimationController:completion:] + 4621
    10  UIKit                               0x000000010b09c9a9 __63-[UIViewController _presentViewController:animated:completion:]_block_invoke + 99
    11  UIKit                               0x000000010b09d079 -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 532
    12  UIKit                               0x000000010b09c908 -[UIViewController _presentViewController:animated:completion:] + 181
    13  UIKit                               0x000000010b09cc67 -[UIViewController presentViewController:animated:completion:] + 159
    14  UIKit                               0x000000010b0a1fea -[UIViewController _showViewController:withAction:sender:] + 274
    15  UIKit                               0x000000010b0a204e -[UIViewController showViewController:sender:] + 57
    16  UIKit                               0x000000010b0d0f2c -[UINavigationController showViewController:sender:] + 215
    17  UIKit                               0x000000010b0a1f4e -[UIViewController _showViewController:withAction:sender:] + 118
    18  UIKit                               0x000000010b0a204e -[UIViewController showViewController:sender:] + 57
    19  Katch                               0x00000001068ae882 _T05Katch29SignUpUserInfosViewControllerC6signInyyFySb_SStcfU_Tf4ngXg_n + 530
    20  Katch                               0x00000001068af157 _T05Katch29SignUpUserInfosViewControllerC04signC0yyFySb_SStcfU_TATm + 71
    21  Katch                               0x00000001068af100 _T05Katch29SignUpUserInfosViewControllerC6signInyyFySb_SStcfU_TA + 16
    22  Katch                               0x00000001068ecc46 _T05Katch12KMSignUpDataC6signInySS4mail_SS8passwordySb_SStc10completiontFyyXlSg_SSSgtcfU_Tf4gdg_n + 2006
    23  Katch                               0x00000001068edb31 _T05Katch12KMSignUpDataC04signC0yySb_SStc10completion_tFyyXlSg_SSSgtcfU_TATm + 65
    24  Katch                               0x00000001068edae0 _T05Katch12KMSignUpDataC6signInySS4mail_SS8passwordySb_SStc10completiontFyyXlSg_SSSgtcfU_TA + 16
    25  Katch                               0x000000010688be27
_T05Katch16KMServiceManagerC7request9Alamofire11DataRequestCAC0B4TypeO3for_s10DictionaryVySSypGSg10parametersALyS2SGSg7headersyyXlSg_SSSgtc10completiontFyAE0F8ResponseVyypGcfU_ + 4743
    26  Katch                               0x000000010688ceeb _T05Katch16KMServiceManagerC7request9Alamofire11DataRequestCAC0B4TypeO3for_s10DictionaryVySSypGSg10parametersALyS2SGSg7headersyyXlSg_SSSgtc10completiontFyAE0F8ResponseVyypGcfU_TA + 59
    27  Alamofire                           0x0000000106f93b3e _T09Alamofire11DataRequestC8responseACXDSo13DispatchQueueCSg5queue_x0D10SerializeryAA0B8ResponseVy16SerializedObjectQzGc17completionHandlertAA0biH8ProtocolRzlFyycfU_yycfU_AA0biH0VyypG_Tg5 + 334
    28  Alamofire                           0x0000000106f9e1ee _T09Alamofire15DownloadRequestC8responseACXDSo13DispatchQueueCSg5queue_x0D10SerializeryAA0B8ResponseVy16SerializedObjectQzGc17completionHandlertAA0biH8ProtocolRzlFyycfU_yycfU_AA0biH0VyypG_Tg5TATm + 62
    29  Alamofire                           0x0000000106f9ddf0 _T09Alamofire11DataRequestC8responseACXDSo13DispatchQueueCSg5queue_x0D10SerializeryAA0B8ResponseVy16SerializedObjectQzGc17completionHandlertAA0biH8ProtocolRzlFyycfU_yycfU_AA0biH0VyypG_Tg5TA + 16
    30  Alamofire                           0x0000000106f722f0 _T0Ix_IyB_TR + 32
    31  libdispatch.dylib                   0x000000010dccb2f7 _dispatch_call_block_and_release + 12
    32  libdispatch.dylib                   0x000000010dccc33d _dispatch_client_callout + 8
    33  libdispatch.dylib                   0x000000010dcd2754 _dispatch_continuation_pop + 967
    34  libdispatch.dylib                   0x000000010dcd0b85 _dispatch_async_redirect_invoke + 780
    35  libdispatch.dylib                   0x000000010dcd8102 _dispatch_root_queue_drain + 772
    36  libdispatch.dylib                   0x000000010dcd7da0 _dispatch_worker_thread3 + 132
    37  libsystem_pthread.dylib             0x000000010e2645a2 _pthread_wqthread + 1299
    38  libsystem_pthread.dylib             0x000000010e26407d start_wqthread + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

Answer 1

您似乎在后台线程中触发UI调用（呈现视图控制器等）。 UI调用应在主线程上完成。

AlamoFire调用完成后，您可以将调用包装到SignUpUserViewController中：

DispatchQueue.main.async(execute: {
  //launch view here
})

请注意，我完全基于调用堆栈进行一些猜测。 如果这不正确，则触发该错误的某些代码可能会有所帮助。