APP崩溃提示：This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes.

崩溃输出日志

2017-08-29 14:53:47.332368+0800 HuiDaiKe[2373:1135604] This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes.
 Stack:(
	0   CoreFoundation                      0x0000000188e42ff8 <redacted> + 148
	1   libobjc.A.dylib                     0x00000001878a4538 objc_exception_throw + 56
	2   CoreFoundation                      0x0000000188e42f28 <redacted> + 0
	3   Foundation                          0x0000000189a35378 <redacted> + 128
	4   Foundation                          0x000000018987da38 <redacted> + 36
	5   UIKit                               0x000000018ef703b0 <redacted> + 816
	6   UIKit                               0x000000018ef7c2ac <redacted> + 1740
	7   UIKit                               0x000000018f2a57f0 <redacted> + 88
	8   UIKit                               0x000000018efd9b04 <redacted> + 376
	9   UIKit                               0x000000018f049840 <redacted> + 232
	10  UIKit                               0x000000018f0495b8 <redacted> + 244
	11  UIKit                               0x000000018f0543cc <redacted> + 932
	12  UIKit                               0x000000018f053eec <redacted> + 184
	13  UIKit                               0x000000018f053914 <redacted> + 1728
	14  MJRefresh                           0x00000001013c72bc -[UITableView(MJRefresh) mj_reloadData] + 40
	15  HuiDaiKe                            0x000000010013e440 _TFC8HuiDaiKe40CustomersAddressBookImportViewControllerP33_17FF30CE5B34E964041849EE3753856C13setDataSourcefGSaCS_19cwsAddressBookModel_T_ + 2728
	16  HuiDaiKe                            0x000000010013d968 _TFFC8HuiDaiKe40CustomersAddressBookImportViewControllerP33_17FF30CE5B34E964041849EE3753856C11prepareDataFT_T_U_FTOCS_14cwsAddressBook4typeGSaCS_19cwsAddressBookModel__T_ + 992
	17  HuiDaiKe                            0x00000001001c9cc0 _TFFC8HuiDaiKe14cwsAddressBook3getFT4backFTOS0_4typeGSaCS_19cwsAddressBookModel__T__T_U_FTS1_GSaS2___T_ + 252
	18  HuiDaiKe                            0x00000001001ca5c8 _TFFFC8HuiDaiKe14cwsAddressBookP33_FC9266F7BF731B8D62B76C7FA41D90D413check_iOS_9_0FT4backFTOS0_4typeGSaCS_19cwsAddressBookModel__T__T_U0_FTSbGSqPs5Error___T_U_FTSbGSaS2___T_ + 96
	19  HuiDaiKe                            0x00000001001caa04 _TFC8HuiDaiKe14cwsAddressBookP33_FC9266F7BF731B8D62B76C7FA41D90D411get_iOS_9_0fT4backFTSbGSaCS_19cwsAddressBookModel__T__T_ + 828
	20  HuiDaiKe                            0x00000001001ca544 _TFFC8HuiDaiKe14cwsAddressBookP33_FC9266F7BF731B8D62B76C7FA41D90D413check_iOS_9_0FT4backFTOS0_4typeGSaCS_19cwsAddressBookModel__T__T_U0_FTSbGSqPs5Error___T_ + 220
	21  HuiDaiKe                            0x00000001001ca6bc _TTRXFo_dSboGSqPs5Error____XFdCb_dSbdGSqCSo7NSError___ + 132
	22  ContactsFoundation                  0x0000000191862748 <redacted> + 288
	23  ContactsFoundation                  0x000000019186d680 <redacted> + 600
	24  Contacts                            0x00000001918c814c <redacted> + 72
	25  libdispatch.dylib                   0x0000000187cfa9e0 <redacted> + 24
	26  libdispatch.dylib                   0x0000000187cfa9a0 <redacted> + 16
	27  libdispatch.dylib                   0x0000000187d090d4 <redacted> + 644
	28  libdispatch.dylib                   0x0000000187d0aa50 <redacted> + 540
	29  libdispatch.dylib                   0x0000000187d0a7d0 <redacted> + 124
	30  libsystem_pthread.dylib             0x0000000187f03100 _pthread_wqthread + 1096
	31  libsystem_pthread.dylib             0x0000000187f02cac start_wqthread + 4
)

崩溃原因

在子线程中更新UI导致主线程的视图布局出错

解决方法

把更新UI的操作放在主线程中执行

swift示例

DispatchQueue.main.async {
   self.mainTableview.reloadData()
}