This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes.

 -- ::03.098 天天送[:] This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes.  This will cause an exception in a future release.
  Stack:(
        CoreFoundation                      0x0000000183320f74 <redacted> +
        libobjc.A.dylib                     0x0000000197f13f80 objc_exception_throw +
        CoreFoundation                      0x0000000183320ea4 <redacted> +
        Foundation                          0x000000018433a5d8 <redacted> +
        Foundation                          0x00000001841bca1c <redacted> +
        UIKit                               0x0000000188871a34 <redacted> +
        UIKit                               0x0000000188b798e0 <redacted> +
        UIKit                               0x0000000188870458 <redacted> +
        天天送                           0x0000000100241fc4 -[UIViewController(Toast) hideLoading] + 84
        天天送                           0x00000001001ef4c4 __51-[FudaiPayViewController wxPayWithOrderName:price:]_block_invoke +
       libdispatch.dylib                   0x00000001006a9d70 _dispatch_call_block_and_release +
       libdispatch.dylib                   0x00000001006a9d30 _dispatch_client_callout +
       libdispatch.dylib                   0x00000001006b8f38 _dispatch_root_queue_drain +
       libdispatch.dylib                   0x00000001006b8600 _dispatch_worker_thread3 +
       libsystem_pthread.dylib             0x0000000198921478 _pthread_wqthread +
       libsystem_pthread.dylib             0x0000000198921028 start_wqthread +
 )

调试微信支付时,发现偶尔会有一次崩溃的问题,跟踪,发现调试模式会报这个错误,但是正常模式会直接crash,注意看红色的那行,因为代码是在http的回包block里执行的,应该就是所谓后台执行了,修改掉

        dispatch_async(dispatch_get_main_queue(), ^{
            [weakSelf hideLoading];
            });