This application is modifying the autolayout engine from a background thread, which can lead to engi

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.

解决方法：

 __weak typeof(self) weakSelf = self;


                dispatch_async(dispatch_get_main_queue(), ^{
                    
                    [weakSelf.navigationController popViewControllerAnimated:NO];


                    
                });

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