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

项目中遇到一个跳转问题，延时（等待时间）特别久，并且报下面的的提示警告

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.

问题原因：

问题的原因是因为在子线程中刷新了UI，解决办法是，回到主线程中刷新UI

解决办法：

参考：CocoaChina

   dispatch_async(dispatch_get_main_queue(), ^
            {
                // 更UI

            });

或者

[self performSelectorOnMainThread:<#(nonnull SEL)#> withObject:<#(nullable id)#> waitUntilDone:<#(BOOL)#>]

参见：Stack Overflow

其他类似：

(http://blog.youkuaiyun.com/quanqinyang/article/details/49516593)