警告提示: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.

错误原因:在回调函数中或者后台线程中更新了UI界面,而UI界面必须是在主界面中才能进行修改

解决办法:

dispatch_async(dispatch_get_main_queue(), ^{

<your code>

});

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