今天在写登录界面的时候 发生崩溃.
说明如下
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
后来我就将代码放入主线程后正常.
参考 http://www.cocoachina.com/bbs/read.php?tid-324258.html
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