线程问题：This application is modifying the autolayout engine from a background thread after the engine w

线程问题：This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes.
 

（大致意思是我避开了主线开辟了一个线程去处理数据，拿到数据后我直接去更新数据，而不是代码回到主线程中去更新数据） 

解决：刷新UI必须回到主线程