block回调中刷新ui，日志提示：
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.
意思是：需要在主线程中去刷新UI
block回调中刷新ui，日志提示：
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.
意思是：需要在主线程中去刷新UI
本文标题：block中刷新UI
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