在block回调中要去刷新界面，遇到这样的问题
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.
截图如下，英语比较挫，大概意思就是说需要在主线程中去刷新UI
错误信息
错误代码如下
_coutTimeV.timeOut = ^(){
[weakSelf.coutTimeV endCountDown];
[weakSelf doSomething];
};
修改后
_coutTimeV.timeOut = ^(){
[weakSelf.coutTimeV endCountDown];
//通知主线程去做刷新动作
dispatch_async(dispatch_get_main_queue(), ^{
[weakSelf doSomething];
});
};
小白总结，欢迎打脸指正
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