tabelview刷新不能及时问题

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线程：This application is modifying the autolayout engin from a background thread

    This application is modifying the autolayout engin from a background thread,which can lead to engine corruption and weird crashes,This will cause an exception in a future rellease   
    避开了主线开辟了一个线程去读取数据，拿到数据后直接去更新数据，而不是代码回到主线程中去更新数据

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在处理数据的地方需要调用主线程
dispatch_async(dispatch_get_main_queue(), ^{
});