刷新控件
__weak typeof(self) weakSelf = self;
LyRefreshView *heard = [LyRefreshView heardRefreshWithBlock:^{
__strong typeof(weakSelf) strongSelf = weakSelf;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[strongSelf.tableView.ly_heard endRefreshing];
});
}];
self.tableView.ly_heard = heard;
heard.autoRefresh = YES;