ios11适配

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1.iOS11下必须加那两个方法，否则不走表头表尾高度设置方法的

-(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section{
    UIView *footView = [[UIView alloc]init];
    return footView;
}
-(UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *headerView = [[UIView alloc]init];
    return headerView;
}

2.ios11不走self.automaticallyAdjustsScrollViewInsets = NO;

需要设置：

if (@available(iOS 11.0, *)) {
        tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    } else {
        // Fallback on earlier versions
    }