给scrollview添加上下拉刷新，只需简单的两三行代码即可

- (void)addRefreshView {
    
    __weak __typeof(self)weakSelf = self;
    
    //下拉刷新
    headerView = [mTableView addHeaderWithRefreshHandler:^(FCXRefreshBaseView *refreshView) {
        [weakSelf refreshAction];
    }];
    
    //上拉加载更多
    footerView = [mTableView addFooterWithRefreshHandler:^(FCXRefreshBaseView *refreshView) {
        [weakSelf loadMoreAction];
    }];
    
    //自动刷新
    footerView.autoLoadMore = self.autoLoadMore;
}