使用UIRefreshControl刷新UITableView

Question

我在UIRefreshControl中插入UIRefreshControl ，当我下拉表格视图时调用的是cellForRowAtIndex方法，但是我的数组列表中没有元素，为什么要调用它？ viewDidLoad方法中的UIRefreshControl代码：

refreshControl = [[UIRefreshControl alloc]init];
[self.tblView addSubview:refreshControl];
[refreshControl addTarget:self action:@selector(refreshTablee) forControlEvents:UIControlEventValueChanged];

refreshTablee的代码是：

#pragma mark:refresh table
- (void)refreshTablee {
    //TODO: refresh your data
    [refreshControl endRefreshing];
    page=1;
    slot = 10;
    HUD = [MBProgressHUD showHUDAddedTo:self.view animated:true];
    [apiObj getAskQuestion:@{@"user_id":usr.usrid,@"owner_id":usr.owner_id ,@"page":[NSString stringWithFormat:@"%d",page]}];
    [backupArr removeAllObjects];
    [questionList removeAllObjects];
}

表方法是：

#pragma mark:table view delegate datasource
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return questionList.count;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

   //code for returning cell
    return cell;
}


-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
    if ((int)indexPath.row == (slot-2)) {
        page = page+1;
        slot = slot+10;

        HUD = [MBProgressHUD showHUDAddedTo:self.view animated:true];

       [apiObj getAskQuestion:@{@"user_id":usr.usrid,@"owner_id":usr.owner_id ,@"page":[NSString stringWithFormat:@"%d",page]}];
    }
}

Answer 1

按照@dreamBegin的建议，我在refreshTablee方法及其工作中重新加载了表。 感谢您的回复@dreamBegin

#pragma mark:refresh table
- (void)refreshTablee {
    //TODO: refresh your data
    [refreshControl endRefreshing];
    page=1;
    slot = 10;
    HUD = [MBProgressHUD showHUDAddedTo:self.view animated:true];
   [apiObj getAskQuestion:@{@"user_id":usr.usrid,@"owner_id":usr.owner_id ,@"page":[NSString stringWithFormat:@"%d",page]}];
    [backupArr removeAllObjects];
    [questionList removeAllObjects];
    [self.tblView reloadData];
}