Question

嗨，在我的项目中，我需要从json中提取数据并插入tableview.i创建了两个单元格，但即使在正确的插座连接后它也不会出现。我不知道我做了什么错误。我的tableview和单元格不可见请检查我的编码，下面也有json电话。

-(void)WebServiceTopic{

    [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    AFHTTPRequestOperationManager *TopicManager=[AFHTTPRequestOperationManager manager];
    AFJSONRequestSerializer*serializer=[AFJSONRequestSerializer serializer];
    [serializer setValue:@"application/json" forHTTPHeaderField:@"Content"];
    [serializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    TopicManager.requestSerializer=serializer;

    NSString *Postlink = [NSString stringWithFormat:@"%@Discussions/%@/?categoryid=14",PUBLICURL, [[NSUserDefaults standardUserDefaults]valueForKey:@"USERID"]];

    [TopicManager GET:Postlink parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject){

        NSLog(@"JSON:%@", responseObject);
        NSMutableDictionary *userDict=(NSMutableDictionary *)responseObject;
        TopicArray = (NSMutableArray*)userDict;
        [TopicTable reloadData];

    }failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        NSLog(@"the failure is %@", error);
        [MBProgressHUD hideHUDForView:self.view animated:YES];
    }];
}

#pragma mark -
#pragma mark UITableView Datasource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)sectionIndex
{
    if (TopicArray.count==0) {
        return TopicArray.count;
    }
    return TopicArray.count;
}



-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    if (indexPath.row==0)
    {
        static NSString *CellIdentifier1 = @"Cell";
        DiscussTopicCell *cell = (DiscussTopicCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier1];
        if (TopicArray.count>0) {
            NSDictionary *ResDiction = [TopicArray objectAtIndex:indexPath.row];
                    cell.ActTitle.text = [ResDiction objectForKey:@"Title"];
                    cell.Name.text=[ResDiction objectForKey:@"CreateUserName"];
                    cell.Comment.text=[ResDiction objectForKey:@"CommentCount"];
                    cell.Notes.text=[ResDiction objectForKey:@"Content"];
                    cell.Category.text=[ResDiction objectForKey:@"Category"];
                    cell.Time.text= [ResDiction objectForKey:@"CreateDate"];


            UIView * additionalSeparator = [[UIView alloc] initWithFrame:CGRectMake(0,cell.frame.size.height-3,cell.frame.size.width,3)];
            additionalSeparator.backgroundColor = [UIColor grayColor];
            [cell addSubview:additionalSeparator];
        }

        return cell;
    }
    else
    {
        static NSString *CellIdentifier2 = @"Cell2";
        DiscussTopicCell *cell = (DiscussTopicCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier2];

        NSDictionary *ResDiction = [TopicArray objectAtIndex:indexPath.row];
        cell.ActTitle.text = [ResDiction objectForKey:@"Title"];
        cell.Name.text=[ResDiction objectForKey:@"CreateUserName"];
        cell.Comment.text=[ResDiction objectForKey:@"CommentCount"];
        cell.Notes.text=[ResDiction objectForKey:@"Content"];
        cell.Category.text=[ResDiction objectForKey:@"Category"];
        cell.Time.text= [ResDiction objectForKey:@"CreateDate"];

        UIView * additionalSeparator = [[UIView alloc] initWithFrame:CGRectMake(0,cell.frame.size.height-3,cell.frame.size.width,3)];
        additionalSeparator.backgroundColor = [UIColor grayColor];
        [cell addSubview:additionalSeparator];

        return cell;

    }

}

Answer 1

您必须在从服务器提取数据时重新加载tableview，然后只显示tableview上的一些数据。请重新加载tableview。

参考示例代码

 cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
          cell.Language_label.text=[[lang_array objectAtIndex:indexPath.row] objectForKey:@"lang_desc"];

          if (indexPath.row == color_tag)
          {
                cell.Language_label.backgroundColor=[self colorWithHexString:@"FFCA13"];
          }
          else
          {
                 cell.Language_label.backgroundColor=[UIColor whiteColor];
          }
          return cell;
}

Answer 2

您需要创建单元格。如果没有已创建且可供使用的单元格，则可重复使用的单元格将返回nil。

if(!cell) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
}

UITableView Cell不可见

2 个答案: