Question

我有一个UITableView，我从服务器获取数据并在UITableViewCell中显示。但滚动时数据会消失。请帮忙。

这是我的cellForRowAtIndexPath： -

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier=@"CellIdentifier";
    CCCustomCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    //UITableViewCell *cell=[self.tableView cellForRowAtIndexPath:indexPath];

    if (cell==nil) {
        cell=[[CCCustomCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }


    cell.keyText.text=[[[[arraySuper objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] allKeys] objectAtIndex:0];
    cell.objectText.text=[[[[arraySuper objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] allObjects] objectAtIndex:0];

    [cell.objectText addConstraint:[NSLayoutConstraint constraintWithItem:cell.objectText
                                                                attribute:NSLayoutAttributeWidth
                                                                relatedBy:NSLayoutRelationEqual
                                                                   toItem:nil
                                                                attribute:NSLayoutAttributeHeight
                                                               multiplier:1.0
                                                                 constant:(cell.objectText.text.length>0)?50:0]];

    [cell setUserInteractionEnabled:YES];
    tableView.allowsSelection=YES;

      if (indexPath.row==0)
    {
        cell.keyText.textColor=[UIColor colorWithRed:62.0/255.0 green:60.0/255.0 blue:100.0/255.0 alpha:1];
        cell.keyText.font=[UIFont fontWithName:@"Helvetica-Bold" size:15];
        [cell setUserInteractionEnabled:YES];

    }
    else
    {
        cell.keyText.textColor=[UIColor colorWithRed:74.0/255.0 green:144.0/255.0 blue:226.0/255.0 alpha:1];
        cell.keyText.font=[UIFont fontWithName:@"Helvetica" size:13];
        cell.objectText.textColor=[UIColor colorWithRed:62.0/255.0 green:60.0/255.0 blue:100.0/255.0 alpha:1];
        cell.objectText.font=[UIFont fontWithName:@"Helvetica" size:13];
        cell.userInteractionEnabled=YES;

    }

       return cell;
}

Answer 1

你有细胞出队问题....你没有得到适当的细胞高度。按照以下方法分配数据＆amp;获得适当的高度。检查你的牢房有适当的高度

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static YOUR_TABLEVIEW_CELL *sizingCell = nil;
    static NSString *CellIdentifier=@"YOUR_TABLEVIEW_CELL_IDENTIFIER";
    sizingCell =[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (sizingCell==nil)
   {
       sizingCell=[[YOUR_TABLEVIEW_CELL alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
   }
    [self configureFareIssueCell:sizingCell atIndexPath:indexPath];
    return [self calculateHeightForConfiguredSizingCell:sizingCell];
}

//assign all the labels  here
- (void)configureFareIssueCell:(YOUR_TABLEVIEW_CELL* )cell atIndexPath:(NSIndexPath *)indexPath
{
    //e.g 
   cell.lbl.text=@"YOUR_TEXT";
   cell.imageView.image=[UIImage imageNamed:@"NAME_OF_YOUR_IMAGE"];
} 

- (CGFloat)calculateHeightForConfiguredSizingCell:(YOUR_TABLEVIEW_CELL *)sizingCell
{
    CGSize size = [sizingCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
   return size.height + 1.0f; // Add 1.0f for the cell separator height
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *CellIdentifier=@"YOUR_TABLEVIEW_CELL_IDENTIFIER";
  YOUR_TABLEVIEW_CELL   *cell =[tableView dequeueReusableCellWithIdentifier:@"YOUR_TABLEVIEW_CELL_IDENTIFIER"];
if (cell==nil)
{
    cell=[[YOUR_TABLEVIEW_CELL alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
   }
   [self configureFareIssueCell:cell atIndexPath:indexPath];
  return cell;
 }

Answer 2

尝试使用

[tableView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];

而不是

[tableView dequeueReusableCellWithIdentifier:cellIdentifier];

Answer 3

您正在运行时更改约束。

[cell.objectText addConstraint:[NSLayoutConstraint constraintWithItem:cell.objectText
                                                            attribute:NSLayoutAttributeWidth
                                                            relatedBy:NSLayoutRelationEqual
                                                               toItem:nil
                                                            attribute:NSLayoutAttributeHeight
                                                           multiplier:1.0
                                                             constant:(cell.objectText.text.length>0)?50:0]];

而不是这样，只需将自动布局约束表单添加到标签中。在cellForRowAtIndexPath方法中，只需根据您的要求更新约束。

滚动时UITableView数据消失了吗？

3 个答案: