Question

如果我在表格单元格中写两行以上，我想使imageview成为可伸缩的。但是我遇到了如下问题：

我的细胞代码如下：

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   chatCell *cell = (chatCell *)[tableView dequeueReusableCellWithIdentifier:CHAT_CELL_IDENTIFIER];
   NSUInteger row = indexPath.row;
   if (row < chatData.count)
   {

    NSString *chatText = [[chatData objectAtIndex:row] objectForKey:TEXT];
    cell.textLabel.lineBreakMode = NSLineBreakByWordWrapping;
    UIFont *font = [UIFont systemFontOfSize:14];
    CGSize size = [chatText sizeWithFont:font constrainedToSize:CGSizeMake(150.0f, 1000.0f) lineBreakMode:NSLineBreakByCharWrapping];
    cell.textString.frame = CGRectMake(75, 18, size.width +20, size.height + 20); // set text frame
    cell.textString.font = [UIFont fontWithName:FONT_NAME size:FONT_SIZE];        // set text font
    cell.textString.text = chatText;                                              // set text
    [cell.textString sizeToFit];

    NSDate *theDate = [[chatData objectAtIndex:row] objectForKey:DATE];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:DATE_FORMAT];
    NSString *timeString = [formatter stringFromDate:theDate];
    cell.timeLabel.text = timeString;                                       // set timeLabel to display date and time
    cell.userLabel.text = [[chatData objectAtIndex:row] objectForKey:NAME]; // set userLabel to display userName

    self.bubbleImage = [[UIImageView alloc] init];
    self.bubbleImage.frame = CGRectMake(0,22,250,CGRectGetMaxY(cell.textString.frame)+10.0);
    self.bubbleImage.image = [[UIImage imageNamed:@"bubbleMine.png"] stretchableImageWithLeftCapWidth:21 topCapHeight:14];

    [self.bubbleImage addSubview:cell.userLabel];
    [self.bubbleImage addSubview:cell.timeLabel];
    [self.bubbleImage addSubview:cell.textString];

    [cell addSubview:self.bubbleImage];
        }
return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
 NSString *cellText = [[chatData objectAtIndex:indexPath.row] objectForKey:TEXT];
//calculate height for each row based on the textString
UIFont *font = [UIFont fontWithName:FONT_NAME size:FONT_SIZE];
CGSize size1 = [cellText sizeWithFont:font constrainedToSize:CGSizeMake(150.0f, 1000.0f) lineBreakMode:NSLineBreakByCharWrapping];
return size1.height+100.0; //or whatever padding value you need
}

这有问题：

CGRectGetMaxY(cell.textString.frame)+10.0

排在下面：

self.bubbleImage.frame = CGRectMake(0,22,250,CGRectGetMaxY(cell.textString.frame)+10.0);

因为我获得了单个细胞的2/3图像。

Answer 1

问题在于，每次重复使用时，都会不断向细胞添加新的子视图。而不只是做：

[cell addSubview:self.bubbleImage];

尝试：

[cell.contentView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
[cell.contentView addSubview:self.bubbleImage];

更好的选择是在创建单元格时为UIImageView创建单个bubbleImage并设置其自动调整遮罩。然后，当调整单元格大小时，图像将自动适当更改...

将imageview添加为uitableviewcell的子视图时，将imageview设置为可伸缩时出错

1 个答案: