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我正在实现聊天应用程序，我想更改聊天应用程序中表格视图单元格的宽度，以便发送者可以看到他的消息左对齐，接收者可以看到他的消息右对齐。

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)
{
    self.bubbleImage = [[UIImageView alloc] init];
    self.bubbleImage.frame = CGRectMake(0,22,250,66);
    self.bubbleImage.image = [[UIImage imageNamed:@"bubbleMine.png"] stretchableImageWithLeftCapWidth:21 topCapHeight:14];

    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 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];
UIFont *cellFont = [UIFont fontWithName:FONT_NAME size:FONT_SIZE];
CGSize constraintSize = CGSizeMake(225.0f, MAXFLOAT);
CGSize labelSize = [cellText sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping];
return labelSize.height + 40;
}
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1 回答 1

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保留一些可以帮助您确定用户的内容，以便您可以在单元格中左右对齐之间切换。使用该信息，您可以相应地放置图像（左右对齐）。您不必调整单元格的宽度，而是必须处理文本大小以及带有聊天的特定单元格的行高。

于 2013-05-30T10:12:48.093 回答