［转］让UITableView中的单元格根据内容的多少自动调整高度

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
{
    NSString *text = [items objectAtIndex:[indexPath row]];
    
   //下句中(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2)  表示显示内容的label的长度 ，20000.0f 表示允许label的最大高度

    CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f);
    CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];
    
    CGFloat height = MAX(size.height, 44.0f);
    
    return height + (CELL_CONTENT_MARGIN * 2);
}

- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell;
    UILabel *label = nil;
    
    cell = [tv dequeueReusableCellWithIdentifier:@"Cell"];
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"Cell"] autorelease];
        
        label = [[UILabel alloc] initWithFrame:CGRectZero];
        [label setLineBreakMode:UILineBreakModeWordWrap];
        [label setMinimumFontSize:FONT_SIZE];
        [label setNumberOfLines:0];
        [label setFont:[UIFont systemFontOfSize:FONT_SIZE]];
        [label setTag:1];
        
        [[label layer] setBorderWidth:2.0f];
        
        [[cell contentView] addSubview:label];
        
    }
    NSString *text = [items objectAtIndex:[indexPath row]];
    
    CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f);
    
    CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];
    
    if (!label)
        label = (UILabel*)[cell viewWithTag:1];
    
    [label setText:text];
    [label setFrame:CGRectMake(CELL_CONTENT_MARGIN, CELL_CONTENT_MARGIN, CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), MAX(size.height, 44.0f))];
    
    return cell;

}

源代码下载：http://download.csdn.net/detail/ygm900/5404317

以上源代码可在模拟器模式下正常运行，已测试。