动态调整tableviewcell高度

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {  
          
        static NSString *CellIdentifier = @"Cell";  
          
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];  
        if (cell == nil) {  
            cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];  
            UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];  
            label.tag = 1;  
            label.lineBreakMode = UILineBreakModeWordWrap;  
            label.highlightedTextColor = [UIColor whiteColor];  
            label.numberOfLines = 0;  
            label.opaque = NO; // 选中Opaque表示视图后面的任何内容都不应该绘制  
            label.backgroundColor = [UIColor clearColor];  
            [cell.contentView addSubview:label];  
            [label release];  
        }  
          
        UILabel *label = (UILabel *)[cell viewWithTag:1];  
        NSString *text;  
        text = [textArray objectAtIndex:indexPath.row];  
        CGRect cellFrame = [cell frame];  
        cellFrame.origin = CGPointMake(0, 0);  
          
        label.text = text;  
        CGRect rect = CGRectInset(cellFrame, 2, 2);  
        label.frame = rect;  
        [label sizeToFit];  
        if (label.frame.size.height > 46) {  
            cellFrame.size.height = 50 + label.frame.size.height - 46;  
        }  
        else {  
            cellFrame.size.height = 50;  
        }  
        [cell setFrame:cellFrame];  
          
        return cell;  
    }  
      
    - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath  
    {  
        UITableViewCell *cell = [self tableView:tableView cellForRowAtIndexPath:indexPath];  
        //UITableViewCell *cell = [self cellForRowAtIndexPath:indexPath];  
        return cell.frame.size.height;  
    }