计算次数，有点 死循环的感觉，

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

{

   return [[[self heightArray]objectAtIndex:indexPath.row]floatValue];／／几百个 heightArray,

}

 

-(NSArray *)heightArray

{

    NSMutableArray *arr = [[NSMutableArrayalloc] init];

    for (MessageDetailInfo *info inself.dataArray) {

        CGSize contentSize = [info.contentsizeWithFont:[UIFontsystemFontOfSize:13.0f] constrainedToSize:CGSizeMake(labelWidth, MAXFLOAT)];

        NSString *heightString = [NSString stringWithFormat:@"%.0f",contentSize.height + 120];

        [arr addObject:heightString];

    }

    return arr;

}