iOS UITableViewCell自适应高度

 self.lalName=[[UILabel alloc] initWithFrame:CGRectMake(71, 5, 250, 40)];
    [self addSubview:self.lalName];

//给用户介绍赋值并且实现自动换行
-(void)setIntroductionText:(NSString*)text{
    //获得当前cell的高度
    CGRect frame=[self frame];
    //文本赋值
    self.lalName.text=text;
    CGSize size=CGSizeMake(300, 1000);
    //设置label的最大行数
    self.lalName.numberOfLines=10;
    CGSize labelSize=[self.lalName.text sizeWithFont:self.lalName.font constrainedToSize:size lineBreakMode:NSLineBreakByClipping];
    self.lalName.frame=CGRectMake(self.lalName.frame.origin.x, self.lalName.frame.origin.y, labelSize.width, labelSize.height) ;
    
    //计算出自适应的高度
    frame.size.height=labelSize.height+20;
    self.frame =frame;
    
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *acell=@"acell";
    TextKitTableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:acell];
    if (!cell) {
        cell=[[[NSBundle mainBundle] loadNibNamed:@"TextKitTableViewCell" owner:self options:nil]lastObject];
    }
    
 
    [cell setIntroductionText:@"where are you? where are you? where are you? where are you? where are you? where are you? where are you? where are you? where are you? where are you?where are you? where are you? where are you? where are you? where are you? where are you? where are you? where are you? where are you? where are you?"];
    return cell;
    
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    UITableViewCell *cell=[self tableView:self.tableViewTextKit cellForRowAtIndexPath:indexPath];
    NSLog(@"height===%f",cell.frame.size.height);
    return cell.frame.size.height;
}