获得富文本以后的文字高度

代码：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [self addView];

}
#pragma -mark -functions
//初始化界面
-(void)addView
{
    //文字
    UILabel *dataLabel = [[UILabel alloc] init];
    dataLabel.backgroundColor = [UIColor orangeColor];
    dataLabel.text = @"我是文字文字文字文字文字文字文字文字文字文字文字111111111111111111111111111111111112222222222222333333333";
    dataLabel.textColor = [UIColor redColor];
    dataLabel.font = [UIFont fontWithName:@"Arial" size:14];
    dataLabel.numberOfLines = 0;
    [self.view addSubview:dataLabel];

    //富文本设置文字行间距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    paragraphStyle.lineSpacing = 4;

    NSDictionary *attributes = @{ NSFontAttributeName:[UIFont systemFontOfSize:14], NSParagraphStyleAttributeName:paragraphStyle};
    dataLabel.attributedText = [[NSAttributedString alloc]initWithString:dataLabel.text attributes:attributes];

    //获取设置文本间距以后的高度
    CGRect fram = [dataLabel.attributedText boundingRectWithSize:CGSizeMake(210, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin context:nil];

    dataLabel.frame=CGRectMake(50, 100, 210, fram.size.height);

}