UILabel行高设置

_contentLabel.frame = CGRectMake(8, 136, SCREEN_WIDTH - 16, 1);
    _contentLabel.numberOfLines = 0;
    _contentLabel.text = [Collect replaceNull:[_contentDic objectForKey:@"description"]];
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]initWithString:_contentLabel.text];;
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    [paragraphStyle setLineSpacing:5];
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, _contentLabel.text.length)];
    
    _contentLabel.attributedText = attributedString;
    [_contentLabel sizeToFit];