[iOS] UILabel調整行間距方法

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:_detailLabel.text];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:8];
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [_detailLabel.text length])];
    _detailLabel.attributedText = attributedString;
    [_detailLabel sizeToFit];