UILabel 的行间距

// 调整行间距
        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:textStr];
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setLineSpacing:6];
        [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [textStr length])];
        openMicPrivilegeTipsLabel.attributedText = attributedString;