如何设置UILabel中的字体的间距

      cell.teacherDescriptionLabel.text = content;
             cell.teacherDescriptionLabel.textAlignment = NSTextAlignmentJustified;
             NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:content];
             NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
             paragraphStyle.alignment = NSTextAlignmentJustified;//设置对齐方式
             paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
             [paragraphStyle setLineSpacing:];//调整行间距

             [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(, [content length])];
             cell.teacherDescriptionLabel.attributedText = attributedString;

我们假定cell中的一个UILabel需要把间距设置大一点 ，只需要把普通的文本转成带有格式的文本就行了