设置textview lable的行间距

NSMutableParagraphStyle*paragraphStyle = [[NSMutableParagraphStylealloc]init];

   paragraphStyle.lineSpacing= 4;

    

   NSDictionary*attributes = @{ NSFontAttributeName:[UIFontsystemFontOfSize:14],NSParagraphStyleAttributeName:paragraphStyle};

   label.attributedText= [[NSAttributedStringalloc]initWithString:label.textattributes:attributes];