//行間
let textStyle = NSMutableParagraphStyle()
textStyle.lineSpacing = LINE_H
textStyle.paragraphSpacing = LINE_H // 改行時の行間スペース
// FONT
let _font_en:UIFont = UIFont(name:“HelveticaNeue-Light”, size:18)!;
// set all style attributes
let attributes_en: Dictionary = [NSParagraphStyleAttributeName: textStyle, NSFontAttributeName: _font_en]
let attrText = NSMutableAttributedString(string: tx)
attrText.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSMakeRange(red_from,red_len))
attrText.addAttribute(NSParagraphStyleAttributeName, value:textStyle, range:NSMakeRange(0, tx.characters.count))
txAnswer.attributedText = attrText
txAnswer.font=_font_en;