NSAttributedString：如何在另一个NSAttributedString中制作多行

Question

我正在尝试在另一文本中创建多行分隔文本，以实现以下文本样式。

我已经尝试了下面的代码来实现目标，但是代码的第三部分正在创建一个问题（中等字体）

    private func createLimitedDetailText() -> NSAttributedString {
        let totalText = "Attension, only\n 6 spaces\n left!"
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.alignment = .center

        let attributedString = NSMutableAttributedString(string: totalText, attributes: [
            .font: FontFamily.OpenSans.light.font(size: 29.0),
            .foregroundColor: UIColor.white,
            ])

        let bigText = attributedString.addAttribute(.font, value: FontFamily.OpenSans.extrabold.font(size: 70), range: NSRange(location: 17, length: 1))
        let medium = attributedString.addAttribute(.font, value: FontFamily.OpenSans.semibold.font(size: 29), range: NSRange(location: 18, length: 14))

        let textRange = NSRange(location: 0, length: attributedString.length)
        attributedString.addAttribute(NSAttributedString.Key.paragraphStyle, value: paragraphStyle, range: textRange)

        return attributedString
    }

Answer 1

如果有人想知道答案，下面的代码将产生完全相同的结果：

    private func createLimitedDetailText() -> NSAttributedString {
        let totalText = "Attension, only\n 6"
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineHeightMultiple = 0.90
        paragraphStyle.alignment = .center

        let attributedString = NSMutableAttributedString(string: totalText, attributes: [
            .font: FontFamily.OpenSans.light.font(size: 29.0),
            .foregroundColor: UIColor.white,
            NSAttributedString.Key.paragraphStyle: paragraphStyle
            ])

        attributedString.addAttribute(.font, value: FontFamily.OpenSans.extrabold.font(size: 70), range: NSRange(location: 17, length: 1))

        let paragraphStyle2 = NSMutableParagraphStyle()
        paragraphStyle2.lineHeightMultiple = 0.30
        paragraphStyle2.alignment = .center

        let attributedString2 = NSMutableAttributedString(string: "    spaces\n     left!", attributes: [
            .font: FontFamily.OpenSans.semibold.font(size: 29.0),
            .foregroundColor: UIColor.white,
            .baselineOffset: 35,
            .paragraphStyle: paragraphStyle2
            ])
        attributedString.append(attributedString2)

        return attributedString
    }