ios - NSAttributedString：如何在另一个 NSAttributedString 中创建多行

Question

我正在尝试在另一个文本中创建一个多行单独文本以实现以下文本样式。

我已经尝试了下面的代码来产生目标，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，下面的代码会生成完全相同的结果：

    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
    }