如何修改字符串中逗号后内容的字体大小为原字体的一半

算力阿峰

2026-7-12

金额字符串小数部分半号字体实现方案

针对以逗号分隔整数与小数位的金额字符串，我们可以通过富文本属性将小数部分的字体大小设置为其余部分的一半，以下是Swift的具体实现代码：

private func getText(text: String, size: CGFloat) -> NSAttributedString {
    let attributedString = NSMutableAttributedString(
        string: text,
        attributes: [
            .font: UIFont.themeFont(ofSize: size, weight: .medium)
        ]
    )
    
    if let commaRange = text.range(of: ",") {
        let startIndex = text.index(commaRange.upperBound, offsetBy: 1)
        let substring = text[startIndex...]
        
        attributedString.addAttributes(
            [
                .font: UIFont.themeFont(ofSize: size / 2, weight: .medium)
            ],
            range: NSRange(location: text.distance(from: text.startIndex, to: startIndex), length: substring.count)
        )
    }
    
    return attributedString
}