iOS-Swift 单位转化

// 米
        let distance = Measurement(value: 2000, unit: UnitLength.meters)
        // 转化为千米
        let kilometers = distance.converted(to: .kilometers)
        // 转化为英里
        let miles = distance.converted(to: .miles)
        
        // 格式化输出，保留两位小数
        let kilometersFormatted = String(format: "%.2f", kilometers.value)
        let milesFormatted = String(format: "%.2f", miles.value)

        print("🐢\(kilometersFormatted) 千米\n🐢\(milesFormatted) 英里")