101 lines
2.8 KiB
Swift
101 lines
2.8 KiB
Swift
//
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// Coin.swift
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// Crush
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//
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// Created by Leon on 2025/8/31.
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//
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import Foundation
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/// 专门用于金额管理的结构体（内部存储为美分）
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struct Coin {
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private(set) var cents: Int
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init(cents: Int) {
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self.cents = max(0, cents)
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}
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init(usd: CGFloat) {
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cents = max(0, Int(round(usd * 100.0)))
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}
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init(input: String?) {
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cents = Coin.parseInput(input)
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}
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var dollars: Decimal {
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return Decimal(cents) / 100
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}
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/// 格式化输出，不带货币符号（始终向下截断到 2 位小数）
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var formatted: String {
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let decimal = dollars as NSDecimalNumber
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let behavior = NSDecimalNumberHandler(
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roundingMode: .down, // 向下截断
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scale: 2, // 保留 2 位小数
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raiseOnExactness: false,
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raiseOnOverflow: false,
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raiseOnUnderflow: false,
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raiseOnDivideByZero: false
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)
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let truncated = decimal.rounding(accordingToBehavior: behavior)
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let formatter = NumberFormatter()
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formatter.numberStyle = .decimal
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formatter.minimumFractionDigits = 0
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formatter.maximumFractionDigits = 2
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formatter.usesGroupingSeparator = false
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return formatter.string(from: truncated) ?? "0"
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}
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var thousandthsFormatted: String {
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let decimal = dollars as NSDecimalNumber
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let behavior = NSDecimalNumberHandler(
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roundingMode: .down, // 向下截断
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scale: 2, // 保留 2 位小数
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raiseOnExactness: false,
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raiseOnOverflow: false,
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raiseOnUnderflow: false,
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raiseOnDivideByZero: false
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)
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let truncated = decimal.rounding(accordingToBehavior: behavior)
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let formatter = NumberFormatter()
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formatter.numberStyle = .decimal
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formatter.minimumFractionDigits = 0
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formatter.maximumFractionDigits = 2
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formatter.usesGroupingSeparator = true // 启用千分位分隔符
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return formatter.string(from: truncated) ?? "0"
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}
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private static func parseInput(_ text: String?) -> Int {
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guard let text = text, !text.isEmpty else { return 0 }
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let formatter = NumberFormatter()
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formatter.numberStyle = .decimal
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formatter.locale = Locale(identifier: "en_US")
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if let number = formatter.number(from: text) {
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let decimal = Decimal(number.doubleValue)
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return (decimal * 100 as NSDecimalNumber).intValue
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}
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return 0
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}
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/*
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let m1 = Money(cents: 1234)
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print(m1.formatted) // 12.34
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let m2 = Money(cents: 1200)
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print(m2.formatted) // 12
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let m3 = Money(cents: 1250)
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print(m3.formatted) // 12.5
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let m4 = Money(cents: 10000)
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print(m4.formatted) // 100
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*/
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}
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