iOS 阿拉伯数字转汉字数字（常用数字格式化）

image

1. Objective-C:

    double testNum = 367.12459;
    
    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
    /// 拼写输出中文
    formatter.numberStyle = kCFNumberFormatterSpellOutStyle;
    /// 如果不设置locle 跟随系统语言
    formatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
    NSString *spellOutStr = [formatter stringFromNumber:[NSNumber numberWithDouble: testNum]];
    NSLog(@"SpellOut 中文: %@", spellOutStr);
    
    /// 拼写输出英文
    formatter.numberStyle = kCFNumberFormatterSpellOutStyle;
    /// 如果不设置locle 跟随系统语言
    formatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
    NSString *spellOutStrEn = [formatter stringFromNumber:[NSNumber numberWithDouble: testNum]];
    NSLog(@"SpellOut 英文: %@", spellOutStrEn);

2. Swift5

    let number = 367.12459
    let numberFormatter = NumberFormatter()
    /// 如果不设置locle 跟随系统语言
    numberFormatter.locale = Locale(identifier: "zh_CN")
    numberFormatter.numberStyle = NumberFormatter.Style.spellOut
    let numberStr = numberFormatter.string(from: NSNumber(value: number)) ?? ""
    print(numberStr)

枚举类型说明

• None：无类型 输出：
• Decimal：取小数点后三位 输出：367.125
• Currency：格式化为货币（保留两位小数），货币符号跟随Locale 输出：$367.12 （或 ￥367.12）
• Percent：格式化为百分数（保留两位小数） 输出：36,712%
• Scientific：格式化为科学计数法 输出：3.6712459E2
• SpellOut：格式化拼写格式 ，中英文跟随Locale 输出：三百六十七点一二四五九 （或three hundred sixty-seven point one two four five nine）
• Ordinal：格式化为序号（保留整数），中英文跟随Locale 输出：368th （或 第367）
• CurrencyISOCode：格式化为货币标准码 输出：USD 367.12
• CurrencyPlural：格式化为货币 输出：367.12 US dollars （或 367.12 人民币）**
• CurrencyAccounting：格式化为货币会计 输出：$367.12

CFNumberFormatterStyle

1. Objective-C:

typedef CF_ENUM(CFIndex, CFNumberFormatterStyle) {  // number format styles
    kCFNumberFormatterNoStyle = 0,
    kCFNumberFormatterDecimalStyle = 1,
    kCFNumberFormatterCurrencyStyle = 2,
    kCFNumberFormatterPercentStyle = 3,
    kCFNumberFormatterScientificStyle = 4,
    kCFNumberFormatterSpellOutStyle = 5,
    kCFNumberFormatterOrdinalStyle API_AVAILABLE(macos(10.11), ios(9.0), watchos(2.0), tvos(9.0)) = 6,
    kCFNumberFormatterCurrencyISOCodeStyle API_AVAILABLE(macos(10.11), ios(9.0), watchos(2.0), tvos(9.0)) = 8,
    kCFNumberFormatterCurrencyPluralStyle API_AVAILABLE(macos(10.11), ios(9.0), watchos(2.0), tvos(9.0)) = 9,
    kCFNumberFormatterCurrencyAccountingStyle API_AVAILABLE(macos(10.11), ios(9.0), watchos(2.0), tvos(9.0)) = 10,
};

2. Swift

extension NumberFormatter {
    public enum Style : UInt {
        case none
        case decimal
        case currency
        case percent
        case scientific
        case spellOut
        @available(iOS 9.0, *)
        case ordinal
        @available(iOS 9.0, *)
        case currencyISOCode
        @available(iOS 9.0, *)
        case currencyPlural
        @available(iOS 9.0, *)
        case currencyAccounting
    }
}