ios – 如何使用“万”(日文/中文10,000标记)设置NSNumberFormatter显示数字？

我的iOS应用程序在不同的本地化(en_US,en_AU,ja_JP等)中显示不同的货币(USD,JPY,AUD,EUR).

对于日本地区/语言(都设置在我的设备上),如果我有：

NSNumberFormatter *fmt = [[NSNumberFormatter alloc] init];
fmt.numberStyle = NSNumberFormatterCurrencyStyle;
fmt.currencyCode = @"JPY";
NSString *labelText = [fmt stringFromNumber:@1000000];

我的标签文字是¥1,000,000.但是,日文和中文的数字大于10,000可能写为100万円,这是我想要的输出.

任何想法我可以写什么代码获得100万円作为输出？

我想在我的代码检查区域设置区域中避免使用逻辑块,但是我觉得这就是我所面对的(例如,使用方法调用fmt.multipler = @(1/10000)来划分1,000获得正确的价值10,000).

解决方法

编辑：最新的这里： https://gist.github.com/fjolnir/cd72ea39be1476023adf

旧线程,但是我在找到一个解决方案的时候遇到它,所以我想我会发布我的实现.

格式化程序本身不处理円的放置,但这在外面很容易做到. (如下例所示)

下面的预期产出是：

2015-03-11 18:00:13.376 LENumberFormatter[82736:3604947] 12億3,460万円
2015-03-11 18:00:13.377 LENumberFormatter[82736:3604947] 25円

–

@import Foundation;
@import ObjectiveC.message;

typedef NS_ENUM(NSUInteger,LENumberFormatterAbbreviationStyle) {
    kLEAbbreviateShort,// 2.5m
    kLEAbbreviateNormal // 2m 5k
};

@interface LENumberFormatter : NSNumberFormatter
@property(nonatomic) BOOL abbreviateLargeNumbers;
@property(nonatomic) LENumberFormatterAbbreviationStyle abbreviationStyle;
@end


@implementation LENumberFormatter
- (instancetype)init
{
    if((self = [super init])) {
        self.abbreviationStyle = [self _usingKanjiNumbers]
                               ? kLEAbbreviateNormal
                               : kLEAbbreviateShort;
    }
    return self;
}

- (NSString *)stringForObjectValue:(id const)aObj
{
    if(!_abbreviateLargeNumbers || ![aObj isKindOfClass:[NSNumber class]])
        return [super stringForObjectValue:aObj];

    // Copy ourselves to get format the partial digits using the settings on self
    LENumberFormatter * const partialFormatter = [self copy];
    partialFormatter.currencySymbol = @"";
    if(_abbreviationStyle == kLEAbbreviateNormal)
        partialFormatter.maximumFractionDigits = 0;

    NSString *(^partialFormat)(NSNumber*) = ^(NSNumber *num) {
        NSString *(*superImp)(struct objc_super*,SEL,NSNumber*) = (void*)&objc_msgSendSuper;
        return superImp(&(struct objc_super) { partialFormatter,self.superclass },_cmd,num);
    };

    double n = [aObj doubleValue];
    BOOL const shortFormat = _abbreviationStyle == kLEAbbreviateShort;

    NSDictionary * const separators         = [self _localizedGroupingSeparators];
    NSArray      * const separatorExponents = [separators.allKeys sortedArrayUsingSelector:@selector(compare:)];

    BOOL const currencySymbolIsSuffix = [self.positiveFormat hasSuffix:@"¤"];
    NSMutableString * const result = currencySymbolIsSuffix || self.numberStyle != NSNumberFormatterCurrencyStyle
                                   ? [NSMutableString new]
                                   : [self.currencySymbol mutableCopy];
    NSUInteger significantDigits = 0;
    NSNumber *lastExp = nil;
    for(NSNumber *exp in separatorExponents.reverseObjectEnumerator) {
        double divisor = pow(10,exp.shortValue);
        if(divisor > n)
            continue;

        if(lastExp)
            significantDigits += lastExp.doubleValue - exp.doubleValue;
        lastExp = exp;

        if(self.usesSignificantDigits && significantDigits >= self.maximumSignificantDigits)
            break;

        double partialNum = shortFormat
                          ? n/divisor
                          : floor(n/divisor);
        NSString * const digits = [self _groupRecursively] && ![exp isEqual:@0]
                                ? [partialFormatter stringFromNumber:@(partialNum)]
                                : partialFormat(@(partialNum));
        [result appendFormat:@"%@%@",digits,separators[exp]];

        n = fmod(n,divisor);

        if(shortFormat)
            break; // Just use a float+first hit

        // If we make it here,partialNum is integral and we can use log10 to find the number of digits
        significantDigits += log10(partialNum) + 1;
        partialFormatter.maximumSignificantDigits -= digits.length;

    }
    if(n > 0
       && !shortFormat
       && (!self.usesSignificantDigits || significantDigits < self.maximumSignificantDigits))
    {
        partialFormatter.maximumFractionDigits = self.maximumFractionDigits;
        [result appendString:partialFormat(@(n))];
    }
    if(self.numberStyle == NSNumberFormatterCurrencyStyle && currencySymbolIsSuffix && self.currencySymbol)
        [result appendString:self.currencySymbol];

    return result.length > 0
         ? [result stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet]
         : [super stringForObjectValue:aObj];
}

- (BOOL)_usingKanjiNumbers
{
    return [self.locale.localeIdentifier rangeOfString:@"^(ja|zh)_"
                                               options:NSRegularExpressionSearch].location != NSNotFound;
}
- (NSDictionary *)_localizedGroupingSeparators
{
    if(self._usingKanjiNumbers)
        return @{ @2: @"百",@3: @"千",@4: @"万",@8: @"億" };
    else {
        NSBundle * const bundle = [NSBundle bundleForClass:self.class];
        return @{ 
            @3: [bundle localizedStringForKey:@"thousandSuffix" value:@"k " table:nil],@6: [bundle localizedStringForKey:@"millionSuffix"  value:@"m " table:nil]
        };
    }
}

- (BOOL)_groupRecursively
{
    // Return _usingKanjiNumbers if you want:
    // 12億3千4百56万7千8百90
    // Rather than:
    // 1億2,3456万7千8百90
    return NO;
}

- (instancetype)copyWithZone:(NSZone * const)aZone
{
    LENumberFormatter * const copy = [super copyWithZone:aZone];
    copy.abbreviateLargeNumbers = _abbreviateLargeNumbers;
    copy.abbreviationStyle      = _abbreviationStyle;
    return copy;
}
@end


int main(int argc,char *argv[]) {
    @autoreleasepool {
        LENumberFormatter * const f = [LENumberFormatter new];
        f.locale = [NSLocale localeWithLocaleIdentifier:@"ja_JP"];
//        f.locale = [NSLocale localeWithLocaleIdentifier:@"en_US"];
        f.numberStyle = NSNumberFormatterCurrencyStyle;
        f.abbreviateLargeNumbers = YES;
        f.abbreviationStyle = kLEAbbreviateNormal; // Automatic if using system locale
        f.maximumSignificantDigits = 5;
        f.usesSignificantDigits = YES;
//        f.currencyCode   = @"JPY";
//        f.currencySymbol = @"¥";

        if([f.locale.localeIdentifier hasPrefix:@"ja"]) {
            f.positiveFormat = @"#,##0¤";
            if([f.currencyCode isEqualToString:@"JPY"])
                // We allow ourselves this special case because *日本円 just looks dumb
                f.currencySymbol = @"円";
            else
                f.currencySymbol = [f.locale displayNameForKey:NSLocaleCurrencyCode
                                          value:f.currencyCode];
        }

        NSLog(@"%@",[f stringFromNumber:@1234567890]);
        NSLog(@"%@",[f stringFromNumber:@25]);
    }
}