NSNumberFormatter 金额格式化

    NSNumber *number = [NSNumber numberWithDouble:123456789.987654];
    
    // 四舍五入的整数 123456790
    NSNumberFormatter *format0 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterNoStyle];
    // 小数形式 123,456,789.988
    NSNumberFormatter *format1 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterDecimalStyle];
    // 货币形式（本地化） $123,456,789.99
    NSNumberFormatter *format2 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterCurrencyStyle];
    // 百分数形式 12,345,678,999%
    NSNumberFormatter *format3 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterPercentStyle];
    // 科学计数法 1.23456789987654E8
    NSNumberFormatter *format4 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterScientificStyle];
    // 朗读形式 （one hundred twenty-three million four hundred fifty-six thousand seven hundred eighty-nine point nine eight seven six five four）
    NSNumberFormatter *format5 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterSpellOutStyle];
    // 序数形式 123,456,790th
    NSNumberFormatter *format6 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterOrdinalStyle];
    // 货币形式 ISO （本地化） USD123,456,789.99
    NSNumberFormatter *format7 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterCurrencyISOCodeStyle];
    // 货币形式（本地化） 123,456,789.99 US dollars
    NSNumberFormatter *format8 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterCurrencyPluralStyle];
    // 会计计数（本地化） $123,456,789.99
    NSNumberFormatter *format9 = [NSNumberFormatter localizedStringFromNumber:number numberStyle:NSNumberFormatterCurrencyAccountingStyle];

 

用两种方法实现金额格式化

- (NSString *)formatString:(NSString *)string {
    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
    [formatter setPositiveFormat:@"###,##0.00"];
    return [formatter stringFromNumber:@([string doubleValue])];
}

@interface NSString (RMB)

- (NSString *)RMBFormatString;

@end


#import "NSString+RMB.h"

@implementation NSString (RMB)

- (NSString *)RMBFormatString {
    NSString *number = self;
    if ([number doubleValue] > 0) {
        number = [NSString stringWithFormat:@"%.2f",[number doubleValue]];
        NSNumberFormatter *numFormatter = [[NSNumberFormatter alloc]init];
        numFormatter.numberStyle = NSNumberFormatterDecimalStyle;
        
        NSNumber *num = [NSNumber numberWithDouble:[number doubleValue]];
        NSString *str = [NSString stringWithFormat:@"%@",[numFormatter stringFromNumber:num]];
        if ([str rangeOfString:@"."].length > 0) {
            NSString *floatStr = [str componentsSeparatedByString:@"."][1];
            if (floatStr.length == 1) {
                str = [NSString stringWithFormat:@"%@0",str];
            } else{
                str = [str substringToIndex:([str rangeOfString:@"."].location + 3)];
            }
            return [NSString stringWithFormat:@"¥%@",str];
        } else{
            return [NSString stringWithFormat:@"¥%@.00",str];
        }
    } else {
        return @"¥0.00";
    }
}
@end