前言:

1.项目里涉及到了金额
2.我们的金额是整数，单位是分

需求

格式化金额，分转元，保留两位小数，加上人民币符号，三位一个逗号，于是我写了个函数。

- (NSString *)formatToTwoDecimal:(id)count {
    NSString *originNumber;
    if ([count isKindOfClass:[NSString class]] || [count isKindOfClass:[NSNumber class]]) {
        NSInteger i = [count integerValue];
        originNumber = [NSString stringWithFormat:@"%ld",(long)i];
    } else {
        return @"￥0.00";
    }
    NSDecimalNumber *one = [NSDecimalNumber decimalNumberWithString:originNumber];
    NSDecimalNumber *two = [NSDecimalNumber decimalNumberWithString:@"100"];
    NSDecimalNumber *thr = [one decimalNumberByDividingBy:two];
    
    NSNumberFormatter *formatter = [[NSNumberFormatter alloc]init];
    formatter.positiveFormat = @",###.##";
    NSString *money = [formatter stringFromNumber:[NSNumber numberWithDouble:[thr doubleValue]]];
    
    NSString *result = [NSString stringWithFormat:@"￥%@",money];
    
    if (![result containsString:@"."]) {  //被整除的情况
        result = [NSString stringWithFormat:@"%@.00",result];
    } else {                              //小数不足两位
        NSArray *array = [result componentsSeparatedByString:@"."];
        NSString *subNumber = array.lastObject;
        if (subNumber.length == 1) {
            result = [NSString stringWithFormat:@"%@.%@0",array.firstObject, array.lastObject];
        }
    }
    return result;
}

测试截图