金额格式化加逗号

有小数点的格式化方法

-(NSString*)strmethodComma:(NSString*)string

{
   
    NSString *sign = nil;
   
    if ([string hasPrefix:@"-"]||[string hasPrefix:@"+"]) {
       
        sign = [string substringToIndex:1];
       
        string = [string substringFromIndex:1];
       
    }
   
    NSString *pointLast = [string substringFromIndex:[string length]-3];
   
    NSString *pointFront = [string substringToIndex:[string length]-3];
   
    NSInteger commaNum = (pointFront.length-1)/3;
   
    NSMutableArray *arr = [NSMutableArray array];
   
    for (NSInteger i = 0; i < commaNum+1; i++) {
       
        NSInteger index = pointFront.length - (i+1)*3;
       
        NSInteger leng = 3;
       
        if(index < 0)
        {
            leng = 3+index;
           
            index = 0;
        }
       
        NSRange range = {index,leng};
       
        NSString *stq = [pointFront substringWithRange:range];
       
        [arr addObject:stq];
       
    }
   
    NSMutableArray *arr2 = [NSMutableArray array];
   
    for (NSInteger i = arr.count - 1; i>=0; i--) {
        [arr2 addObject:arr[i]];
    }
   
    NSString *commaString = [[arr2 componentsJoinedByString:@","] stringByAppendingString:pointLast];
   
    if (sign) {
   
        commaString = [sign stringByAppendingString:commaString];
       
    }
    return commaString;
   
   
   

}

无小数点格式化加逗号

-(NSString *)countNumAndChangeformat:(NSString *)num
{
    int count = 0;
    long long int a = num.longLongValue;
    while (a != 0)
    {
        count++;
        a /= 10;
    }
    NSMutableString *string = [NSMutableString stringWithString:num];
    NSMutableString *newstring = [NSMutableString string];
    while (count > 3) {
        count -= 3;
        NSRange rang = NSMakeRange(string.length - 3, 3);
        NSString *str = [string substringWithRange:rang];
        [newstring insertString:str atIndex:0];
        [newstring insertString:@"," atIndex:0];
        [string deleteCharactersInRange:rang];
    }
    [newstring insertString:string atIndex:0];
    return newstring;
}