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;
}