用逗号格式化number

gistfile1.txt

- (NSString *)formatNumberDecimal{
    if(self){
        NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
        formatter.numberStyle = NSNumberFormatterDecimalStyle;
        [formatter setMaximumFractionDigits:2];
        NSString *string = @"0";
        if([self multipleLongForNumber]){//long
            string = [formatter stringFromNumber:[NSNumber numberWithLong:[self longValue]]];
        }else{//double
            string = [formatter stringFromNumber:[NSNumber numberWithDouble:[self doubleValue]]];
        }
        return string;
    }
    return @"0";
}

- (BOOL)multipleLongForNumber{
    NSString *str = [NSString stringWithFormat:@"%@",self];
    if([str rangeOfString:@"."].location == NSNotFound){
        return YES;
    }
    return NO;
}