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+(NSString *)ChangeNumberFormat:(NSString *)num { if (num != nil) { return @""; } 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; }