How to set high score and only changes if it is surpassed

Like the game helicopter or like Left 4 dead survival mode I want the score to stay and only change if score is surpassed. Here is the code I have so far. ./m file

                    _score = 0;
                         _oldScore = -1;
     self.scoreLabel = [CCLabelTTF labelWithString:@"" dimensions:CGSizeMake(100, 50) alignment:UITextAlignmentRight fontName:@"Marker Felt" fontSize:32];
     _scoreLabel.position = ccp(winSize.width - _scoreLabel.contentSize.width, _scoreLabel.contentSize.height);
     _scoreLabel.color = ccc3(255,0,0);
     [self addChild:_scoreLabel z:1];     



if (_score != _oldScore) {
    _oldScore = _score;
    [_scoreLabel setString:[NSString stringWithFormat:@"score%d", _score]];



}

and the .h file

       int _score;
int _oldScore;
CCLabelTTF *_scoreLabel;

I tried to put

      _score = [[NSUserDefaults standardUserDefaults] integerForKey:@"score"];

        [[NSUserDefaults standardUserDefaults] setInteger:_oldScore forKey:@"score"];
           [[NSUserDefaults standardUserDefaults] synchronize];

but when i did that it only saved the data and keeps going up rather than starting over and only change when score is surpassed.

Solution

You need to compare if your score is more than the old score and just save it then.

For example,

if (_score > _oldscore) {
  // Save out new score as it is more than the old score

  // Then reset ready for next time
  _oldscore = _score;
  _score = 0;
}

However, if you are struggling with something like this, I would suggest you are going to be in for a whole lot of problems unless you stop and learn the basics of programming now before progressing further in your development.