Question

Please can anyone refer me to a tutorial or help me out with this problem. I wish to display high scores and other games statistics at game Over but I don’t seem to get a headway despite looking at tutorials and trying stuff out. I don’t seem to understand how to use NSUserdefaults to achieve this.

My codes are as follows:

Gameplaylayer.mm

- (id)initWithHUDLayer:(HUDLayer *)hudLayer {
    if ((self = [super init])) 
    {
        score = 0;
        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        NSDictionary *defaultArray = [NSDictionary dictionaryWithObject:[NSArray arrayWithObjects:[NSNumber numberWithInt:0],
                                                                        [NSNumber numberWithInt:0],
                                                                        [NSNumber numberWithInt:0],
                                                                        [NSNumber numberWithInt:0],
                                                                        [NSNumber numberWithInt:0],
                                                                        nil]
                                                                forKey:@"Scores"];
        [defaults registerDefaults:defaultArray];
        [defaults synchronize];
    }

    return self;
}


-(void)gameOver:(id)sender{

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSMutableArray *HighScores = [NSMutableArray arrayWithArray:[defaults arrayForKey:@"Scores"]];

    for (unsigned int i = 0; i < [HighScores count]; i++)
    {
        if (dist >= [[HighScores objectAtIndex:i] intValue])
        {
            [HighScores insertObject:[NSNumber numberWithInt:dist] atIndex:i];
            [HighScores removeLastObject];

            [defaults setObject:HighScores forKey:@"Scores"];
            [defaults synchronize];

            NSLog(@"Saved new high score of %i", dist);
            break;
        }
    }
}

-(void)update:(ccTime)dt {

    CGSize winSize = [CCDirector sharedDirector].winSize;

    score += (int)delta;
    dist = score - 18;

    if (!gameOver ) 
    {
        if (!lives)
        {
            gameOver = true;
            [self gameOver];    
        }
    }
}

my game over layer is as follows

-(id)init {
    self = [super init];
    if (self != nil) 
    {
        self.isTouchEnabled = YES;

        CGSize windowSize = [CCDirector sharedDirector].winSize;

        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

        NSArray *HighScores = [defaults arrayForKey:@"Scores"];

        CLabelTTF *title = [CCLabelTTF labelWithString:@"high scores" fontName:@"Courier" fontSize:32.0];

        [title setPosition:ccp(screenSize.width / 2, screenSize.height - title.contentSize.height)];

        [self addChild:title];

        NSMutableString *scoresString = [NSMutableString stringWithString:@""];

        for (unsigned int i = 0; i < [HighScores count]; i++)
        {
            [scoresString appendFormat:@"%i. %i\n", i + 1, [[HighScores objectAtIndex:i] intValue]];
        }

        CCLOG(@"scores saved %i", dist);

        CCLabelTTF *scoresLabel = [CCLabelTTF labelWithString:scoresString dimensions:CGSizeMake(screenSize.width, screenSize.height / 3) alignment:CCTextAlignmentCenter fontName:@"Courier" fontSize:40.0];

        [scoresLabel setPosition:ccp(screenSize.width / 2, screenSize.height / 2)];

        scoresLabel.color = ccc3(0, 0, 0);
        [self addChild:scoresLabel z:9];
    }
    return self;
}

Answer 1

It’s hard to understand your code, please look at this small example below.

Ok, that’s saving new score, assuming you have GameController singleton, where scores mutable array is declared and currentScore in that singleton also displays current player’s score.

-(void) saveScores {

    GameController * controller = [GameController sharedController];

    for(int i=0; i<5;i++)
    {
        if([[[controller.scores objectAtIndex:i] objectForKey:@"score"] intValue] == controller.finalscore)
        {
            break;
        }
        if([[[controller.scores objectAtIndex:i] objectForKey:@"score"] intValue] < controller.finalscore) {
            for(int j=5;j>i+1;j--) 
            {
                [controller.scores replaceObjectAtIndex:j-1 withObject:[controller.scores objectAtIndex:j-2]];
            }

            NSMutableDictionary *newEntry = [NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:controller.finalscore],@"score",@"Local player",@"name", nil];
            [controller.scores replaceObjectAtIndex:i withObject:newEntry];
            break;
        }
    }
    controller.currentScore=0;

    [[NSUserDefaults standardUserDefaults] setObject:controller.scores forKey:@"OurScores"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

You can see, that we are saving updated scores in NSUserDefaults. So, at our game start we shoul load them. I added this code to GameController init method:

- (void) loadScores {
    if([[NSUserDefaults standardUserDefaults] objectForKey:@"OurScores"] == nil) 
    {
        NSMutableDictionary *empty = [NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:0],@"score",@"empty",@"name", nil];
        for(int i=0;i<5;i++)
            [scores addObject:empty];
    } 
    else 
    {
        NSLog(@"Loading scores");
        scores = [[NSUserDefaults standardUserDefaults] objectForKey:@"OurScores"];
    }
}

And that’s how we can show this scores using cocos2d:

-(void) drawScores {
    for(int i=0; i<5; i++)
    {
        CCLabelTTF* score = [CCLabelTTF labelWithString:
                             [NSString stringWithFormat:@"%@",[[controller.scores objectAtIndex:i] objectForKey:@"name"]] fontName:@"Marker Felt" fontSize:30];
        score.anchorPoint=ccp(0,0);
        score.position = ccp(115, 180-i*35);

        CCLabelTTF* score2 = [CCLabelTTF labelWithString:
                              [NSString stringWithFormat:@"%d",[[[controller.scores objectAtIndex:i] objectForKey:@"score"] intValue] ] fontName:@"Marker Felt" fontSize:35];
        score2.anchorPoint=ccp(0,0);
        score2.position = ccp(280, 180-i*35);

        score.color=currentClr;
        score2.color=currentClr;

        [self addChild: score z:3 tag:i];
        [self addChild: score2 z:3 tag:i+15];
    }
}