Display a CCSprite seven times

Question

I am a beginner in Cocos2d and I wanted to display 7 coins in a horizontal pattern. So this is what I wrote in my main gameplay layer:

In my init, I have this

coins  = [CCSprite spriteWithFile:@"coins.png"];

I made a method for the coin patterns I want it to be in (display seven times across)

- (void)coinPatterns {
    coins.position = ccp(150,150);

    for(int i = 0; i < 7; i++)
    {
        coins.position = ccp (coins.position.x + 20, coins.position.y);
        [self addChild:coins];
    }
}

And then I added this in my update method

[self coinPatterns];

But for some reason, my code keeps crashing. Does anyone know how I can fix this?

Thanks!

Answer 1

I think what you want to do here is create a separate sprite node for each coin, instead of reusing the same one over and over (I'm not even sure if that works). You would do that like this

- (void)coinPatterns {
    NSInteger originalX = 150;
    for(int i = 0; i < 7; i++)
    {
        CCSprite *coin = [CCSprite spriteWithFile:@"coins.png"];
        coin.position = ccp(originalX, 150);
        originalX += 20;
        [self addChild:coin];
    }
}

This creates 7 coins, each spaced by 20. Also, in the code you provided, all 7 coins would have been stacked on top of each other, since the x value was never actually incremented. If you use this, it's unnecessary to have the variable or property coins.

If you want to access these coins later, for example to see if a character hit into them, you could make an NSMutableArray property coinArray and then to add each coin to the array add the line [self.coinArray addObject:coin]; to the for-loop under [self addChild:coin];. That would put them all in the array.

To detect a collision, do something along the lines of this

- (void)characterMoved:(CCSprite *)character 
{
    for (CCSprite *coin in self.coinArray)
    {
        if (CGRectIntersectsRect(coin.frame, character.frame)
            // character and coin collided, add points or remove the coin or something
     }
}

This would need you to have a method characterMoved: that fires every time the character moves.