selector problem « cocos2d for iPhone

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selector problem

(9 posts) (2 voices)

Started 6 months ago by gametreesnet
Latest reply from clarus

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Hello, I have a problem with selector.
I am trying to make an array of objects moving in a sequence.
Therefore, I wrote this code:

-(void)arrayEnemy{
    CGSize size = [[CCDirector sharedDirector] winSize];
    int r = arc4random() % 200;
    spriteArray =[[NSMutableArray alloc]init];

    for (i =1; i<7;i++ ) {
        enemy = [[Enemy alloc] initWithFile:@"Icon-Small.png"];
        [enemy setPosition:ccp(size.width /r, size.height /2)];
        [self addChild:enemy];
        enemy.tag = 1;
        [spriteArray addObject:enemy];

    }
}

-(void)something{
    CGSize size = [[CCDirector sharedDirector] winSize];
    [CCMoveBy actionWithDuration:2 position:ccp(size.width/2,0)];
}

-(void)follow{
    [CCFollow actionWithTarget:[spriteArray objectAtIndex:0] worldBoundary:CGRectMake(3, 4, 2, 3)];
    CCLOG(@"HEEE");
}

-(void)animation{
    id moveAction = [CCCallFunc actionWithTarget:[spriteArray objectAtIndex:0] selector:@selector(something)];
    id b = [CCCallFunc actionWithTarget:[spriteArray objectAtIndex:1] selector:@selector(follow)];
    id c = [CCDelayTime actionWithDuration:3];
    [self runAction:[CCSpawn actions:moveAction, c, b, nil]];
}

When I run it, the app stops and in the line: [targetCallback_ performSelector:selector_]; there is a SIGABRT signal.
I'm pretty sure this is something to do with the selector because I retyped so selector wouldn't be called and it worked.
However, I need selector because I need to make actionWithTarget.
I spent hours and hours to fix this problem and went through cocos2d document and reference, but I couldn't fix my problem.
Help me please.
Thanks.

Posted 6 months ago #

clarus
Member

The targets are wrong for your CCCallFuncs. The target should be the object that will respond to the selector. In this case, self. If you want to pass the node as well, use CCCallFuncN and change your selectors and methods to match.

Posted 6 months ago #
gametreesnet
Member
Thanks for the explanation. I didn't know the difference between CCCallFuncs and CCCallFuncN.
However, I changed the code to:
```
id moveAction = [CCCallFuncN  actionWithTarget:self selector:@selector(something)];
    id b = [CCCallFuncN actionWithTarget:self selector:@selector(follow)];
    id c = [CCDelayTime actionWithDuration:3];
    [enemy runAction:[CCSpawn actions:moveAction, c, b, nil]];
```
But I guess I'm not really pointing my actions because the array isn't doing anything.
Also, I may be using CCCallFuncN differently.
I know there is still something wrong with my code, but I'm not really sure...
Posted 6 months ago #

clarus
Member

The selectors for CCCallFuncN take a node parameter, so you need to adjust the selectors and methods like this:

@selector(something:) // Note the colon
@selector(follow:) // Note the colon

- (void) something: (id) node
{
        // Add the rest. The node passed is the sprite being acted upon.
}

- (void) follow: (id) node
{
        // Add the rest. The node passed is the sprite being acted upon.
}

Posted 6 months ago #

clarus
Member

Also, here's a reference for CCCallFuncN and the like:
http://www.cocos2d-iphone.org/wiki/doku.php/prog_guide:actions_special

Posted 6 months ago #

gametreesnet
Member

Thanks for the link and the demo. I changed my code to

-(void)something: (id)node{
    node = [spriteArray objectAtIndex:0];
    CGSize size = [[CCDirector sharedDirector] winSize];
    [CCMoveBy actionWithDuration:2 position:ccp(size.width/2,0)];
}

-(void)follow: (id)node{
    node = [spriteArray objectAtIndex:1];
    CGSize size = [[CCDirector sharedDirector] winSize];
    [CCMoveBy actionWithDuration:2 position:ccp(size.width/2,0)];
    CCLOG(@"HEEE");
}

-(void)animation{
    id moveAction = [CCCallFuncN  actionWithTarget:self selector:@selector(something:)];
    id b = [CCCallFuncN actionWithTarget:self selector:@selector(follow:)];
    id c = [CCDelayTime actionWithDuration:3];
    [self runAction:[CCSpawn actions:moveAction, c, b, nil]];
}

Is this correct or do I have to pass the parameter in other ways? I'm not really sure if the parameter has been declared.

Posted 6 months ago #

clarus
Member

The parameter will be passed for you, but no, it's not quite correct. The node passed is the actual node running the action. Your original animation method was trying to run an action on one sprite that referenced another sprite. I'm trying to understand what you're really after. Can you walk me through the idea?

Posted 6 months ago #
gametreesnet
Member

I fixed the problem.
I changed this:
[CCMoveBy actionWithDuration:2 position:ccp(size.width/2,0)];
to this:
[enemy runAction:[CCMoveBy actionWithDuration:2 position:ccp(size.width/2,0)]];

Now I am working on changing the code to work on some arrays.
Thanks Clarus for the posts.

Posted 6 months ago #
clarus
Member

Right, and the enemy is the node that's passed in. It's the [spriteArray objectAtIndex:1] or whatever that you ran the action on.

Posted 6 months ago #

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