adding childs from another class « cocos2d for iPhone

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adding childs from another class

(12 posts) (7 voices)

Started 9 months ago by ClintWall
Latest reply from ClintWall

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ClintWall
Member
Hey all,

In my app I have a level class which draws everything to the screen. I also have a enemy class. I want to make the CCSprite in the enemy class and draw it onto the screen. My code doesn't error but it also doesn't draw my enemy. This is my code in enemyClass.m
```
-(void)initAllWithX:(int)x withY:(int)y withType:(NSString *)enemyType{

	level *lvl;
	CCSprite *enemy = [CCSprite spriteWithFile:[NSString stringWithFormat:@"%@.png", enemyType]];
	ring.position = ccp(x, y);
	[lvl addChild:enemy];
	[lvl reorderChild:enemy z:10];
}
```
And in level.m
enemy1 = [[enemyClass alloc] init];

So is there a way to draw to the screen or add childs to level.m from enemyClass.m?

Thanks
Clinton
Posted 9 months ago #
alexasha
Member

*children

Posted 9 months ago #
toadkick
Member

Ha! My OCD went off on that one too.

Posted 9 months ago #
scottdurica
Member

You need to call the init method you made.

enemy1 = [[enemyClass alloc] initAllWithX: x: y: enemyType]

...and capitalize your class names...

Posted 9 months ago #
ClintWall
Member

Ok I called that method and the NSLog comes up saying that I'm in the method but the sprite still isn't drawing to the screen.

Posted 8 months ago #

bryce
Member

Try taking the addChild out of your init and placing it after you declare enemy1

enemy1 = [[enemyClass alloc] initAllWithX: x: y: enemyType];
[self addChild:enemy1];
[self reorderChild:enemy z:10];
[enemy1 release];

Posted 8 months ago #

ClintWall
Member

That still doesn't seem to be working. I tried taking the addChild out of my initAll method and keeping it in while having addChild where I declare my enemy.

Posted 8 months ago #

cocos
Member

The problem is with 'lvl', you are adding enemies to something which will cease to exist as soon as function exits:

-(void)initAllWithX:(int)x withY:(int)y withType:(NSString *)enemyType{

	level *lvl; // automatic variable
	CCSprite *enemy = [CCSprite spriteWithFile:[NSString stringWithFormat:@"%@.png", enemyType]];
	ring.position = ccp(x, y);
	[lvl addChild:enemy]; // ok
	[lvl reorderChild:enemy z:10]; //ok
}// now level *lvl is gone and nothing will be displayed

Posted 8 months ago #

ClintWall
Member

So I do I fix it. I just tried using [lvl retain] and nothing happened.

Posted 8 months ago #

KeitZer
Member

is it possible to pass in the level class as a parameter? like... pass in self?

//viewed from Level:
[[enemy alloc] initAllWithX:x withY:y withType:type toLevel:self];

//viewed from Enemy:
-(void)initAllWithX:(int)x withY:(int)y withType:(NSString *)enemyType toLevel:(Level *)lvl
{
     CCSprite *enemy = [CCSprite spriteWithFile:[NSString stringWithFormat:@"%@.png", enemyType]];
     ring.position = ccp(x, y);
     [lvl addChild:enemy]; // ok
}

would that yield errors? cuz isn't that technically adding the sprite directly do the layer (because you're passing in self)?

Posted 8 months ago #

KeitZer
Member

also, having it return a void means it won't return a sprite... which could ALSO be a fix.. (just realizing that now)

//from Level:
enemy1 = [[enemy alloc] initAllWithX:x withY:y withType:type];
[self addChild:enemy1];

//from Enemy:
-(CCSprite *)initAllWithX:(int)x withY:(int)y withType:(NSString *)enemyType
{
    CCSprite *enemy = [CCSprite spriteWithFile:[NSString stringWithFormat:@"%@.png", enemyType]];
    ring.position = ccp(x, y);

    return enemy;//right?
}

i would personally do this one as you KNOW it would work (aka, returning the sprite, then adding it in the class itself is probably safer anyways)

adding childs from another class

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