Doubt on Memory release « cocos2d for iPhone

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Doubt on Memory release

(9 posts) (5 voices)

Started 1 year ago by Krithik B
Latest reply from chrisco

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Krithik B
Member

Hello

I have created a CCSpriteSheet like below

CCSpriteSheet *spriteManager = [CCSpriteSheet spriteSheetWithFile:@"Test.png" capacity:10];
[self addChild:spriteManager3 z:-10 tag:3];

and i will get a sprite like below

CCSprite *Background = [CCSprite spriteWithSpriteSheet:spriteManager rect:CGRectMake(0,0,1024,200)];
[spriteManager addChild:Background z:-10 tag:31];
Background.position=CGPointMake(512, 215);

I have a doubt like whether these objects will get released from the memory when dealloc method is called?

Posted 1 year ago #
abitofcode
Moderator
Have you looked through the source? It comes with the download;

SHIFT + CMD + F

Search for CCSpriteSheet

You'll find the following in CCSpritesheet.m
```
/*
 * creation with File Image
 */
+(id)spriteSheetWithFile:(NSString*)fileImage capacity:(NSUInteger)capacity
{
	return [[[self alloc] initWithFile:fileImage capacity:capacity] autorelease];
}
```
autorelease being the key here.
Posted 1 year ago #

Mark Sawicki
Member

@krithik_b007,

The general convention is that the convenience methods return autoreleased objects.

CCSprite *spr = [CCSprite sprite...];
/* this is an autoreleased instance. Do not send a release message to it*/

CCSprite *spr = [[CCSprite alloc] initWith...];
/*You are responsible for later calling [spr release] when you are done with the object*/

-Mark

Posted 1 year ago #

Krithik B
Member

Thanks for replying me.
I know :) Its an autoreleased object .
Now my doubt is when i call replace scene all the objects from the scene is released from the memory including texture ?

Posted 1 year ago #
crmagicxxx
Member

Not textures. For the sake of better performance textures are cached. So you have to manually remove textures you don't want anymore.

http://www.cocos2d-iphone.org/api-ref/latest-stable/interface_c_c_texture_cache.html

Check methods:
- removeUnusedTextures
- removeTexture:
- removeTextureForKey:

Posted 1 year ago #
Krithik B
Member

If i use removeAllTextures then all the textures from the current scene will be removed ?

Posted 1 year ago #
crmagicxxx
Member

I already told you which methods to check and intentionally didn't point to removeAllTextures, because you don't want that, trust me.

Posted 1 year ago #
Krithik B
Member

Wow Thanks for the suggestions guys.
It worked perfectly

I have one more doubt
Suppose i create a CCSprite like below

Background_Tree = [CCSprite spriteWithSpriteSheet:Game_Page_Images_Sprite_Sheet rect:CGRectMake(1,472,480,320)];
[Game_Page_Images_Sprite_Sheet addChild:Background_Tree z:0 tag:1];

And when i remove it like Below whether it will also remove from the memory or it will just detach the child
[Game_Page_Images_Sprite_Sheet removeChild:Background_Tree cleanup:YES];

Posted 1 year ago #
chrisco
Member

This will remove it from memory also as the only object keeping a reference of it was your sprite sheet.

I'm curious why you've changed your naming style to title case with your words separated by underscores. Not that it makes a difference in your code, but it doesn't really match the standard naming conventions used in Obj-C or Cocos2d - just seems like it may make things more confusing for you in the future...

edit - I should say that it will be removed from memory AS LONG AS it's the only object holding a reference of it, which is the case in the code you've given. If some other object retains it in the meantime, then it won't be released when you remove it from the sprite sheet.

Posted 1 year ago #

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