Image replacement in iphone - iphone

Question

I have added some sprite by using the following code and then by checking the rect
intersection I want to replace these sprites with another one.Can you help me out by providing code
to replace these random images.Problem is that the image to be replaced is also taken
randomly.........
yp = 40;
//CCSprite *spr;
movableSprites = [[NSMutableArray alloc] init];
for(int m=0; m<4; m++)
{
do
{
i = 'a';
//NSLog(#"valueeeeeeeee %d",i);
next = arc4random()%maxalphabets;
//NSLog(#"valueeeeeeeeenexttttt %d",next);
i+=next;
//NSLog(#"valueeeeeeeee %d",i);
spr = (CCSprite*)[self getChildByTag:i];//checks if found alreadyyyyyy
NSLog(#"Strrrrrrrr is:%#",spr);
}while(spr);
spNameStr = [NSString stringWithFormat:#"%c3.png",i];
NSLog(#"tagggg %d",i);
NSLog(#"spNameStr is:%#",spNameStr);
spr = [CCSprite spriteWithFile:spNameStr ];
spr.tag = i;
//NSLog(#"tagiiiiii %d",i);
spr.position = ccp(60,yp);
[self addChild:spr z:2];
[movableSprites addObject:spr];
yp+=spr.contentSize.height+35;
}
yp = 40;
NSMutableArray *answerimagesCopy = [NSMutableArray arrayWithArray:movableSprites];
NSLog(#"answer image copy elements areeeee %#",answerimagesCopy);
for(k = 0; k < movableSprites.count; ++k)
{
NSLog(#"inside forrrr");
int j=arc4random()%([answerimagesCopy count]);
NSLog(#"valueee of jjjjjjjj %d",j);
CCSprite *ansimage = [answerimagesCopy objectAtIndex:j];
//NSLog(#"................ %#",ansimage);
p=ansimage.tag;
NSLog(#"tagg..... %d",p);
[answerimagesCopy removeObjectAtIndex:j];
//NSLog(#"tagg..... %d",j);
spNameStr = [NSString stringWithFormat:#"%c4.png",p];
NSLog(#"spNameStr is:%#",spNameStr);
//NSLog(#"tagggg %d",j);
spr = [CCSprite spriteWithFile:spNameStr ];
spr.tag = p+100;
spr.position = ccp(260,yp);
[self addChild:spr z:1];
yp+=spr.contentSize.height+35;
}

Answer 1

I have did this using sprite sheet. if you can create a sprite sheet and then assign that sprite sheet to CCSpriteBatchNode's object like
$ CCSpriteBatchNod * m_meteoritesSprites =[CCSpriteBatchNode batchNodeWithFile:#"Meteo.pvr.ccz"];
and then load plist
$[[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:#"Meteo.plist"];
and then use sprite frames to assign images to your sprite like
$ m_meteoritesSprites =[CCSpriteBatchNode batchNodeWithFile:#"Meteo.pvr.ccz"];
i used TexrturePacker to make sprite sheets
hope this helps you.