Choose Random Sprite Cocos2d 3.0 - cocos2d-iphone

Question

I have 4 sprites, every time the game starts it would randomly choose 1 from the 4 sprites to be the main sprite.
How can I do this?
I know I would need to use arc4random

Answer 1

The easiest way would be -- First name you image (.png) files with some numbers for e.g. sprite1.png, sprite2.png ....
int rndSprtNum = (arc4random() % 4) + 1;
CCSPrite *mainSprite = [CCSprite spriteWithFile:[NSString StringWithFormat:#"sprite%d.png",rndSprtNum]];
mainSprite.position = ccp(x,y);
[self addChild:mainSprite];
This way you no need to take a mutable array etc. Hope this helps.

Answer 2

First of all you are add all sprite in NSMutableArray as below code.
Allocate Array
NSMutableArray *AryT = [[NSMutableArray alloc]init];
Differnt sprite
CCSprite *torpedoOne1 = [CCSprite spriteWithFile:#"A#2x.png"];
CCSprite *torpedoOne2 = [CCSprite spriteWithFile:#"B#2x.png"];
CCSprite *torpedoOne3 = [CCSprite spriteWithFile:#"C#2x.png"];
Add All This sprite in define Array
[AryT addObject:torpedoOne1];
[AryT addObject:torpedoOne2];
[AryT addObject:torpedoOne3];
Take Random number from array
int RandomIndex = arc4random_uniform(AryT.count);
Randomaly sprite
[self addchild:[AryT objectAtIndesx:RandomIndex]];

Answer 3

Here's another approach, in case you don't want to rename your files you can simply put their names in an array:
NSString *names[4] = {#"RedSprite.png", #"GreenSprite.png", #"YellowSprite.png", #"PurpleSprite.png"};
CCSprite *sprite = [CCSprite spriteWithFile:names[arc4random_uniform(4)]];
[self addChild:sprite];