How can i move continuos enemy sprite top to bottom???
<p>Here is some problem which I can not understand...
I want to move one enemy sprite top to bottom but enemy sprite is in different class and can not move it.</p>

<p>Here is code of add sprite in GameScene through Enemyscene
This is code of Enemy.m</p>

<pre><code>#import "Enemy.h"
#import "GameScene.h"

@implementation Enemy
@synthesize theGame,newSprite,lastTimeFired,firingSpeed,fireInterval,movementSpeed,launched,hp,maxHp;

-(id)initWithGame:(GameLayer *)game
{
    self=[super init];
    if(self !=nil)
    {
        CGSize size=[[CCDirector sharedDirector]winSize];
        self.theGame=game;
        self.lastTimeFired=0;
        NSLog(@"Enemy INIT ");

        int random=arc4random()%3+1;

        newSprite=[CCSprite spriteWithFile:[NSString stringWithFormat:@"enemy%d.png",random]];
        newSprite.position=ccp(100,200);
        [theGame addChild:newSprite];


        switch (random) 
        {
            case 1:
                movementSpeed=5;
                fireInterval=-1;
                break;
            case 2:
                movementSpeed=10;
                fireInterval=-1;
                break;
            case 3:
                movementSpeed=7;
                fireInterval=-1;
                break;
            case 4:
                movementSpeed=3;
                fireInterval=-1;
                break;
            default:
                movementSpeed=5;
                fireInterval=-1;
                break;
        }


    }
    return self;
}
</code></pre>

<p>And I want to move this Enemy sprite into GameScene layer and here is the code
GameScene.m</p>

<pre><code>#import "GameScene.h"
#import "Hero.h"
#import "Enemy.h"
#define STARTING_LIVES 3;
@implementation GameScene
-(id) init
{
    self =[super init];
    if(self !=nil)
    {
        [self addChild:[GameLayer node]];
    }
    return self;
}

-(void) dealloc
{
        [super dealloc];
}   
@end


@implementation GameLayer
-(id)init
{
    if(self=[super init])
    {

       Hero *hero=[[Hero alloc]initWithGame:self];
        Enemy *e=[[Enemy alloc]initWithGame:self];



        lastTimeEnemyLaunched=0;
        enemyInterval=20;
        lives=3;
        [self schedule:@selector(doThis)];
        NSLog(@"After Schedule");
    }
    return self;
}



-(void)doThis

{
    Enemy *e;

    [e update];

}

@end
</code></pre>

<p>Please help me i am new in cocos2d game development...
when i am run this code in simulator than it gives on error </p>

<p>this code gives EXC_BAD_ACCESS</p>

<pre><code> -(void) update: (ccTime) dt
    {
        if( elapsed == - 1)
            elapsed = 0;
        else
            elapsed += dt;
        if( elapsed &gt;= interval ) {
            impMethod(target, selector, elapsed);  //this code gives EXC_BAD_ACCESS
            elapsed = 0;
        }
    }
</code></pre>

<p>Please Help me....
Thanks</p>
