How to show multiples of a UIImageView on screen?

I'm trying to create a game that has an effect similar to firing bullets. I'm using a UIImageView and trying to create an array that copies the image and displays it as many times as the fire button is pushed. My main issue is the first image fired will disappear if another is fired, meaning there's only one image being used - no copies. This is what I have so far that has been working:

-(void)placeProjectile {

projectile.hidden = NO;

// This places the projectile near the object it is fired from. The object here is part of a different method
projectile.center = CGPointMake(object.center.x - 5, object.center.y + 10);

}

-(void)projectileMoving {

projectile.center = CGPointMake(projectile.center.x + 5, projectile.center.y + 20);

//This gives the impression of the projectile moving with the road after it lands on it
if (CGRectIntersectsRect(projectile.frame, hitRoad.frame)) {

    projectile.center = CGPointMake(projectile.center.x - 7, road.center.y);
}

}

-(IBAction) fire:(id)sender {

[self placeProjectile]; [self projectileMoving]; }

Given the above code (which works), how would I go about creating an array that allows more than one projectile to be fired at a time? I'm leaving out all the various attempts I made at it. PLEASE HELP! I've been stuck on this for weeks :(