moving a imageview when spawned from an array?
<p>I'm trying to make it so when my imageviews are spawned to the screen they scroll downwards but for some reason all my astroids do is spawn in place and don't move... here's my code.</p>

<pre><code>astroidArray = [[NSMutableArray alloc] init];

UIImage *astroid = [UIImage imageNamed:@"astroidwhite.png"];



 UIImageView *astroids = [[UIImageView alloc] initWithImage:astroid];

 //set X and Y of the new imageView

 astroids.center = CGPointMake(100 , 100 );

astroids.center = CGPointMake(astroids.center.x - astroidVelocity.x ,    astroids.center.y - astroidVelocity.y);

astroidVelocity = CGPointMake(0,5);


 //add to array
 [astroidArray addObject:astroids];

 //add to the view, so it gets displayed.


 [self.view addSubview: astroids];
</code></pre>
