problem with multiple animation at the same time

here is my code :

-(void) createNewImage {
UIImage * image = [UIImage imageNamed:@"abouffer_03.png"];
imageView = [[UIImageView alloc] initWithImage:image];
[imageView setCenter:[self random开发者_StackOverflow中文版PointSquare]];
 [imageViewArray addObject:imageView];
[[self view] addSubview:imageView];
[imageView release];
}

-(void)moveTheImage{
for(int i=0; i< [imageViewArray count];i++){
 UIImageView *imageView = [imageViewArray objectAtIndex:i];
imageView.center = CGPointMake(imageView.center.x + X, imageView.center.y + Y);
}
}

-(void)viewDidLoad {
[super viewDidLoad];
[NSTimer scheduledTimerWithTimeInterval:4 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];
displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(onTimer2)];
[displayLink setFrameInterval:1];
[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
imageViewArray = [[NSMutableArray alloc]init];

}

So what I want to do is http://www.youtube.com/watch?v=rD3MTTPaK98. But my problem is that after imageView is created(createNewImage) it stops after 4 seconds (maybe due to the timer).I want that imageView continue moving while new imageView are created. How can I do this please ? sorry for my english I'm french :/

---

Instead, keep a reference to the point you want all your images to move too. Using an NSTimer and moving all the images yourself in the timer will eventually slow down your app a lot (I know from experience). Use UIView animation blocks, and just tell it to move to the point when you create it.

-(void) createNewImage {
   UIImage * image = [UIImage imageNamed:@"abouffer_03.png"];
   imageView = [[[UIImageView alloc] initWithImage:image] autorelease];
   [imageView setCenter:[self randomPointSquare]];

   //Move to the centerPoint
   [self moveTheImage:imageView];

   [imageViewArray addObject:imageView];
   [[self view] addSubview:imageView];
}

-(void)moveTheImage:(UIImageView *)imageView {
   [UIView animateWithDuration:1.0
                    animations:^{
                       [imageView setCenter:centerPoint];
                    }];
}

-(void)viewDidLoad {
   [super viewDidLoad];
   imageViewArray = [[NSMutableArray alloc]init];

   //IDK what all that other code was

   centerPoint = self.view.center;
}

EDIT: Finding the UIImage during animation

You need to reference the presentation layer of the UIImageView to find its position during an animation

UIImageView *image = [imageViewArray objectAtIndex:0];
CGRect currentFrame = [[[image layer] presentationLayer] frame];

for(UIImageView *otherImage in imageViewArray) {

   CGRect objectFrame = [[[otherImage layer] presentationLayer] frame];

   if(CGRectIntersectsRect(currentFrame, objectFrame)) {
       NSLog(@"OMG, image: %@ intersects object: %@", image, otherImage);
   }
}