Array of images using UIScrollView with UIImageView. When I zoom a particular image it does not zoom properly why?

- (void)viewDidLoad {
    [super viewDidLoad];

  imageScrollView.pagingEnabled=TRUE;
       [imageScrollView setAlwaysBounceVertical:NO];
    int x = 0;
    int y = 0;
    
    for (j=0; j<arrayOfImages.count;j++){
        
        imageView=[[UIImageView alloc]initWithFrame:CGRectMake(x,y,self.imageScrollView.frame.size.width,imageScrollView.frame.size.height)];
        
        [[AsyncImageLoader sharedLoader] cancelLoadingImagesForTarget:imageView];
        NSURL *url = [NSURL URLWithString:[arrayOfImages objectAtIndex:j]];                
        imageView.imageURL = url;
         [imageView setContentMode:UIViewContentModeScaleAspectFit];
        [imageScrollView addSubview:imageView];
         x=x + self.imageScrollView.frame.size.width;
    }
    
    [imageScrollView setContentOffset:CGPointMake((myInteger*self.imageScrollView.frame.size.width), self.imageScrollView.frame.size.height)];
    imageScrollView.contentSize=CGSizeMake(x, y);
    
    imageScrollView.minimumZoomScale = 1;
    imageScrollView.maximumZoomScale = 3;
    imageScrollView.delegate = self;

}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
    return imageView;
}

- (void)scrollViewDidScroll:(UIScrollView *)sender
{
  int  page = imageScrollView.contentOffset.x / imageScrollView.frame.size.width;
}

- (CGRect)centeredFrameForScrollView:(UIScrollView *)scroll andUIView:(UIView *)rView {
    CGSize boundsSize = scroll.bounds.size;
    CGRect frameToCenter = rView.frame;
 
    // center horizontally
    if (frameToCenter.size.width < boundsSize.width) {
        frameToCenter.origin.x = (boundsSize.width - frameToCenter.size.width) / 2;
    }
    else {
        frameToCenter.origin.x = 0;
    }
    
    // center vertically
    if (frameToCenter.size.height < boundsSize.height) {
        frameToCenter.origin.y = (boundsSize.height - frameToCenter.size.height) / 2;
    }
    else {
        frameToCenter.origin.y = 0;
    }
    
    return frameToCenter;
}