scrollview sub uiscrollviews uiimageview viewForZoomingInScrollView - iphone

Question

I have main UIScrollView
mainScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 440)];
mainScrollView.pagingEnabled = YES;
imageScrollView.contentSize = CGSizeMake(320 * [myImage count], 440);
, which contain many sub UIScrollView, and each sub UIScrollView contains UIImageView
for (int i = 0; i < [myImage count]; i++)
{
imageView = [[UIImageView alloc] init];
[imageView setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];
NSString *strimage = [myImage objectAtIndex:i];
NSURL *imageUrl = [NSURL URLWithString:strimage];
[imageView setImageWithURL:imageUrl placeholderImage:[UIImage imageNamed:#"Placeholder"]];
imageView.frame = CGRectMake(0, 0, 320, 440);
subScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(320 * i, 0, 320, 440)];
subScrollView.contentSize =
CGSizeMake(imageView.frame.size.width, imageView.frame.size.height);
subScrollView.pagingEnabled = YES;
subScrollView.showsHorizontalScrollIndicator = NO;
subScrollView.showsVerticalScrollIndicator = NO;
subScrollView.delegate = self;
subScrollView.bouncesZoom = YES;
subScrollView.clipsToBounds = YES;
subScrollView.maximumZoomScale = 3.0;
subScrollView.minimumZoomScale = 1.0;
subScrollView.zoomScale = 1.0;
[mainScrollView addSubview:subScrollView];
[subScrollView addSubview:imageView];
}
, and I implement
#pragma mark UIScrollViewDelegate methods
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
return imageView;
}
The problem is when I zoom in UIImageView, assume that there are 3 sub UIScrollView, the last sub UIScrollView can zoom UIImageView normally but the other 2 when I zoom in it , it zooms sub UIScrollView instead of UIImageView, and it effect the last sub UIScrollView to be also zoom, Did I do anything wrong?
I suspect that in viewForZoomingInScrollView, it's zoom only last UIImageView (last sub UIScrollView).
Thank you in advance :)

Answer 1

Finally I figured it out, I just need to update my UIImageView when I zoom in specific UIImageView
In - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView like this:
#pragma mark -
#pragma mark UIScrollViewDelegate methods
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
for (UIImageView *iv in [scrollView subviews]) {
imageView = iv;
break;
}
return imageView;
}
Hope it may help someone, who struggle at this point as me, so you don't have to waste you time :).