Zooming multiple subviews in an UIScrollView

Question

How would I go about zooming multiple subviews of an UIScrollView simultaneously? I have a UIScrollView inside another UIScrollView (with paging enabled) and inside the inner scrollview I have four UIImageViews. I would like for the zoom to persist when I scroll to the next page, thus displaying the next image.

Relevant code follows:

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return self.page2;
}
+(void)updateScale:(CGFloat)newScale{
    currentScale = newScale;
}
+(CGFloat)getScale{
    return currentScale;
}

from the outer, paging enabled, scroll view and

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return imageView;
}
-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale{
    [PhotoViewController updateScale:scale];
    NSLog(@"New scale set to %01f", scale);
    NSLog(@"This should be equal to %01f", [PhotoViewController getScale]);
}

from the inner scrollview.

currentScale is updated correctly according to the log output, but when I call [page setZoomScale:[PhotoViewController getScale]]; for the updated page variable, nothing happens. page is allocated and initialized correctly.

tia tia · Accepted Answer · 2010-10-18T17:43:42

Just put all of your image views into an empty UIView, and add that view to your scroll view.

Zooming multiple subviews in an UIScrollView

1 Answers