I have UIScrollView with one child that is zoomed (returned in viewForZoomingInScrollView:scrollView) and a number of other children which annotate the zoomed view and should always be positioned on top of the zoomed view at relative coordinates
UIScrollView
- zoomChild (size 100x100 at scale 1)
- Annotate Child (size 10x10), always placed at relative position (0.2, 0.2) of zoomChild's frame
I've subclassed UIScrollView and overridden scrollViewDidZoom:. I position an annotation child like
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
self.annotateChild.frame = CGRectMake(0.2*100*self.zoomScale, 0.2*100*self.zoomScale, 10, 10);
}
This works fine as long as the user is interacting with the scrollview. scrollViewDidZoom:/scrollViewDidScroll:, however, seems not to be called when
zoomBounce: scrollview is pinched smaller than minZoom, user releases his finger and scrollview animates back to minScale. scrollViewDidZoom: is called when the animation is complete, but not during.
When zooming to a rect using zoomToRect:animated:. Again, scrollViewDidZoom: is not called until animation has completed.
So the question boils down to: how can I get notified whenever self.zoomScale changes, including when this happens via some internal animation?
Alternatively, can I add my annotation views as subviews to the zoomView and somehow make sure that they are not scaled?
