On Sep 20, 2008, at 11:26, Peter Alshuth wrote:
I have a window with a scroll view that displays an image. I would
like to
have a centered symbol (another image) on top of this view
independently of
the slider positions and movements. Do I have to create another
window with
a transparent background and sync it with the movements of the other
window
in order to create a new layer?
There are easier ways than that, although it's going to depend a
little bit the behavior you want when you (say) click on either of the
images.
The easiest way is probably to make the scroll view's document view a
custom view, and in the custom view's drawRect: method, draw the
scrollable image first (positioned relative to the custom view
bounds), then draw the symbol image on top (centered on the custom
view's visibleRect).
Or subclass the view that's displaying the image, and in a drawRect:
override call [super drawRect:] then draw the symbol image centered on
the visibleRect.
Or use a custom view with two image subviews, and reposition the
symbol image subview whenever the custom view scrolls. (You can
monitor the clip view's bounds changes to detect when scrolling
happens.)
When doing this kind of thing, make sure you turn off the "copy on
scroll" checkbox for the scroll view.
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