Second UIScrollView responding when using a UIScrollView

Question

Hi all,

This is more of a check as I believe this is right but its a lot of work if I'm wrong.

I want to basically achieve fixed positioning with a scrollView. I want to have a list along the top that is always visible, scrolls horizontal only and then a scrollview beneath that to move around the information which scrolls both vertically and horizontally.

I figure I need to subclass UIScrollView and overwrite touchesBegan, touchesMoved and touchesEnded to send the touch to both UIScrollViews.

Is this right or off track?

Cheers

Answer 1

Overriding the touch events on a scroll view is probably not what you want to do. Instead you can simply use a single scroll view, and then in the parent view's -layoutSubviews or in the scroll view's delegate methods you can move the list so it's always at the same vertical position (use the scroll view's contentOffset property to determine where that should be). Both the delegate method and -layoutSubviews is called before the drawing actually occurs after the scroll view scrolls, so by always repositioning your view where you want it to be, it will appear to remain fixed to the user.