On Jan 15, 2010, at 4:10 PM, Rick Mann wrote: >> If not, this could be done (with performance penalty) using the layer's mask >> property. Simplest way I can think is to make a new layer, assign the >> contents of the parent layer to that new layer's contents, then assign that >> layer as the mask of all subviews. This may require a bit of futzing around >> to get right however. > > The subviews will consist of a UIScrollView and a set of UIButtons. > Generally, I'd like to avoid subclassing them, if possible. I'm implementing > a control with behaviors very similar to a horizontal UIPickerView. > Unfortunately, it lives in a non-rectangular shape, and the surrounding > elements are transparent and should NOT show the control underneath.
I don't see any reason why the mask property wouldn't work for that, as log as the performance is acceptable to you (I believe using a mask will cause an offscreen render to occur). That said, if you can possibly invert this (that is, invert the mask and draw the content *above* the others) you should have better performance. That and I think I spoke a little fast on the exact usage of the mask – iirc, you should only need to apply it to a common parent and it should affect all children as well. -- David Duncan Apple DTS Animation and Printing _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
