NSView has a method getRectsBeingDrawn:count: which gives you the actual rects being drawn in a drawRect: call. Is there something equivalent for a UIView? Does UIView even do as I believe NSView does and only invalidate just the areas passed to setNeedsDisplayInRect:, meaning those are the only areas you actually need to redraw, or does it blow away the entire containing rectangle so you must repaint the entire area?
I have a time-series view which only invalidates a tiny sliver of view which changed and only draws that in drawRect:. However when the series gets long enough it trims the left hand end, so two tiny slivers of view are invalidated, one at each end, drawRect: coalesces them into one rect the entire size of the window and the whole series redraws on every iteration. I spotted this when I left the simulator running for an hour and the fans suddenly started spinning up. I can work around it by overriding setNeedsDisplayInRect: and queuing up non-contiguous updates, releasing them only when drawRect has been called, but it would be nice not to have to. I suspect I’m SOL on this one. _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
