Responsive scrolling: prepareContentInRect: not called
Responsive scrolling: prepareContentInRect: not called
- Subject: Responsive scrolling: prepareContentInRect: not called
- From: Antonio Nunes <email@hidden>
- Date: Tue, 07 Oct 2014 16:31:39 +0200
Hi,
Wondering if anyone has an idea of why prepareContentInRect: is not called for a view when responsive scrolling is enabled.
We are using an NSScrollView subclass that overrides prepareContentInRect:. When I turn on View Debugging->Show Responsive Scrolling Status during a debug session, the scrollview area is tinted green indicating that everything is (or should be) in place for responsive scrolling. When the app is run and loads and displays a window, I can see, in the debugger, the document view’s drawRect: method being called repeatedly with dirty rects that suggest the overdraw regions are steadily being built. However, prepareContentInRect: is never called. To the best of my knowledge it should be. At least that is how I understand fit from the docs and from WWDC’14 Session 215 on responsive scrolling. An online search for issues with prepareContentInRect: did not turn up any results, suggesting that this may not be a common issue, and therefore that I may be missing some required implementation detail. Does anyone know what might be causing prepareContentInRect: not to be called when responsive scrolling does appear to be active? Anything obvious I should look for? (I have tried overriding prepareContentInRect: in the NSScrollView’s subclass, as well as in the view that serves as the scroll view’s document view. Neither of these methods gets called though.)
-António
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