Catalina scroll view issues
Catalina scroll view issues
- Subject: Catalina scroll view issues
- From: Redler Eyal via Cocoa-dev <email@hidden>
- Date: Sat, 14 Dec 2019 16:16:50 +0200
Hi All,
I'm getting reports from users complaining about a strange display issue on
Catalina with my app.
My app is a word-processor (not based on the cocoa text system) whose main
display shows the pages of the document. Every page is a separate view and all
the pages are subviews of one big view which resides inside a scroll view.
The problem is that when with some documents, sometimes, when the user scrolls
down the document, some pages are not drawn or even partially drawn. When the
user clicks the place where the page is supposed to appear, it shows up.
Another interesting bit is seems that while the scroll view background is
drawn, the document views (the view containing the page views) drawRect is not
called or at least not taking effect, I can tell because the pages on this view
cast a shadow which is drawn by drawing blank squares on the document view with
a transparency layer.
Last bit of info, copiesOnScroll set to NO for this view and I see that this
property is deprecated on Catalina.
So far I'm struggling with this for a couple of weeks, I wasn't able to
reproduce this at all on my machine.
I'm really desperate for an answer and while I'm not expecting anyone here to
provide me with one (wouldn't object, of course :-)) I would love if people
reading this might try to speculate to the causes of this or perhaps if you
have any direction as to what to test on my users machines in order to be able
to reproduce this.
Thanks
Eyal Redler
------------------------------------------------------------------------------------------------
"If Uri Geller bends spoons with divine powers, then he's doing it the hard
way."
--James Randi
www.eyalredler.com
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