Debugging -setNeedsDisplayInRect:
Debugging -setNeedsDisplayInRect:
- Subject: Debugging -setNeedsDisplayInRect:
- From: Nick Zitzmann <email@hidden>
- Date: Thu, 26 Jul 2012 21:10:24 -0600
I've got a view that, according to Quartz Debug, is invalidating a large and unnecessary portion of the view when certain user events happen.
The problem is, I have no idea what is causing this to happen. What strategies are best for debugging the -setNeedsDisplayInRect: method to find out specifically who is calling it where and with what frame?
I can't put a symbolic breakpoint on the method, because it gets called very often, including when the app is activated, which causes Xcode to reactivate itself and get in the way. I then changed the breakpoint to auto-continue and just print the stack trace each time the method is called, but now I feel like I'm looking for a needle within a huge console log. I really need it to break when the rect is of a certain size, but the NSRect data structure is more than twice as large as a CPU register on x86_64, so the structure is placed on the stack, but how do I break on a variable buried within the stack?
Nick Zitzmann
<http://www.chronosnet.com/>
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