On May 19, 2009, at 21:19:24, Ken Thomases wrote:
On May 19, 2009, at 10:44 PM, Rick Mann wrote:
I have what I think is a very straightforward binding, but I can't
verify that it's actually working.
I created a property foo (of type NSCellStateValue, an NSInteger),
and bound a checkbox's value to it in IB. To verify that the
binding is changing the value, I implemented the getter/setter and
put a breakpoint in. It's not stopping at the breakpoint, so I
wonder what's going on.
Did you build for debugging? Are breakpoints enabled -- which is
another way of asking if you're using Run or Debug from the Run menu?
Can you set a breakpoint in a method you're sure is being called, to
verify that breakpoints are working in general?
Have you tried putting an NSLog call into the accessors? Is the log
line appearing in Xcode's Console window?
I've done all this, and it behaves as expected. My accessor is even
called initially when my code explicitly calls "self.foo = ".
What other tools are there for debugging bindings at this level?
I recommend that you override +accessInstanceVariablesDirectly for
all of your classes to return NO. That can catch cases where the
binding and instance variables are spelled/typed one way, while the
accessors are mistakenly spelled another.
Here's some other info:
http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/Troubleshooting.html
Thanks!
--
Rick
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