I have a property which is a CGPoint and I'm observing it. I didn't really know
what to expect in the change dictionary (I have NSKeyValueObservingOld as the
observation flags) so I stuck in a breakpoint and went looking. After messing
about in the debugger when the property was changed I found the old value was
an NSConcreteValue and the following code appears to work to extract the
CGPoint from it
CGPoint oldPoint;
id oldValue = [ change valueForKey:NSKeyValueChangeOld ];
[ (NSValue*)oldValue getValue:&oldPoint ]
Is this correct? I've failed to find anything much in the KVO documentation
about CGPoint or how I should expect to receive structs or other primitives.
This is iPhone OS (incase that makes a difference).
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