CGPoint and KVO
CGPoint and KVO
- Subject: CGPoint and KVO
- From: Roland King <email@hidden>
- Date: Sat, 3 Apr 2010 22:40:23 +0800
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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