Re: CGPoint and KVO
Re: CGPoint and KVO
- Subject: Re: CGPoint and KVO
- From: Kiel Gillard <email@hidden>
- Date: Sun, 4 Apr 2010 01:43:18 +1100
On 04/04/2010, at 1:40 AM, Roland King wrote:
> 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.
In the case of NSPoint/CGPoint:
CGPoint oldPoint = [oldValue pointValue];
> This is iPhone OS (incase that makes a difference). _______________________________________________
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