Re: CGPoint and KVO
Re: CGPoint and KVO
- Subject: Re: CGPoint and KVO
- From: Roland King <email@hidden>
- Date: Sat, 3 Apr 2010 22:52:28 +0800
Thanks
pointValue didn't work on iPhone OS but CGPointValue did, luckily, as that's the one I needed. That seems to be a UIKit extension. I've switched to that.
was my original method (apart from being clunky) wrong? It did work.
On 03-Apr-2010, at 10:43 PM, Kiel Gillard wrote:
> 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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