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). >> _______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/cocoa-dev/kiel.gillard%40gmail.com >> >> This email sent to kiel.gill...@gmail.com > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
