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
