Generally KVO will be more flexible but is not without it's own unique set of problems (I'd suggest looking at http://shiftedbits.org/2008/07/24/key-value-observing-improvements/ and http://www.mikeash.com/?page=pyblog/key-value-observing-done-right.html) . I'd actually take this approach for the scenarios you described. I'd suggest taking a look at the Cocoa Fundamentals vide on the iPhone dev center as a similar example is given there.
-rob. On Dec 26, 2008, at 11:11 AM, Ashley Perrien wrote:
I'm still relatively new to Cocoa (and programming in general) and very new to iPhone but this is more of a general question I've been struggling with.What is the best / most accepted way to get a message out of an object?Scenario 1:I have a document application with an NSView that is basically a graph of a subset of the data in the document. I'd like to bo able to drag within the graph and have it change what data it's showing. How would I send a message from the view to the document either telling it to update the selection or to request new data? Delegate? Notification? Singleton? Other?Scenario 2:iPhone app (extremely simple, one view) again with data and a graph of that data. when interacting with the UIView, how do I tell the parent view that something needs changing?Basically, what's the most acceptable way for an ivar object to communicate with it's parent?Ashley Perrien Random Quote of the day: "If you understand what you're doing, you're not learning anything." -Abraham Lincoln _______________________________________________ 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/rob%40pinchmedia.com This email sent to r...@pinchmedia.com
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