> On Jun 16, 2017, at 3:27 PM, Jerome Krinock <[email protected]> wrote: > >> On 2017 Jun 16, at 10:35, Quincey Morris >> <[email protected] >> <mailto:[email protected]>> wrote: >> >> it takes additional custom code (like in the joystick example) to implement >> the other direction. At least, that’s what I’ve been saying for years, >> though I don’t think I’ve ever found a developer who believes me. > > I believe you. I think it was on your advice I've done this: > > foo.bind("xxx", to: bar, ... ); > bar.bind("yyy", to: foo, ... ); > > It works, but only in both directions with both statements.
This is incorrect. The recommended way to implement a two-way binding is to override .bind(…) on the target object and set up KVO observations there. See this page in the docs: https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/HowDoBindingsWork.html <https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/HowDoBindingsWork.html> Charles _______________________________________________ Cocoa-dev mailing list ([email protected]) 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
