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Re: Responder-Chain question.
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Re: Responder-Chain question.


  • Subject: Re: Responder-Chain question.
  • From: Matt Neuburg <email@hidden>
  • Date: Tue, 13 Sep 2011 10:11:03 -0700

On Tue, 13 Sep 2011 15:01:31 +0300, Motti Shneor <email@hidden> said:
>
>I need to insert some controllers I have into the responder chain, in such a place that their functionality (IBActions and menu validation) will be available regardless of specific view focus, etc.

I do this sort of thing all the time, typically at the level just above the window:

  id nr = [window nextResponder];
  [window setNextResponder:myResponder];
  [myResponder setNextResponder: nr];

(Last line perhaps otiose but better safe than sorry.)

Here's another example, where the goal is to do menu item validation / response in a table view:

  NSResponder* r = [[myTableView enclosingScrollView] nextResponder];
  [[myTableView enclosingScrollView] setNextResponder: self];
  [self setNextResponder: r];

Typical use case is that I want to handle key events (e.g. flagsChanged:, keydown:) and/or deal with menus. I've been doing this for years and nothing bad has happened. m.

--
matt neuburg, phd = email@hidden, <http://www.apeth.net/matt/>
A fool + a tool + an autorelease pool = cool!
Programming iOS 4!
http://www.apeth.net/matt/default.html#iosbook_______________________________________________

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