[MacRuby-devel] Implementing Delegate Functions

Laurent Sansonetti lsansonetti at apple.com
Wed Oct 1 12:24:36 PDT 2008

Hi Chris,

On Oct 1, 2008, at 11:17 AM, Chris Williams wrote:

> I am trying to port StarJour ( http://github.com/lachie/starjour/tree/master
>  ) over to MacRuby and need some assistance with how to override
> delegate functions for the NSNetServiceBrowser Is there somewhere
> (tutorial RFTM?) I can use to find this?

Implementing delegate methods is done the same way you would do it in  
Objective-C. Example:

     browser = NSNetServiceBrowser.new

     delegate = Object.new
     def delegate.netServiceBrowserWillSearch(browser)
       puts "search commencing!"
     def delegate.netServiceBrowser(browser, didNotSearch:errorInfo)
       puts "search not successful: #{errorInfo}"
     browser.delegate = delegate


You could also implement the delegate methods in a separate class and  
pass a new instance of that class to the setDelegate: method  
(available as #delegate= too) of the net service browser object.

Creating Objective-C selectors from MacRuby is discussed in the  
"Defining Methods" section of the tutorial:



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