On Mar 17, 2010, at 4:11 PM, Andrew James wrote:

> I am a relative newbie to Cocoa so I trying to make sure that my code 
> reflects Cocoa's coding culture.
> 
> I'm interested in whether or not instances of Cocoa classes can be expected 
> to display default behavior.  I'll use NSBrowser's - 
> (BOOL)sendsActionOnArrowKeys as an example. In Apple's documentation there's 
> no mention of the default.
> 
> For my purposes, I want to make sure from release to release that my 
> NSBrowser instance does send an action when up/down keys are used.  Does that 
> mean as a Cocoa developer I'm content to always code [ myBrowser 
> setSendsActionOnArrowKeys: YES ] ? or Make sure the appropriate box is 
> checked in Interface Builder?

There is no hard and fast rule that I know of--that is Cocoa-specific. I would 
assert that as a general rule if you rely on a behavior, then you should always 
explicitly set it. It disambiguates your code and is future proof in case Apple 
decides to change the documented default. You may also want to file a bug 
against the doc.

HTH,

Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"

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