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Re: What to use observeValueForKeyPath: context
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Re: What to use observeValueForKeyPath: context


  • Subject: Re: What to use observeValueForKeyPath: context
  • From: Jim Correia <email@hidden>
  • Date: Fri, 29 Aug 2008 12:56:01 -0400

On Aug 29, 2008, at 12:43 PM, Keith Duncan wrote:

After all, what prevents somebody else from using 1091 too?

Nothing whatsoever. But that isn't a problem. So long as the observation context remains internal it doesn't have to be universally unique.

It has to be unique within an inheritance hierarchy.

The context is the only thing you use to determine if an - observeValueForKeyPath:... was meant for you, or for one of your superclasses.

If you use a magic number, you have no guarantee that a superclass didn't also use the same magic number. Solution: don't use magic numbers.

Jim

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References: 
 >What to use observeValueForKeyPath: context (From: Dave Dribin <email@hidden>)
 >Re: What to use observeValueForKeyPath: context (From: "Michael Ash" <email@hidden>)
 >Re: What to use observeValueForKeyPath: context (From: Keith Duncan <email@hidden>)

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