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Re: Binding to NSUserDefaults
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Re: Binding to NSUserDefaults


  • Subject: Re: Binding to NSUserDefaults
  • From: Ken Thomases <email@hidden>
  • Date: Sun, 17 Mar 2013 18:17:45 -0500

On Mar 17, 2013, at 6:00 PM, Seth Willits wrote:

> On Mar 17, 2013, at 11:31 AM, Ken Thomases wrote:
>
>>> In nibs we bind to NSUserDefaults through NSUserDefaultsController, but is there any point in using NSUserDefaultsController when binding to a default through code? (Or using KVO, also.) It's always seemed to work monitoring NSUserDefaults directly.
>>
>> Yes, you should bind through NSUserDefaultsController, regardless.  Bindings established in IB are not significantly different from bindings established in code.
>>
>> NSUserDefaults is not KVO-compliant.  It may work to fetch the value on a one-time basis (i.e. KVC), but you're not guaranteed to be informed when a default changes.
>
> Question is, when does it not work?

The answer is always: at the worst possible moment.  It's unpredictable because it's not guaranteed to work (nor is it guaranteed not to work).  In general no property of a Cocoa class can be relied upon to be KVO-compliant unless it is documented to be so.

It might behave differently on different versions of the OS, or different machines.

> I've yet to see it fail.

Why rely on empiricism when the documentation establishes that NSUDC is what you should use?

Regards,
Ken


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References: 
 >Binding to NSUserDefaults (From: Seth Willits <email@hidden>)
 >Re: Binding to NSUserDefaults (From: Ken Thomases <email@hidden>)
 >Re: Binding to NSUserDefaults (From: Seth Willits <email@hidden>)

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