Re: Getting notified of any change to a specific NSManagedObject?
Re: Getting notified of any change to a specific NSManagedObject?
- Subject: Re: Getting notified of any change to a specific NSManagedObject?
- From: Kyle Sluder <email@hidden>
- Date: Fri, 16 Nov 2012 09:37:35 -0800
On Nov 16, 2012, at 9:29 AM, email@hidden wrote:
>
> On Nov 15, 2012, at 8:22 PM, Rick Mann wrote:
>
>>
>> On Nov 15, 2012, at 17:04 , Kyle Sluder <email@hidden> wrote:
>>
>>> Override -didChangeValueForKey:?
>>
>> Apparently we are strongly discouraged from overriding those methods. :-)
>>
>> --
>> Rick
>
> Is this documented? What would be wrong with overriding it, calling [super didChangeValueForKey:] and then doing whatever else you need to do?
From the NSManagedObject docs:
> As with any class, you are strongly discouraged from overriding the key-value observing methods such as willChangeValueForKey: and didChangeValueForKey:withSetMutation:usingObjects:.
Two theories as to why:
- People might forget to call super.
- KVO checks to see if -didChangeValueForKey: is overridden, and if not it calls the IMP directly, bypassing ObjC message dispatch.
--Kyle Sluder
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