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Re: Problem with Auto Layout and drawRect
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Re: Problem with Auto Layout and drawRect


  • Subject: Re: Problem with Auto Layout and drawRect
  • From: David Duncan <email@hidden>
  • Date: Tue, 08 Sep 2015 11:11:05 -0700

> On Sep 8, 2015, at 10:57 AM, Ben Kennedy <email@hidden> wrote:
>
>
>> On 07 Sep 2015, at 5:02 pm, Graham Cox <email@hidden> wrote:
>>
>> Also, NSColor is immutable so there’s little purpose to having that property ‘copy’, it can be ‘retain’ (or ‘strong’) and it will save you a small amount of space per instance.
>
> As Dave said in his reply, isn't this actually poor advice? It obscures the semantic intent of the property, and likely makes no measurable difference anyhow (presuming that the immutable class implements copy as retain).

I would say that in general if something is copy-able, then you should copy it unless you have a really really good reason to do otherwise. Generally objects that implement copying are value objects rather than identity objects, and copying is generally the right thing to do for those.

If there is a performance issue in doing so, you should either file a bug (for SDK classes) or implement -copyWithZone: (for your own).

--
David Duncan


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References: 
 >Problem with Auto Layout and drawRect (From: Dave <email@hidden>)
 >Re: Problem with Auto Layout and drawRect (From: Graham Cox <email@hidden>)
 >Re: Problem with Auto Layout and drawRect (From: Ben Kennedy <email@hidden>)

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