Re: Who owns a child view controller?
Re: Who owns a child view controller?
- Subject: Re: Who owns a child view controller?
- From: Steve Christensen <email@hidden>
- Date: Fri, 14 Jul 2017 06:40:16 -0700
On Jul 14, 2017, at 3:50 AM, Jeremy Hughes <email@hidden> wrote:
>
> I’m still not entirely clear on when autorelease pools are used in Swift.
> There is a WWDC video which says that they’re used in code that interfaces
> with Objective-C, but Greg Parker’s comments in this thread indicate that
> autorelease is also used behind the scenes in native Swift code - except that
> in many cases the compiler is able to optimise it out of existence. Apple’s
> Swift book doesn’t mention autorelease.
I think the hazard here is that you are trying to build a mental model of when
to expect autorelease pools (or autorelease behavior in general) and when not
to. Worse, that you might design your code to fit those expectations.
I think it's a lot safer to understand how strong/weak/unowned work and go from
there. You do the appropriate thing to hang onto an object while you're using
it and then do the appropriate thing when you're done with it (which might be
as simple as setting a variable to nil). Once you're done with the object, it's
somebody else's task to make sure that the right things happen at the right
time (that's their right time, not yours).
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