Re: NSTabViewItem and NSViewController
Re: NSTabViewItem and NSViewController
- Subject: Re: NSTabViewItem and NSViewController
- From: Casey McDermott <email@hidden>
- Date: Thu, 04 Apr 2019 15:29:02 +0000 (UTC)
The tab view item has a strong reference to the view controller, but the
controller is released
even though the tab view item still exists. So, selecting the tab hits the
controller ref and it
crashes with EXC_BAD_ACCESS. My guess is it's released when the NSTabView
switches views, but a breakpoint at dealloc doesn't help much.
However, we were not using a NSTabViewController. We'll try that now.
Thanks,
Casey McDermott
Turtle Creek Software
--------------------------------------------
On Thu, 4/4/19, Keary Suska <email@hidden> wrote:
Subject: Re: NSTabViewItem and NSViewController
To: "Casey McDermott" <email@hidden>
Cc: "Cocoa-Dev (Apple)" <email@hidden>
Date: Thursday, April 4, 2019, 10:01 AM
Who owns the view controller?
Apparently, no-one, sine ARC is deallocating it once the
last reference to it (the tab view item) is deallocated. If
there is supposed to be an owner, make sure the owner’s
reference is strong. If you can target 10.10+, using
NSTabViewController is probably a better choice.
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or
business"
> On Apr 4, 2019, at
7:43 AM, Casey McDermott <email@hidden>
wrote:
>
> We have a
tab view with tabs added from code. Each tab uses a
NSTabViewItem subclass,
> which contains
a reference to a NSViewController subclass within it to
manage tab contents.
> Users click to
add and remove tabs.
>
> It works fine without ARC, with the
NSTabView controlling the viewer lifetime.
> With ARC, it works fine with one tab.
However the view controller is released and deallocated
> when a second tab is added, so switching
tabs causes a crash from the invalid reference.
>
> Is there some way to
see what is releasing the view controller? It's
nothing in our code.
> NSTabView seems
the likeliest culprit?
>
> NSTabViewItem is not a NSView subclass.
Does that prevent it from managing lifetime for a view and
view controller?
>
>
Thanks,
>
> Casey
McDermott
> Turtle Creek Software
>
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