• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: NSTabViewItem and NSViewController
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

 >
 _______________________________________________
 >
 > Cocoa-dev mailing
 list (email@hidden)
 >
 > Please do not post
 admin requests or moderator comments to the list.
 > Contact the moderators at
 cocoa-dev-admins(at)lists.apple.com
 >
 > Help/Unsubscribe/Update your
 Subscription:
 >
 > This email sent to
 email@hidden

_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden

  • Follow-Ups:
    • Re: NSTabViewItem and NSViewController
      • From: Keary Suska <email@hidden>
  • Prev by Date: Re: NSTabViewItem and NSViewController
  • Next by Date: Re: NSTabViewItem and NSViewController
  • Previous by thread: Re: NSTabViewItem and NSViewController
  • Next by thread: Re: NSTabViewItem and NSViewController
  • Index(es):
    • Date
    • Thread