Check out the Leaks tool in Instruments (inside Xcode.app)

—Rob


> On Nov 27, 2018, at 3:56 PM, Casey McDermott <supp...@turtlesoft.com> wrote:
> 
> Our main window has a tool bar across the top, an outline view on the left, 
> and a tab view on the right.  Choosing an item from the outline view fills a 
> data entry screen into a new tab on the right. 
> 
> We started out using OS 10.11, but just switched to newer OS versions.  10.12 
> has a couple display quirks but runs OK.  In 10.13 and newer, switching tabs 
> often crashes.  It gives a warning about releasing a data entry field that is 
> already released.
> 
> In C++, we would diagnose this with a breakpoint in the destructor and then 
> check the stack trace.  But with ARC, a breakpoint at dealloc just shows 
> performDelayedCleanup and then main.  No clues to what's wrong.
> 
> Is there lore or are there tools for tracking object lifetimes in Obj-C/ARC?
> 
> Anything that changed in 10.13 that might be biting us?
> 
> Thanks,
> 
> Casey McDermott
> TurtleSoft.com
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