Objective C:Object Deallocated while key value observers were still registered with it

Question

I am hitting the below error after I added 2 additional fields to my core data model.

CarPark_CarPark_ was deallocated while key value observers were still r         


        

Answer 1

It's probably due to the observer being deallocated before the objects being observed. You would need to implement the -(void) dealloc method to remove all observed objects in the observer.

Answer 2

To set the breakpoint open the breakpoints tab in Xcode 4 (Breakpoints window in Xcode 3) and add a new symbolic Breakpoint for the symbol "NSKVODeallocateBreak"

Use the debugger console to print the observer at the adress given in the observation info

Observer: 0x19af20

po 0x19af20

This should give some valuable information about the observer. Override addObserver:forKeyPath:options:context: in your custom CarPark class and set a breakpoint to see the exact location of the observing being established.