app is getting crshed showing "UITableView was deallocated while key value observers were still registered with it"

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My app getting crashed while navigating back to previous ViewController from a ViewController. I have registered with observer as:

 [tblViewActvityCalender addObserver:self 

and in delloc() method, I'm removing the observer as:

[tblViewActvityCalender removeObserver:self forKeyPath:@"contentSize"];

but still I'm getting app crashed(mostly in ios 8). What I have done wrong ???Thanks in adavnce.. Crash Log:

* Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'An instance 0x7ab75400 of class UITableView was deallocated while key value observers were still registered with it. Current observation info: ( Context: 0x0, Property: 0x7a601490> )' * First throw call stack: ( 0 CoreFoundation 0x0268f946 __exceptionPreprocess + 182 1 libobjc.A.dylib 0x02318a97 objc_exception_throw + 44 2 CoreFoundation 0x0268f86d +[NSException raise:format:] + 141 3 Foundation 0x01f496d4 NSKVODeallocate + 379 4 UIKit 0x0076459b -[UIView release] + 89 5 UIKit 0x0077537a -[UIView(Hierarchy) removeFromSuperview] + 733 6 UIKit 0x00793399 -[UIScrollView removeFromSuperview] + 84 7 UIKit 0x007679bc -[UIView dealloc] + 483 8 UIKit 0x0076459b -[UIView release] + 89 9 libobjc.A.dylib 0x0232ceb1 objc_release + 65 10 libobjc.A.dylib 0x0232dd32 _ZN12_GLOBAL__N_119AutoreleasePoolPage3popEPv + 586 11 CoreFoundation 0x02571678 _CFAutoreleasePoolPop + 24 12 CoreFoundation 0x025a876e __CFRunLoopRun + 2270 13 CoreFoundation 0x025a7bcb CFRunLoopRunSpecific + 443 14 CoreFoundation 0x025a79fb CFRunLoopRunInMode + 123 15 GraphicsServices 0x0443824f GSEventRunModal + 192 16 GraphicsServices 0x0443808c GSEventRun + 104 17 UIKit 0x006fa8b6 UIApplicationMain + 1526 18 e-Care 0x0023311d main + 141 19 libdyld.dylib 0x035a8ac9 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

Try following, it may work...

  1. Remove observer in viewwilldisappear and also remove table delegates.
  2. If you have any running operation which can effect table content size, then stop it or wait for it before you move back to other screen.

How to Fix Crashing Apps on an iPhone or Android?, I am a developer of iPhone/Android and my app keeps crashing on users If you​'ve got an app that keeps going down for no apparent reason, don't (the code lines that show developers what's happening under the hood). My app getting crashed while navigating back to previous ViewController from a ViewController. app is getting crshed showing “UITableView was deallocated while

Today I face same issue...

Before remove View Or ViewController You need to remove **tableview detaSource, Delegate and tableview from screen and then after remove screen

just add follow code in your .m file.

     self.tableView.delegate = nil;
     self.tableView.dataSource = nil;
     self.tableView removeFromSuperview];

I hope it will work for you

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I recommend you reading

In an object, you use

- (void)addObserver:(NSObject *)observer
         forKeyPath:(NSString *)keyPath
            context:(void *)context

Therefor to remove the observer you should use (you did it)


However what probably happens is that your UITableView is deallocated before the object (referred as self in your code) is deallocated. Therefor the crash.

You should ensure that this object unregister before it is deallocated, maybe by doing it within viewDidDisappear

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  • Can you please paste crash log here?
  • I have pasted the crash log in my post.. u can check it...
  • is there any solution?
  • i tried it with viewDidAppear, but result is the same.