Wen 27/07/16

1) In viewWill/DidDisappear methods place code before [super ...].  

   
- (void)viewWillDisappear:(BOOL)animated
{
    if ([self.navigationController.viewControllers indexOfObject:self] == NSNotFound)
         {
            [self.view.window endEditing:YES]; 
            self.navigationController.toolbarHidden = YES; 
         } 

    [super viewWillDisappear:animated]; 
}