Property not found in object type - iphone

Question

I am working on a simple core data app that uses a tableview and a detail view. I am getting the error message stating that the property managedObjectContext is not found in the object type ChildrenTVC. The problem is that it really is there. I have cleaned the project and deleted the derived data. There must be something else going on.
Here is the code for the object header:
#interface ChildrenTVC : CoreDataTableViewController <AddChildTVCDelegate>
#property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
#property (strong, nonatomic) NSFetchedResultsController *fetchedResultsController;
#end
and the code for the implementation file:
#import "ChildrenTVC.h"
#implementation ChildrenTVC
#synthesize managedObjectContext = _managedObjectContext;
#synthesize fetchedResultsController = _fetchedResultsController;
Here is the app delegate file where the error registers:
#import "AppDelegate.h"
#import "ChildrenTVC.h"
#implementation AppDelegate
#synthesize window = _window;
#synthesize managedObjectContext = __managedObjectContext;
#synthesize managedObjectModel = __managedObjectModel;
#synthesize persistentStoreCoordinator = __persistentStoreCoordinator;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: ( NSDictionary *)launchOptions
{
// Override point for customization after application launch.
UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
ChildrenTVC *controller = (ChildrenTVC *)navigationController.topViewController;
controller.managedObjectContext = self.managedObjectContext;
return YES;
}
The error is at the controller.managedObjectContext. A lot of this is boilerplate code so there is not much to it. I just can't figure out why it is not seeing the property for the managed object context. The property is in the code.
UPdate:
I ended up recreating the file entirely. I am not sure what references are still in place when a file is changed, but something was pointing to the wrong file. I had to empty the trash to get the new file work properly. It seems to work now, though. All the research I did ended up revealing that there are some things that are unexplained in Xcode.

Answer 1

I had solved this issue by entirely recreating the header file, but I never really understood why it happened. What I did not understand then were the effects of the changes that I had made to the app. The real problem was an issue in the sequence that the header files were imported. I had changed the #import in two implementation files and that caused the compiler to not read one of the header files. I could see that the code was there, but the compiler could not read the code because it was not importing it. That gave way to the error I was receiving. My solution simply reversed the change that I had made. It would more easily have been solved by simply removing the #import of the view controller header file on the app delegate. I recently tested this and it was the correct solution.

Answer 2

You are type casting the navigationController.topViewController but i assume it isn't one in reality. Try this
ChildrenTVC *controller = [[ChildrenTVC alloc] init];
NSArray *vcArray = NSArray *vcArray = [NSArray arrayWithObject:controller]:
[self.window.rootViewController setViewControllers:vcArray animated:NO];

Answer 3

What happens if you make following changes to ChildrenTVC.h
#interface ChildrenTVC : CoreDataTableViewController <AddChildTVCDelegate>
{
NSManagedObjectContext *managedObjectContext;
NSFetchedResultsController *fetchedResultsController;
}
#property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
#property (strong, nonatomic) NSFetchedResultsController *fetchedResultsController;
#end