iOS Programming Cookbook

How to do it...

1. Let's continue working in our demo to build our Todo app.
2. Create a new Group in Xcode called Model to add the model classes inside.
3. Create a new class called AbstractManager to work as a parent manager for the TasksListsManager and the TasksManager classes that we will create.
4. Add the following code in the AbstractManager class:

      import UIKit 
      import CoreData 
 
      class AbstractManager: NSObject { 
 
          /// The managedObjectContext for core data. 
          lazy var managedObjectContext: NSManagedObjectContext = { 
              let app =
                UIApplication.shared.delegate as! AppDelegate 
              return app.persistentContainer.viewContext 
          }() 
     
      } 

5. Add a new class called TasksListManager with a subclass of AbstractManager. Add the following code in TasksListManager.swift