Using Core Data changes how data is accessed, created, deleted, and updated. To convert each part of an app, you need to identify those differences and add or change relevant code. Table 9-1 shows the differences and changes needed for
Cars Table Change 1: Adding the Managed Object Context
The first change requires a reference to the managed object context.
AppDelegate already has one, so all the cars table controller needs is a reference. Since the managed object context is used in many methods, it is worth setting up an instance ...