Creating a Core Data model
Define your app’s object structure with a data model file.
Overview
The first step in working with Core Data is to create a data model file to define the structure of your app’s objects, including their object types, properties, and relationships.
You can add a Core Data model file to your Xcode project when you create the project, or you can add it to an existing project.
Add Core Data to a New Xcode Project
In the dialog for creating a new project, select the Use Core Data checkbox, and click Next.
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The resulting project includes an .xcdatamodeld file.
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Add a Core Data Model to an Existing Project
Choose File > New > File and select the iOS platform tab. Scroll down to the Core Data section, select Data Model, and click Next.
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Name your model file, select its group and targets, and click Create.
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Xcode adds an .xcdatamodeld file with the specified name to your project.
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