Understanding Core Data

Our app is coming along nicely, and we are close to wrapping it up. In the previous chapter, we created a restaurant review form, the Create Review form, which allows us to take pictures or use photos from our library. We can apply filters to photos and even add more filters quickly by updating our plist file.

In this chapter, we will finish up working on the Create Review form. We will get the form fully working so that we can save the data that's entered into the form to what is known as Core Data. Core Data is a framework that handles persistent data, using what is known as Object-Relational Mapping (ORM). We will go much deeper into what Core Data is and how to use it in this chapter.

In this chapter, we will cover the following topics:

• What is Core Data?
• What are NSManagedObjectModel, NSManagedObjectContext, and NSPersistentStoreCoordinator?
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