June 2016
Intermediate to advanced
214 pages
5h 40m
English
Content preview from Core Data in SwiftBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Building an NSFetchRequest
NSFetchRequest is the part of Core Data that causes people to think it’s a database API instead of an object hierarchy. When we want to retrieve objects from Core Data, we normally use an NSFetchRequest to do the retrieval. It’s best to view an NSFetchRequest as a way to retrieve all instances of an entity from the object hierarchy, with the option to filter the results with an NSPredicate. There are two parts to the creation of an NSFetchRequest: setting the entity to be retrieved and optionally defining an NSPredicate to filter the objects that we want retrieved.
Setting the Entity
One thing that we must do as part of every NSFetchRequest is define the entity we want returned from the fetch. We do this by passing ...
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