Delete/Reset all entries in Core Data?

Question

Do you know of any way to delete all of the entries stored in Core Data? My schema should stay the same; I just want to reset it to blank.

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Edit

Answer 1

Updated Solution for iOS 10+

Use NSBatchDeleteRequest to delete all objects in the entity without having to load them into memory or iterate through them.

// create the delete request for the specified entity
let fetchRequest: NSFetchRequest = MyEntity.fetchRequest()
let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)

// get reference to the persistent container
let persistentContainer = (UIApplication.shared.delegate as! AppDelegate).persistentContainer

// perform the delete
do {
    try persistentContainer.viewContext.execute(deleteRequest)
} catch let error as NSError {
    print(error)
}

This code has been updated for iOS 10 and Swift 3. If you need to support iOS 9, see this question.

Sources:

• Core Data: Quickest way to delete all instances of an entity (includes Objective-C code)
• What's New in Core Data (WWDC 2015 video)
• What's New in Core Data (WWDC 2016 video)
• How to Use Core Data in iOS 10
• What’s new in Core Data Swift 3.0