iOS: Delete ALL Core Data Swift

Question

I am a little confused as to how to delete all core data in swift. I have created a button with an IBAction linked. On the click of the button I have the follow

Answer 1

Here is my implementation to clear all core data in Swift 3, based on Jayant Dash's excellent (and comprehensive) answer. This is simpler due to only supporting iOS10+. It deletes all core data entities, without having to hardcode them.

public func clearAllCoreData() {
    let entities = self.persistentContainer.managedObjectModel.entities
    entities.flatMap({ $0.name }).forEach(clearDeepObjectEntity)
}

private func clearDeepObjectEntity(_ entity: String) {
    let context = self.persistentContainer.viewContext

    let deleteFetch = NSFetchRequest(entityName: entity)
    let deleteRequest = NSBatchDeleteRequest(fetchRequest: deleteFetch)

    do {
        try context.execute(deleteRequest)
        try context.save()
    } catch {
        print ("There was an error")
    }
}