Deleting all data in a Core Data entity in Swift 3

Question

Is there a way to do a batch delete of all data stored in all of the entities in core data?

I read somewhere that in iOS 9 or 10 that apple introduced a way to do batch

Answer 1

Declare the Method for getting the Context in your CoreDataManager Class

     class func getContext() -> NSManagedObjectContext {
            guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
                return NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
            }
            if #available(iOS 10.0, *) {
                return appDelegate.persistentContainer.viewContext
            } else {
                return appDelegate.managedObjectContext
            }
        }

Call the above method from your NSManagedObject subClass:

    class func deleteAllRecords() {
            //getting context from your Core Data Manager Class
            let managedContext = CoreDataManager.getContext()
            let deleteFetch = NSFetchRequest(entityName: "Your entity name")
            let deleteRequest = NSBatchDeleteRequest(fetchRequest: deleteFetch)
            do {
                try managedContext.execute(deleteRequest)
                try managedContext.save()
            } catch {
                print ("There is an error in deleting records")
            }
    }