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

static func fetch(entity: T.Type, withPredicate predicate: NSPredicate? = nil) -> Array? where T : NSManagedObject {
    let request: NSFetchRequest = NSFetchRequest(entityName: String(describing: T.self))
    request.predicate = predicate
    do {
        return try context.fetch(request)
    }catch{
        print(error.localizedDescription)
    }
    return nil
}

 static func delete(_ object: T) where T : NSManagedObject {
    context.delete(object)
    saveContext()
}

static func reset(entity: T.Type) where T : NSManagedObject {
    fetch(entity: entity.self)?.forEach{
        delete($0)
    }

}