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

For Swift 4.0 (modified version of svmrajesh's answer… or at least what Xcode turned it into before it would run it for me.)

func deleteAllData(entity: String) {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let managedContext = appDelegate.persistentContainer.viewContext
let fetchRequest = NSFetchRequest(entityName: entity)
fetchRequest.returnsObjectsAsFaults = false

do
{
    let results = try managedContext.fetch(fetchRequest)
    for managedObject in results
    {
        let managedObjectData:NSManagedObject = managedObject as! NSManagedObject
        managedContext.delete(managedObjectData)
    }
} catch let error as NSError {
    print("Delete all data in \(entity) error : \(error) \(error.userInfo)")
}
}

Implementation:

deleteAllData(entity: "entityName")