Extended NSArrayController in swift

ExtendedArrayController.swift

extension NSArrayController {
    /// Method which can be binded in storyboard to remove all objects from array controller
    @IBAction func removeAllObjects(sender: AnyObject) {
        let range = NSMakeRange(0, self.arrangedObjects.count)
        self.removeObjectsAtArrangedObjectIndexes(NSIndexSet(indexesInRange: range))
    }
}