override func viewDidDisappear(animated: Bool) {
    if (self.isBeingDismissed() || self.isMovingFromParentViewController()) {
        // clean up code here
    }
}

override func viewDidDisappear(_ animated: Bool) {
    if (self.isBeingDismissed || self.isMovingFromParent) {
        // clean up code here
    }
}

-(void) viewDidDisappear:(BOOL)animated{

}