PanGesture

// Handling the pan gesture method

func handleGesture(recognizer:UIScreenEdgePanGestureRecognizer) {
        
        switch recognizer.state {
        case .Began: ()
        case .Changed:dismissViewControllerAnimated(true, completion: nil)
        case .Ended, .Cancelled:
            (recognizer.velocityInView(view).x < 0) ? () :
            dismissViewControllerAnimated(true, completion: nil)
        default: ()
        }
    }
    
     func safariViewControllerDidFinish(controller: SFSafariViewController)
    {
        controller.dismissViewControllerAnimated(true, completion: nil)
    }