     public override func viewDidAppear(_ animated: Bool) {
         super.viewDidAppear(animated)
         
+        originalBrightness = UIScreen.main.brightness
+        
         // Animate in the views
         UIView.animateKeyframes(withDuration: 0.6, delay: 0, options: [.calculationModeCubic], animations: {
             UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.6, animations: { 

        }, completion: nil)
    }
    
    // MARK: - Working with Power Off Slider
    
    private func setupPowerOffSliderView() {

    }
    
    func powerOffSliderDidTouchDown() {
        // If the slider value is 1, then reset the initial brightness to the original brightness
        // (the one we started with when the view was shown). This will allow the view to raise
        // the brightness back up as the slider resets back to a value of 0. Otherwise use the
        // screen's current brightness.
        initialBrightness = (powerOffSliderView.value == 1) ? (originalBrightness ?? 0) : UIScreen.main.brightness
    }
}
