This sample code is not correct.

[jaws241]

@IBAction func changeCameraQuality() {
    switch cameraManager.cameraOutputQuality {
        case .high:
            qualityLabel.text = "Medium"
            cameraManager.cameraOutputQuality = .medium
        case .medium:
            qualityLabel.text = "Low"
            cameraManager.cameraOutputQuality = .low
        case .low:
            qualityLabel.text = "High"
            cameraManager.cameraOutputQuality = .high
        default:
            qualityLabel.text = "High"
            cameraManager.cameraOutputQuality = .high
    }
}

Should it be: @IBAction func changeCameraQuality() { switch cameraManager.cameraOutputQuality { case .medium: qualityLabel.text = "Medium" cameraManager.cameraOutputQuality = .medium case .low: qualityLabel.text = "Low" cameraManager.cameraOutputQuality = .low case .high: qualityLabel.text = "High" cameraManager.cameraOutputQuality = .high default: qualityLabel.text = "High" cameraManager.cameraOutputQuality = .high } }