let photoButton:UIButton = {
    let but = UIButton(type: .custom)
    but.layer.cornerRadius = 40
    but.layer.borderColor = UIColor.white.cgColor
    but.layer.borderWidth = 4
    but.clipsToBounds = true
    but.addTarget(self, action: #selector(takeVideo), for: .touchDown)
    but.addTarget(self, action: #selector(stopVideo), for: [.touchUpInside, .touchUpOutside])
    but.translatesAutoresizingMaskIntoConstraints = false
    return but
}()

@objc func takeVideo() {
    progressBar.isHidden = false

    timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(updateProgressbar), userInfo: nil, repeats: true)
    timer?.fire()
}

@objc func stopVideo() {
    timer?.invalidate()
    // stop video
}

@objc private func updateProgressbar() {
    let maxLength = 7.0
    let difference = Date().timeIntervalSince1970 - (timer?.fireDate.timeIntervalSince1970)!

    progressBar.progress = Float(difference / maxLength)
    if difference >= maxLength {
        stopVideo() // Invalidates the timer and will stop video.
    }
}

let recorder = RecorderViewController()
recorder.db = db
DispatchQueue.main.async(execute: {
    self.present(recorder, animated: true, completion: nil)
})