将UISlider值从一个ViewController传递到另一个

protocol SliderDelegate: class {
    func sliderValueChanged(value: Float)
}

class FirstViewController: UIViewController {
    weak var delegate: SliderDelegate?

    @IBAction func sliderValueChanged(_ sender: UISlider) {
        delegate?.sliderValueChanged(value: sender.value)
    }
}

class SecondViewController: UIViewController, SliderDelegate {
    func sliderValueChanged(value: Float) {
        // 处理传递过来的UISlider的值
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let firstViewController = segue.destination as? FirstViewController {
            firstViewController.delegate = self
        }
    }
}

class FirstViewController: UIViewController {
    @IBAction func sliderValueChanged(_ sender: UISlider) {
        NotificationCenter.default.post(name: NSNotification.Name("SliderValueChanged"), object: sender.value)
    }
}

class SecondViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        NotificationCenter.default.addObserver(self, selector: #selector(sliderValueChanged(_:)), name: NSNotification.Name("SliderValueChanged"), object: nil)
    }

    @objc func sliderValueChanged(_ notification: Notification) {
        if let value = notification.object as? Float {
            // 处理传递过来的UISlider的值
        }
    }

    deinit {
        NotificationCenter.default.removeObserver(self)
    }
}