ios - 将 UISlider 值从一个 ViewController 传递到另一个 ViewController

Question

我正在开发 AVSpeechSynthesizer，我正在尝试将 slider 上设置的音量、音高和速率值从设置 View Controller 传递到主视图 Controller 。在设置 View Controller 中，从默认值开始，

var volume : Float = 1.0
var pitch: Float = 1.0
var rate: Float = AVSpeechUtteranceDefaultSpeechRate

和 slider 操作，

@IBAction func volumeSliderDidSlide(_ sender: UISlider) {
    volume = sender.value
    testLable.text = String(volume)
}

@IBAction func pitchSliderDidSlide(_ sender: UISlider) {
    pitch = sender.value
}

@IBAction func rateSliderDidSlide(_ sender: UISlider) {
    rate = sender.value
}

在主视图 Controller 中，

var ttsSettingsViewController: TTSSettingsViewController!

@IBOutlet weak var textBox: UITextView!
var speechSynthesizer = AVSpeechSynthesizer()
var speechUtterence : AVSpeechUtterance = AVSpeechUtterance(string: "")

override func viewDidLoad() {
    super.viewDidLoad()
    let storyBoard: UIStoryboard = UIStoryboard(name: "TTS", bundle: nil)
    ttsSettingsViewController = storyBoard.instantiateViewController(withIdentifier: "TTSSettingsViewController") as! TTSSettingsViewController
}
@IBAction func didTapSpeech(_ sender: Any) {
    if let textBoxText = textBox.text{
        speechUtterence = AVSpeechUtterance(string: textBoxText)
        speechUtterence.volume = ttsSettingsViewController.volume
        speechUtterence.pitchMultiplier = ttsSettingsViewController.pitch
        speechUtterence.rate = ttsSettingsViewController.rate
        speechSynthesizer.speak(speechUtterence)
    }
}

但仅使用音量、音高和速率的默认值，而不是通过更改在 slider 上设置的值。

Answer 1

我编写了一些与您的代码执行相同操作的代码。

在SettingViewController中

class SettingViewController: UIViewController {

    var volume: Float = 0.0

    @IBAction func slider(_ sender: UISlider) {
        volume = sender.value
    }

    @IBAction func closeButton(_ sender: Any) {
        dismiss(animated: true)
    }
}

和 ViewController.swift

class ViewController: UIViewController {

    var settingVC: SettingViewController!

    override func viewDidLoad() {
        super.viewDidLoad()
        settingVC = UIStoryboard(name: "Main", bundle: nil)
            .instantiateViewController(withIdentifier: "SettingViewController") as! SettingViewController
    }

    @IBAction func printSettingValue(_ sender: Any) {
        // Use setting view controller's value
        print(settingVC.volume)
    }

    @IBAction func showSettingView(_ sender: Any) {
        show(settingVC, sender: nil)
    }
}

所以，这是我的代码，并且效果很好。

这是我的假设。您使用的TTSSettingsViewController 的值可能与您更改的值不同。