ios - Swift:如何根据游戏状态将 UISwitch 按钮设置为设置？

Question

如何在我的设置中制作“激活/停用背景音乐”按钮？

音乐仅在游戏启动时播放。 (点击“开始”播放 -> 背景音乐也播放。)

我暂时已经编写了这个代码，但我真的不知道该怎么做。

class SettingsViewController: UITableViewController {
    // MARK: - IBOutlets
    @IBOutlet weak var backgroundgMusicLabel: UILabel!
    @IBOutlet weak var backgroundMusicSwitch: UISwitch!

    // MARK: - Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func backgroundMusicPressed(_ sender: Any) {
        if backgroundMusicSwitch.isOn {
            UserDefaults().set("On", forKey: "switch")
        } else {
            UserDefaults().set("Off", forKey: "switch")
        }
    }
}

我的 SettingsViewController

当我的 MainViewController 中有这段代码时:

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if game == .ready {
        start()
    }
}

我像这样播放音乐:

var audioPlayer: AVAudioPlayer?

func playMusic() {
    let url = Bundle.main.url(forResource: "MyMusic", withExtension: "mp3")!
    do {
        audioPlayer = try AVAudioPlayer(contentsOf: url)
        guard let audioPlayer = audioPlayer else { return }
        audioPlayer.prepareToPlay()
        audioPlayer.play()
    } catch let error {
        print(error.localizedDescription)
    }
}

Answer 1

TheValyreanGroup Globals 是正确的。

class Globals: NSObject {
    static let sharedInstance = Globals()
    var audioPlayer: AVAudioPlayer?

    func playMusic() {
        let url = Bundle.main.url(forResource: "MyMusic", withExtension: "mp3")!
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: url)
            guard let audioPlayer = audioPlayer else { return }
            audioPlayer.prepareToPlay()
            audioPlayer.play()
        } catch let error {
            print(error.localizedDescription)
        }
    }
}

但在您的情况下，请尝试以下代码:

主视图 Controller :

static let sharedInstance = Globals()
let globalVars = Globals.sharedInstance

并在您的start() 函数中添加此函数:

func checkMusicStatus() {
    let status = UserDefaults().string(forKey: "switch")
    if status == "Off"{
        if (self.globalVars.audioPlayer?.isPlaying != nil){
            self.globalVars.audioPlayer?.stop()
        }
    } else {
        self.globalVars.playMusic()
    }
}

它应该有效，希望这会有所帮助。