ios - Swift - 选择不同声音时不播放不同声音

Question

在 Swift 中，当在 TableView 中选择不同的声音时，声音的名称将添加到变量中。在不同的 View Controller 中，它应该访问变量并在按下按钮时播放声音，尽管它只是播放相同的声音。这是代码:

FirstSoundController(播放声音):

class FirstViewController: UIViewController {
    var someVariable = SecondViewController()
    @IBAction func activation(sender: UIButton) {
        if sender.titleLabel!.text == "ACTIVATE" {
            sender.setTitle("DEACTIVATE", forState: UIControlState.Normal)

            var someSound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource(someVariable.soundSelected, ofType: "mp3")!)

            audioPlayer = AVAudioPlayer(contentsOfURL: someSound, error: nil)
            audioPlayer.prepareToPlay()
            audioPlayer.play()
        }
        else {
            sender.setTitle("ACTIVATE", forState: UIControlState.Normal)
            audioPlayer.stop()
        }
    }
}

SecondViewController(显示声音表):

class SecondViewController: UIViewController, UITableViewDataSource {
    var sounds = ["BananaSlap", "GlassBreaking", "scream", "WoodyWood", "LaughAndApplause", "EvilLaugh", "Grenade", "BadamTss", "BombExploding"]
    var soundSelected:String?
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return sounds.count
    }
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        var cell = UITableViewCell()
        cell.textLabel?.text = sounds[indexPath.row]
        return cell
    }
    func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
        var soundSelected = sounds[indexPath.row]
        println(soundSelected)
    }

}

Answer 1

我可以立即发现您的 SecondViewController 中的错误，因为您已将 soundSelected 重新声明为函数内的局部变量，而忽略了该属性。所以，而不是:

func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
    var soundSelected = sounds[indexPath.row]
    println(soundSelected)
}

我会尝试:

func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
    soundSelected = sounds[indexPath.row]
    println(soundSelected)
}