Question

我将AVFoundation.framework添加到我的项目中。在我的项目导航器中，我添加了文件＆＃34; Horn.mp3＆＃34;，这是1秒的声音。

当按下按钮（带有号角的图像）时，声音应该播放，标签也应该改变它的文字。

标签正在改变它的文字，但声音没有播放。

这是我的代码：

import UIKit
import AVFoundation

class ViewController: UIViewController {

    @IBAction func hornButtonPressed(_ sender: Any) {
        playSound()
        hornLabel.text = "Toet!!!"
    }

    @IBOutlet weak var hornLabel: UILabel!

    func playSound(){
        var player: AVAudioPlayer?
        let sound = Bundle.main.url(forResource: "Horn", withExtension: "mp3")
        do {
            player = try AVAudioPlayer(contentsOf: sound!)
            guard let player = player else { return }
            player.prepareToPlay()
            player.play()
        } catch let error {
            print(error.localizedDescription)
        }

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

Answer 1

您需要将AVPlayer的声明移至类级别。在方法中声明它们时，AVPlayer无法播放声音。

class ViewController: UIViewController {
    var player: AVAudioPlayer? // <-- notice here

    @IBAction func hornButtonPressed(_ sender: Any) {
        playSound()
        hornLabel.text = "Toet!!!"
    }

    @IBOutlet weak var hornLabel: UILabel!

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

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

AVAudioPlayer Swift 3没有播放声音

1 个答案: