如何使用相同的 UI 按钮开始和停止音频？ – Swift

Question

我正在制作一个非常简单的 IOS 应用程序。 它是一个按钮，按下时会播放一个 long.wav 文件。 我希望能够再次按下按钮，音频将停止播放。 我在这里尝试了许多解决方案，因为有类似的问题，但我被卡住了。 有任何想法吗？

    import UIKit
    import AVFoundation

    class ViewController: UIViewController {

   // Making a variable called player. It is the AVAudioPlayer
      var player: AVAudioPlayer!

   // No idea what this is.
    override func viewDidLoad() {
    super.viewDidLoad()
}




//This is the key pressed. Inside is the playSound and a print for checking
@IBAction func keyPressed(_ sender: UIButton) {
    
   playSound()
print("button pressed")
    
   
}






//Turn playSound into a func – and tell it what to play and play it if button is pressed
func playSound() {
        let url = Bundle.main.url(forResource: "audio", withExtension: "wav")
        player = try! AVAudioPlayer(contentsOf: url!)
        player.play()
        

}

}

Answer 1

AVAudioPlayer具有isPlaying ( docs ) 属性，您可以检查该属性以确定在按下按钮时是否应该播放或停止播放。

import AVFoundation
import UIKit

class ViewController: UIViewController {

    // Making a variable called player. It is the AVAudioPlayer
    var player: AVAudioPlayer!

    // This is the key pressed. Inside is the playSound and a print for checking
    @IBAction func keyPressed(_ sender: UIButton) {
        if player.isPlaying {
            stopSound()
        } else {
            playSound()
        }
    }

    // Turn playSound into a func – and tell it what to play and play it if button is pressed
    func playSound() {
        let url = Bundle.main.url(forResource: "audio", withExtension: "wav")
        player = try! AVAudioPlayer(contentsOf: url!)
        player.play()
    }

    func stopSound() {
        player.stop()
    }
}

旁注：除非您希望在系统加载视图时运行自定义代码，否则不需要覆盖viewDidLoad方法。