Swift 如何暫停音頻

Question

所以我正在創建一個簡單的廣播電台應用程序。 我編寫了以下代碼並獲得了播放/暫停按鈕切換文本。 當func在ViewDidLoad中時，我只是不知道如何訪問按鈕中的播放器。 我確定我需要設置全局變量嗎？

override func viewDidAppear(_ animated: Bool) {
    guard let url = URL(string: "http://stream.radiomedia.com.au:8003/stream") else {
        return
    }

    // Create a new AVPlayer and associate it with the player view
    let player = AVPlayer(url: url)
    player.allowsExternalPlayback = true
    player.usesExternalPlaybackWhileExternalScreenIsActive = true

    // Create a new AVPlayerViewController and pass it a reference to the player.
    let playerViewController = AVPlayerViewController()
    playerViewController.contentOverlayView?.backgroundColor = UIColor.white
    playerViewController.view.frame = CGRect (x:100, y:100, width:200, height:200)
    playerViewController.player = player

    self.addChild(playerViewController)
    self.view.addSubview(playerViewController.view)
    playerViewController.didMove(toParent: self)
    playerViewController.player = player
    player.play()
}

@IBAction func playVideo(_ sender: Any) {
    if(playButton == false){
        playButton = true;
        (sender as! UIButton).setTitle("Pause", for: [])
        player.pause() // does not work
    }else
    {
        playButton = false;
        (sender as! UIButton).setTitle("Play", for: [])
        player.play() // does not work 
    }
}

Answer 1

class YourVC: UIViewController {
var player = AVPlayer()
}

只需在 class 中聲明播放器，以便其他功能可以訪問它。

並在您的 viewDidApper() 中，更改：

let player = AVPlayer(url: url)

至

self.player = AVPlayer(url: url)

然后您可以從 Class 中的任何位置調用player.pause()和player.play() 。

Answer 2

import UIKit
import AVFoundation

class AudioPlayerVC: UIViewController {

var audioPlayer = AVAudioPlayer()

override func viewDidLoad() {
    super.viewDidLoad()

    var alertSound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("wakeUp", ofType: ".mp3"))
    var error:NSError?
    audioPlayer = AVAudioPlayer(contentsOfURL: alertSound, error: &error)
    audioPlayer.prepareToPlay()
    audioPlayer.play()
}
@IBAction func onPressPlayPaush(_ sender: UIButton) {

    if(sender == false){
        sender = true
        audioPlayer.pause() 
    }else
    {
        sender = false
        audioPlayer.play() 
    }
}

Answer 3

使用AVAudioPlayer ：

import UIKit
import AVFoundation

class AudioPlayerVC: UIViewController {

    var audioPlayer:AVAudioPlayer?

    override func viewDidLoad() {
      super.viewDidLoad()

      audioPlayer = try? AVAudioPlayer(contentsOf: URL(string: "http://stream.radiomedia.com.au:8003/stream")!)
      audioPlayer?.prepareToPlay()
      audioPlayer?.play()
    }
}
@IBAction func onPressPlayPaush(_ sender: UIButton) {
    audioPlayer != nil && audioPlayer!.isPlaying ? audioPlayer?.pause() : { audioPlayer?.play() }()
}

使用AVPlayer ：

import UIKit
import AVFoundation

class AudioPlayerVC: UIViewController {

    var audioPlayer:AVPlayer!

    override func viewDidLoad() {
      super.viewDidLoad()

        audioPlayer = AVPlayer(url: URL(string: "http://stream.radiomedia.com.au:8003/stream")!)
        audioPlayer!.play()
    }
}
@IBAction func onPressPlayPaush(_ sender: UIButton) {
        audioPlayer!.timeControlStatus == .playing ||
        audioPlayer!.timeControlStatus == .waitingToPlayAtSpecifiedRate
            ? audioPlayer?.pause() : { audioPlayer?.play() }()
}