我正在使用AVPlayer
播放来自URL
的音频。一切正常,但我不知道如何停止当前音频播放当我在一个不同的ViewController
我不想在player.pause()
中调用viewWillDisappear()
因为我想在特定情况下停止它,但我仍然想要播放应用处于非活动状态时,后台播放音频。
当应用程序处于非活动状态时,我在Xcode应用程序设置中打开了背景播放功能qazxsw poi
第二个问题:我可以改进这门课还是一切都好吗?
您需要一种与protocol AVPlayerServiceDelegate {
func playerDidUpdateCurrentPlayingTime(_ time: CMTime)
}
class AVPlayerService {
static let instance = AVPlayerService()
private var audioPlayer: AVPlayer!
public weak var delegate: AVPlayerServiceDelegate?
func setupPlayer(forURL url: URL) {
let playerItem: AVPlayerItem = AVPlayerItem(url: url)
audioPlayer = AVPlayer(playerItem: playerItem)
audioPlayer.play()
audioPlayer.addPeriodicTimeObserver(forInterval: CMTimeMakeWithSeconds(1, preferredTimescale: 1), queue: DispatchQueue.main) { (CMTime) -> Void in
if self.audioPlayer.currentItem?.status == .readyToPlay {
self.delegate?.playerDidUpdateCurrentPlayingTime(self.audioPlayer.currentTime())
}
}
}
var isPlaying: Bool {
return audioPlayer.isPlaying
}
var isPaused: Bool {
return audioPlayer.isPaused
}
var rate: Float {
return audioPlayer.rate
}
func seek(to time: CMTime) {
audioPlayer.seek(to: time)
}
func seekToBeginning() {
audioPlayer.seek(to: CMTimeMake(value: 0, timescale: 1))
}
func replay() {
audioPlayer.seek(to: CMTimeMake(value: 0, timescale: 1))
audioPlayer.play()
}
func pause() {
if let audioPlayer = audioPlayer {
audioPlayer.pause()
}
}
func play() {
audioPlayer.play()
}
func freshInstance() {
audioPlayer = AVPlayer()
}
var assetDuration: CMTime {
get {
return audioPlayer.currentItem!.asset.duration
}
}
}
对象通信的机制,以便对其执行操作。
有很多方法可以解决这个问题。
就个人而言,我会为玩家创建一个专门的类来处理实例化,加载音频资源,播放,暂停等。 然后我要么让这个类成为一个单例,所以我可以从任何地方访问它,或者将它注入并传递给将要使用它的其他类。
player
从app中的任何位置发送操作:
class MyAudioPlayer {
static let shared = MyAudioPlayer()
private var player: AVAudioPlayer?
func load(_ url: URL) {
player = try? AVAudioPlayer(contentsOf: url)
}
func play(url: URL) {
load(url: url)
player?.play()
}
func pause() {
player?.pause()
}
func stop() {
player?.stop()
}
}
至于在后台玩,即使应用程序不活跃也需要(可能在MyAudioPlayer.shared.play(someURL)
MyAudioPlayer.shared.pause()
)
AppDelegate