Question

在我的代码中，从url播放的内容如下：

private func play() {
    let streamUrl = ...        
    let playerItem = AVPlayerItem(url: streamURL)
    radioPlayer = AVPlayer(playerItem: playerItem)
    radioPlayer.volume = 1.0
    do {
         try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, with: AVAudioSessionCategoryOptions.mixWithOthers)
         try AVAudioSession.sharedInstance().setActive(true)
         UIApplication.shared.beginReceivingRemoteControlEvents()
     } catch {
         print("Error deactivating audio session.")
     }
     radioPlayer.play()
     startListeningForStreamFail()
     stopStartButton.setImage(#imageLiteral(resourceName: "pause_btn"), for: .normal)
}

就像上面解释的代码片段一样，在调用.play()函数之后，我正在调用startListeningForStreamFail()，它在主线程上将当前viewcontroller注册为两种类型的通知。

private func startListeningForStreamFail() {
    DispatchQueue.main.async { [weak self] in
        NotificationCenter.default.addObserver(self as Any, selector: #selector(self?.playerItemFailedToPlay), name: NSNotification.Name.AVPlayerItemPlaybackStalled, object: self?.radioPlayer?.currentItem)
        NotificationCenter.default.addObserver(self as Any, selector: #selector(self?.playerItemFailedToPlay), name: NSNotification.Name.AVPlayerItemFailedToPlayToEndTime, object: self?.radioPlayer?.currentItem)
    }
}

选择器功能如下：

@objc private func playerItemFailedToPlay(notification: Notification) {
    print("playerItemFailedToPlay")
}

因为流现在工作很好，我试图通过添加一些加字符来测试失败。但playerItemFailedToPlay()函数不会被调用，不会打印任何东西。

是否应该调用此选择器，即使只更改了网址？

任何帮助将不胜感激。谢谢！

Answer 1

我尝试在Github上构建一个项目以便于检查

我按照以下步骤操作：

将NSAppTransportSecurity添加到info.plist，如this answer中所示，以允许http
修剪提供的网址以删除任何空格

let urlString = urlString.trimmingCharacters(in: .whitespacesAndNewlines)
检查字符串是否提供有效链接

guard let url = URL(string: urlString) else { return complete(.unvalidURL) }
检查链接是否可播放

AVAsset(url: url).isPlayable

如果之前的任何步骤未成功，则表示该网址无效

我还在启动可播放链接后添加了一个观察者来解决错误

NotificationCenter.default.addObserver(self, selector: #selector(itemFailedToPlayToEndTime(_:)), name: .AVPlayerItemFailedToPlayToEndTime, object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(itemNewErrorLogEntry(_:)), name: .AVPlayerItemNewErrorLogEntry, object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(itemPlaybackStalled(_:)), name: .AVPlayerItemPlaybackStalled, object: nil)

iOS - 使用AVPlayer

1 个答案: