尽管有正确的 URL，但 AVPlayer 没有播放

Question

我需要代码的帮助，因为我无法弄清楚为什么我的 AVPlayer 无法播放音频。这是我的功能：

@IBAction func pausePlayAudio(_ sender: CustomButton) {
    let audioSourceURL: String = "[Site]/module_lesson_uploads/audios/"
    let audioString: String = audioSourceURL + (sender.paramaters["thisAudioURL"] as! String)
    let audioURL = URL(string: audioString)

    print(audioString)

    let playerItem: AVPlayerItem = AVPlayerItem(url: audioURL!)
    let audioPlayer = AVPlayer(playerItem: playerItem)

    audioPlayer.play()
}

这里调用：

pausePlayButton.addTarget(self, action: #selector(ModuleLessonElementsViewController.pausePlayAudio(_:)), for: .touchUpInside)
pausePlayButton.paramaters["thisAudioURL"] = content

这里是控制台打印传递的字符串的结果：

[Site]/module_lesson_uploads/audios/228F0E3-1576580339.mp3
2019-12-19 11:54:34.524954+0800 AppUI[3807:70260] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection
2019-12-19 11:54:34.688244+0800 AppUI[3807:70259] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection
2019-12-19 11:54:34.718316+0800 AppUI[3807:70261] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection
2019-12-19 11:54:34.912438+0800 AppUI[3807:70259] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection
2019-12-19 11:54:34.913975+0800 AppUI[3807:70259] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection
[Site]/module_lesson_uploads/audios/4AB4136-1576647127.mp3
2019-12-19 11:55:04.511064+0800 AppUI[3807:70259] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection
2019-12-19 11:55:04.742723+0800 AppUI[3807:70262] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection
2019-12-19 11:55:04.795568+0800 AppUI[3807:70262] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection
2019-12-19 11:55:05.042987+0800 AppUI[3807:70262] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection
2019-12-19 11:55:05.049440+0800 AppUI[3807:70262] [] nw_endpoint_flow_copy_multipath_subflow_counts Called on non-Multipath connection

它似乎工作正常，但没有播放音频。任何帮助或解释将不胜感激！

Answer 1

我检查了你的代码并发现了这样一个模式：

如果我在 viewDidLoad 之前定义并初始化 audioPlayer - 那么 audioPlayer 在 100% 的情况下都有效（我使用 this 音频）
如果我像您一样定义和初始化 audioPlayer（在 pausePlayAudio）- 有时有效，有时无效。

请检查：

var audioPlayer = AVPlayer()

@IBAction func pausePlayAudio(_ sender: CustomButton) {
    let audioSourceURL: String = "[Site]/module_lesson_uploads/audios/"
    let audioString: String = audioSourceURL + (sender.paramaters["thisAudioURL"] as! String)
    let audioURL = URL(string: audioString)

    print(audioString)

    let playerItem = AVPlayerItem(url: audioURL!)
    self.audioPlayer = AVPlayer(playerItem: playerItem)

    self.audioPlayer.play()
}

Answer 2

您的错误在于您正在为音频播放器创建功能范围实例。它会在执行后立即释放，这就是它不播放的原因。为 audioPlayer 对象创建一个 class 变量并执行相同的操作。它肯定会起作用。此外，目前您的 URL 来自服务器，因此请等待几秒钟以接收足够的缓冲区数据来播放。

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