AVPlayer没有播放尽管有正确的URL

Question

我需要代码的帮助，因为我不知道为什么我的AVPlayer不能播放音频。以下是我的职责：

​

@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()
}

​

这里的名称是：

​

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

​

下面是输出传递的字符串的控制台的结果：

​

[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

​

它似乎在工作，但音频没有播放。任何帮助或解释都将不胜感激！

Answer 1

我检查了您的代码并发现了这样的模式：

• 如果我在audioPlayer之前定义和初始化viewDidLoad -那么audioPlayer在100%的情况下工作(我使用这音频)
• 如果我像您一样定义和初始化audioPlayer (在pausePlayAudio) --有时起作用，有时不起作用。

请查查这个：

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

您的错误是您正在为音频播放器创建一个功能范围实例。它将在执行后立即释放，这就是为什么它不播放的原因。为audioPlayer对象创建一个类变量，并执行相同的操作。一定会成功的。另外，当前您的URL来自服务器，所以请等待几秒钟才能收到足够的缓冲区数据来播放。