ios - Xcode swift - 后台模式 - 锁定时 AVPlayer 中的音频

Question

我已经设置了 AVPlayer，但当手机锁定或在主屏幕上时，我似乎无法让视频音频继续播放。我已经编辑了 info.plist 并启用了音频背景模式，但我认为需要添加一些代码。请你帮我一下。谢谢

这是我的代码:

import UIKit
import AVFoundation
import AVKit

class ViewController: UIViewController {

    @IBAction func WarmUp(sender: UIButton)
    {
        WarmUpVideo()
    }

    func WarmUpVideo()
    {
        let filePath = NSBundle.mainBundle().pathForResource("132", ofType: "MOV")
        let videoURL = NSURL(fileURLWithPath: filePath!)

        let player = AVPlayer(URL: videoURL)
        let playerViewController = AVPlayerViewController()

        playerViewController.player = player

        self.presentViewController(playerViewController, animated: true) { () -> Void in playerViewController.player!.play()
        }

    }

    func playExternalVideo()
    {

}


    @IBAction func CoolDown(sender: UIButton)
    {
        CoolDownVideo()
    }

    func CoolDownVideo()
    {
        let filePath = NSBundle.mainBundle().pathForResource("132", ofType: "mp4")
        let videoURL = NSURL(fileURLWithPath: filePath!)

        let player = AVPlayer(URL: videoURL)
        let playerViewController = AVPlayerViewController()

        playerViewController.player = player

        self.presentViewController(playerViewController, animated: true) { () -> Void in playerViewController.player!.play()
        }

    }

}

Answer 1

我认为您缺少以下代码:

do {
    try AVAudioSession.sharedInstance()
                          .setCategory(AVAudioSession.Category.playback)
    print("AVAudioSession Category Playback OK")
    do {
        try AVAudioSession.sharedInstance().setActive(true)
        print("AVAudioSession is Active")
    } catch let error as NSError {
        print(error.localizedDescription)
    }
} catch let error as NSError {
    print(error.localizedDescription)
}

将其添加到您的 viewDidLoad 中。

关键代码行的典型 2019 语法:

try AVAudioSession.sharedInstance().setCategory(.playback)

在某些情况下，您可能需要:

try AVAudioSession.sharedInstance().setCategory(.playback, options: .mixWithOthers)

<小时/>

您必须在 plist 中添加此一个项(仅限一项，请注意旧示例)；

<key>UIBackgroundModes</key>
<array>
    <string>audio</string>
</array>

这是:

注意:几年前您还必须添加UIApplicationExitsOnSuspend - 今天不要添加它。