如何在Swift 2 / AVPlayer中恢复背景音频？ [英] How to resume background audio in Swift 2 / AVPlayer?

问题描述

我正在学习Swift作为我的第一门编程语言。

I am learning Swift as my first programming language.

我在中断后努力了很长时间恢复背景音频播放例如致电）

I've struggled for many hours to resume background audio playback after interruption (eg call)

会发生什么：

1. 当应用程序转到后台时，音频会继续播放（正常）


2. 当被通话中断时，获取中断通知开始
   （正常）


3. 当通话结束时，获取中断通知
   结束（正常）


4. 继续播放音频（不起作用 - 听不见）

1. Audio keeps playing when app goes to background (works)
2. When interrupted by a call, get the notification for interruption began (works)
3. When call ends, get the notification for interruption ends (works)
4. Resume playing the audio (does NOT work - hear nothing)

非常感谢任何帮助！谢谢

Really appreciate any help! Thanks

注意：

1. 该应用是


2. 我已经尝试过没有时间延迟恢复播放 - 两种方式都没有工作

$ b $注册后台音频并在中断前播放正常b

代码：

Code:

import UIKit
import AVFoundation

var player: AVQueuePlayer!

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        do {
            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
            try AVAudioSession.sharedInstance().setActive(true, withOptions: .NotifyOthersOnDeactivation)
        } catch { }
        let songNames = ["music"]
        let songs = songNames.map { AVPlayerItem(URL:
            NSBundle.mainBundle().URLForResource($0, withExtension: "mp3")!) }
        player = AVQueuePlayer(items: songs)

        let theSession = AVAudioSession.sharedInstance()
        NSNotificationCenter.defaultCenter().addObserver(self,
            selector:"playInterrupt:",
            name:AVAudioSessionInterruptionNotification,
            object: theSession)

        player.play()
    }

    func playInterrupt(notification: NSNotification) {

        if notification.name == AVAudioSessionInterruptionNotification
            && notification.userInfo != nil {

            var info = notification.userInfo!
            var intValue: UInt = 0
            (info[AVAudioSessionInterruptionTypeKey] as! NSValue).getValue(&intValue)
            if let type = AVAudioSessionInterruptionType(rawValue: intValue) {
                switch type {
                case .Began:
                    print("aaaaarrrrgggg you stole me")
                    player.pause()

                case .Ended:
                    let timer = NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: "resumeNow:", userInfo: nil, repeats: false)
                }
            }
        }
    }
    func resumeNow(timer : NSTimer) {
        player.play()
        print("attempted restart")
    }
}

推荐答案

终于搞定了！

解决方案：添加了通过将setCategory行更改为可混合选项：

Solution: added the mixable option by changing the setCategory line to be:

AVAudioSession.sharedInstance（）。 setCategory（AVAudioSessionCategoryPlayback，withOptions：AVAudioSessionCategoryOptions.MixWithOthers）

AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, withOptions: AVAudioSessionCategoryOptions.MixWithOthers )

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