如何在Swift 2 / AVPlayer中恢复背景音频？
我正在学习Swift作为我的第一个编程语言。
我已经挣扎了好几个小时，以便在中断后恢复后台音频播放 （例如呼叫）
应该发生什么：
真的很感谢任何帮助！ 谢谢
笔记：
码：
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")
}
}
终于明白了！
解决方案：通过将setCategory行更改为以下内容添加可混合选项：
AVAudioSession.sharedInstance（）。setCategory（AVAudioSessionCategoryPlayback，withOptions：AVAudioSessionCategoryOptions.MixWithOthers）
我写了这样的代码，并成功地恢复了通话结束后的音频。 我建立在Xcode 6.4上，并在我的iPhone 4S上运行该应用程序。
var player: AVQueuePlayer! = nil
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewDidAppear(animated: Bool)
{
super.viewDidAppear(true)
var song = AVPlayerItem(URL: NSBundle.mainBundle().URLForResource("AlmostAYearAgo", withExtension: "mp3")!)
player = AVQueuePlayer(items: [song])
let theSession = AVAudioSession.sharedInstance()
NSNotificationCenter.defaultCenter().addObserver(self, selector: "playInterrupt:", name: AVAudioSessionInterruptionNotification, object: theSession)
player.play()
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
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")
}
对于我结束中断后重新加载播放器解决问题：
func interruptionNotification(_ notification: Notification) {
guard let type = notification.userInfo?[AVAudioSessionInterruptionTypeKey] as? UInt,
let interruption = AVAudioSessionInterruptionType(rawValue: type) else {
return
}
if interruption == .ended && playerWasPlayingBeforeInterruption {
player.replaceCurrentItem(with: AVPlayerItem(url: radioStation.url))
play()
}
}