如何在后台模式下继续播放音频 [英] How to continue audio playback in background mode

问题描述

我有一个UIWebView，可以在我的视图控制器中播放视频片段。当我退出应用程序时，音频将停止播放，尽管我可以在控制中心按播放以再次继续播放。要做到这一点，我在我的AppDelegate.swift中使用以下代码。

I have a UIWebView that plays video clips in my view controller. When I exit the app, the audio will stop playing, although I can press play in the control center to continue it again. To do that I'm using the following code in my AppDelegate.swift.

当应用程序进入后台时，我希望音频自动开始播放。如何启用MPMusicPlayerController / AVAudioPlayer（我真的不确定它是什么）继续播放，这样用户就不必手动按播放了？

When the app enters the background, I'd like the audio to start playing automatically. How can I enable the MPMusicPlayerController/AVAudioPlayer (I'm really not sure which it is) to continue playing so the user doesn't have to manually press play?

I还在我的目标设置中的背景模式下选中音频和Airplay，并将所需背景模式设置为App播放音频或使用AirPlay播放音频/视频。

I also have "Audio and Airplay" checked under Background Modes in my target settings, and Required Background Modes set to "App plays audio or streams audio/video using AirPlay".

var error: NSError?
var success = AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: &error)
if !success {
     NSLog("Failed to set audio session category.  Error: \(error)")
}

---

更新：我正在 appDel 中创建自定义视图以容纳视频迷你播放器。这就是我创造它的方式。 CustomWindow 是一个自定义类 UIWindow 我在这里添加一个迷你播放器到视图层次结构的顶部。在这段代码中，我在创建 UIWebView 之前调用该方法吗？

---

UPDATE: I'm creating a custom view in my appDel to accommodate a video mini player. Here's how I'm creating it. CustomWindow is a custom class of UIWindow where I'm adding a mini player to the top of the view hierarchy. In this code, am I calling that method before creating the UIWebView?

class AppDelegate: UIResponder, UIApplicationDelegate {

    let myWind = CustomWindow(frame:UIScreen.mainScreen().bounds)
    var window: UIWindow? {
        set {

        }
        get {
            return myWind
        }
    }

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        var error: NSError?
        var success = AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: &error)
        if success {
            AVAudioSession.sharedInstance().setActive(true, error: nil)
            UIApplication.sharedApplication().beginReceivingRemoteControlEvents()
        } else {
            NSLog("Failed to set audio session category.  Error: \(error)")
        }

        myWind.showOrHidePopupWindow()
}

推荐答案

尝试使用以下代码更新代码：

Try to update you code with this:

var error: NSError?
var success = AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: &error)
if success {
    AVAudioSession.sharedInstance().setActive(true, error: nil)
    UIApplication.sharedApplication().beginReceivingRemoteControlEvents() 
} else {
    NSLog("Failed to set audio session category.  Error: \(error)")
}

重要提示：

1. 不要使用模拟器进行测试。后台播放在模拟器中不起作用;


2. 在创建 UIWebView 实例之前调用上面的代码。

1. Don't use simulator for tests. Background playback doesn't work in the Simulator;
2. Call above code before creating UIWebView instance.

来源： 1 ， 2 。

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