IOS 8，开始播放声音的背景下，闹钟应用程序时 [英] iOs 8, start playing sound when in the background, alarm clock app

问题描述

我知道有上SOF很多问题，但这是最新之一。关键是，我试图创建和报警的应用程序，我知道一个事实，即有报警应用程式在那里，完美的作品（在某种程度上），即使应用程序没有运行，并在后台。

I know there are many questions on SOF, but this is the "newest" one. The thing is, I'm trying to create and alarm app, and I know for a fact that there are alarm apps out there that works perfectly ( somehow ), even if the app is not running and is in the background.

我的问题是：你是怎么开始播放声音的在您的应用程序已经在后台？

My question is: how do you start playing sound after your app is already in the background ??

UILocalNotification是伟大的，但你只能得到应用程序：（_：didReceiveLocalNotification：）所需的背景模式：应用程序播放音频或数据流通过AirPlay的音频/视频的info.plist 已设置。一旦音乐开始播放，它让玩即使我去后台。

UILocalNotification is great, but you'll only get application:(_:didReceiveLocalNotification:) after the user has already clicked on your notification, so playing sound using AVAudioPlayer didn't work, i want to play sound regardless weather the user clicks on it or doesn't. Of course with Required background modes: App plays audio or streams audio/video using AirPlay in info.plist already set. Once the music starts playing, it keeps playing even if i go to the background.

我不希望使用UILocalNotificaation声音怎么把它限制在30秒，只有能够发挥被捆绑与应用程序的声音。

I don't want to use UILocalNotificaation sound coz it's limited to 30 secs and only the able to play the sounds that are bundled with the application.

任何见解？想法？

样code：

    var notif = UILocalNotification()
    notif.fireDate = self.datePicker.date
    notif.alertBody = "test"
    UIApplication.sharedApplication().scheduleLocalNotification(notif)

当用户选择并报警，并点击保存上述code被调用。

the above code gets called when the user selects and alarm and clicks save.

和这里发生的事情在AppDelegate中：

and here's what's happening in AppDelegate:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
    NSLog("launched")
    application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: UIUserNotificationType.Sound | UIUserNotificationType.Alert |
        UIUserNotificationType.Badge, categories: nil
        ))
    AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: nil)
    AVAudioSession.sharedInstance().setActive(true, error: nil)

    self.sound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("sound", ofType: "caf"))
    self.audioPlayer = AVAudioPlayer(contentsOfURL: sound, error: nil)

    return true
}

func application(application: UIApplication!, didReceiveLocalNotification notification: UILocalNotification!){
    audioPlayer.play()
    NSLog("received local notif")


}

您需要抱持着强烈的参考 AVAudioPlayer 顺便说一句，这样就不会得到释放，而 audioplayer.play（）不会做任何事情...

You need to hold a strong reference to the AVAudioPlayer btw, so it won't get released, and the audioplayer.play() won't do anything...

推荐答案

最后，我设法用的NSTimer做。

Finally, I managed to do it with NSTimer.

func applicationWillResignActive(application: UIApplication) {
    var timer = NSTimer(fireDate: NSDate(timeIntervalSinceNow: 20), interval: 60.0, target: self, selector: Selector("playAlarm"), userInfo: nil, repeats: false)
    NSRunLoop.currentRunLoop().addTimer(timer, forMode: NSDefaultRunLoopMode)
}
func playAlarm() {
    self.sound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("sound", ofType: "caf"))
    self.audioPlayer = AVAudioPlayer(contentsOfURL: sound, error: nil)
    audioPlayer.play()
}

和其他地方一个UILocalNotification已同步与此计时器，一个良好的用户体验。

and somewhere else a UILocalNotification is synced with this timer, for a good user experience.

虽然我不知道这是否会通过苹果，但我看不出有任何理由为什么它不会：\\

Although I'm not sure if this would go through apple, but I don't see any reason why it wouldn't :\

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