如何从Swift中的AVAudioPlayer获取锁定屏幕/控制中心的音频控件 [英] How Do I Get Audio Controls on Lock Screen/Control Center from AVAudioPlayer in Swift

问题描述

iOS开发新手，所以这里。我有一个播放音频的应用程序 - 我正在使用 AVAudioPlayer 在应用程序的资产中按名称加载单个文件。我不想查询用户的库，只查询提供的文件。效果很好，但是，我希望用户能够从锁定屏幕暂停和调整音量。

New to iOS development, so here goes. I have an app that is playing audio - I'm using AVAudioPlayer to load single files by name in the app's assets. I don't want to query the user's library, only the files provided. Works great, but, I want the user to be able to pause and adjust volume from the lock screen.

func initAudioPlayer(file:String, type:String){
    let path = NSBundle.mainBundle().pathForResource(file, ofType: type)!
    let url = NSURL(fileURLWithPath: path)
    let audioShouldPlay = audioPlaying()
    do{
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
        try AVAudioSession.sharedInstance().setActive(true)
        let audioPlayer:AVAudioPlayer = try AVAudioPlayer(contentsOfURL: url)
        audioPlayer.volume = slider.value
        audioPlayer.numberOfLoops = -1
        audioPlayer.prepareToPlay()
        if(audioShouldPlay){
            audioPlayer.play()
//                let mpic = MPNowPlayingInfoCenter.defaultCenter()
//                mpic.nowPlayingInfo = [MPMediaItemPropertyTitle:"title", MPMediaItemPropertyArtist:"artist"]
        }
    }
    catch{}
}

我使用 AVAudioSession 和 MPNowPlayingInfoCenter 只是通过阅读其他相关实验帖子。

My use of AVAudioSession and MPNowPlayingInfoCenter were just experiments from reading other related posts.

启用后台模式d我的应用程序的plist文件中的音频

Background mode is enabled for audio in my app's plist file

推荐答案

您需要调用beginReceivingRemoteControlEvents（），否则它将无法在实际设备上运行。

You need to invoke beginReceivingRemoteControlEvents() otherwise it will not work on the actual device.

Swift 3.1

UIApplication.shared.beginReceivingRemoteControlEvents()

如果要为MPRemoteCommandCenter指定自定义操作：

If you would like to specify custom actions for the MPRemoteCommandCenter:

let commandCenter = MPRemoteCommandCenter.shared()
commandCenter.nextTrackCommand.isEnabled = true
commandCenter.nextTrackCommand.addTarget(self, action:#selector(nextTrackCommandSelector))

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