Playing sound in Apple Watchkit

问题:

I'm trying to play a sound through the watchkit extension using WKAudioFilePlayer however no sound gets played. I'm using the haptic feedback code as a sort of debug to be sure it executes it (which it does). As a side note, mute is not on and the filename is correct.

NSURL *falcon = [NSURL fileURLWithPath:[[NSBundle mainBundle]
                                        pathForResource:@"falcon"
                                        ofType:@"mp3"]];
WKAudioFileAsset *asset = [WKAudioFileAsset assetWithURL:falcon];
WKAudioFilePlayerItem *sound = [WKAudioFilePlayerItem playerItemWithAsset:asset];
audioPlayer = [WKAudioFilePlayer playerWithPlayerItem:sound];


[audioPlayer play];

WKInterfaceDevice *device = [WKInterfaceDevice currentDevice];
[device playHaptic:WKHapticTypeClick];

回答1:

I implemented as follows and it worked fine. (Sorry, it's Swift)

1) Define a property for the player object

var player: WKAudioFilePlayer!

2) Setup the asset and player when it's awaking

override func awakeWithContext(context: AnyObject?) {
    super.awakeWithContext(context)

    let filePath = NSBundle.mainBundle().pathForResource("se_tap", ofType: "m4a")!
    let fileUrl = NSURL.fileURLWithPath(filePath)
    let asset = WKAudioFileAsset(URL: fileUrl)
    let playerItem = WKAudioFilePlayerItem(asset: asset)
    player = WKAudioFilePlayer(playerItem: playerItem)
}

3) Play if the player is ready to play.

@IBAction func playBtnTapped() {
    switch player.status {
    case .ReadyToPlay:
        player.play()
    case .Failed:
        print("failed")
    case .Unknown:
        print("unknown")
    }
}

In addition, it needed to connect a Bluetooth Headset with watch.