在多个场景中使用AVAudioPlayer Swift并能够调节音量 [英] Using AVAudioPlayer across multiple scenes Swift and be able to adjust volume

问题描述

您好，我想知道是否有一种方法可以在多个场景中使用AVAudioPlayer并更改音量.我目前将其放置在我的gameViewController中，后者是我所有应用程序场景的控制器:

Hi I was wondering if there was a way to use an AVAudioPlayer across multiple scenes and change the volume. I'm currently placing it in my gameViewController which is the controller for all of my application's scenes:

override func viewDidAppear(animated: Bool) {
    let backgroundMusicURL = NSBundle.mainBundle().URLForResource("tempMusic.mp3", withExtension: nil)
    backgroundMusicPlayer = AVAudioPlayer(contentsOfURL: backgroundMusicURL, error:nil)
    backgroundMusicPlayer.numberOfLoops = -1
    backgroundMusicPlayer.prepareToPlay();
    backgroundMusicPlayer.play();
}

这可以按预期工作，但是我无法控制场景本身的音量.

This works as intended, but I am unable to control its volume in the scenes themselves.

那么，有没有一种方法可以播放背景音乐，使其在多个场景中流畅运行，并且在这些场景中仍可以调节音量?

So, is there a way to have background music playing so that it runs smoothly throughout multiple scenes and the volume is still adjustable from within these scenes?

推荐答案

好吧，我可以使用Matt提供的链接来使它正常工作(因此，该帖子的未来读者会对他的评论投赞成票).

Okay I got it to work using the link presented by Matt (so future viewers of this post up vote his comment).

if let vc = UIApplication.sharedApplication().keyWindow?.rootViewController as? GameViewController{
   vc.setMusicVolume(Float(hexData.musicVolume)/100.0);
}

我现在从场景本身内部访问rootViewController.为了预防起见，我将其放在if语句中.

I now access the rootViewController from within the scenes themselves. I put it inside an if statement just as a precaution.

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