ios - 如何在 Swift 中使用按钮和 if/else 停止背景音乐？

Question

在我的游戏中，我向 GameScene 添加了一个按钮并播放了音乐:

let url = NSBundle.mainBundle().URLForResource("Happy Background Music", withExtension: "mp3")
let bgMusic = AVAudioPlayer(contentsOfURL: url, error: nil)

@IBAction func SoundOnOff(sender: UIButton) {
    bgMusic.numberOfLoops = -1
    bgMusic.play()
}

并且播放了音乐，但我想添加一个如果按下按钮时音乐将停止。如果我应该写呢？

Answer 1

用这个改变你的代码，

 let url = NSBundle.mainBundle().URLForResource("Happy Background Music", withExtension: "mp3")

    do{
        let bgMusic = try AVAudioPlayer(contentsOfURL: url!)
    }catch{
        print(error)
    }


@IBAction func SoundOnOff(sender: UIButton) {

if bgMusic.playing {
        bgMusic.stop()
    } else {
        self.bgMusic.play()
    }
}

编辑:描述

playing- Property
-A Boolean value that indicates whether the audio player is playing (true) or not (false). (read-only)