小编luc*_*mbd的帖子

首先让我说我对编程很新.我要做的是添加一个按钮,当按下该按钮播放音乐时,再次按下时按钮音乐停止.理想情况下,当第三次按下按钮时,音乐将重置.在尝试实现这一目标的同时,我收到错误消息"表达式解析为未使用的函数",因为我很新,我在网上找到的所有帮助对我都没有任何意义.

import UIKit
import AVFoundation

class ViewController: UIViewController {
    @IBOutlet weak var janitor: UIImageView!
    var pianoSound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("C", ofType: "m4a")!)
    var audioPlayer = AVAudioPlayer()

    override func viewDidLoad() {
        super.viewDidLoad()

        audioPlayer = AVAudioPlayer(contentsOfURL: pianoSound, error: nil)
        audioPlayer.prepareToPlay()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }


        @IBAction func PianoC(sender: AnyObject) {

        audioPlayer.play()

            if audioPlayer.playing { audioPlayer.stop} else {  audioPlayer.play}
}
}