Swift 按钮不能播放声音。我已经包括了wav文件

按钮没有播放声音？
如何使编码更加正确

import UIKit
import AVFoundation

//var  audioPlayer: AVAudioPlayer!
class ViewController: UIViewController {

    var  audioPlayer: AVAudioPlayer!


    override func viewDidLoad() {
      super.viewDidLoad()

        let path =  Bundle.main.path(forResource: "BtnSon", ofType: " WAV")
        let soundURL = URL(fileURLWithPath: (path)!)

        do {
            try audioPlayer = AVAudioPlayer(contentsOf: soundURL)
          audioPlayer.prepareToPlay()
        } catch let err as NSError {
            print(err.debugDescription)
        }
    }

    @IBAction  func numberPressed(Sender: UIButton){
          playSound()
    }

    func playSound(){
        if audioPlayer.isPlaying {
          audioPlayer.stop()
        }

        audioPlayer.play()
    }
}

试试这个：

import UIKit
import UIKit
import AVFoundation

//var  audioPlayer: AVAudioPlayer!
class ViewController: UIViewController {

    var  audioPlayer: AVAudioPlayer!

    override func viewDidLoad() {
        super.viewDidLoad()
        //--------------------------------------------------------> No space before _W
        guard let soundURL =  Bundle.main.url(forResource: "BtnSon", withExtension: "WAV") else {
            fatalError("You have failed to add 'BtnSon.WAV' in your app bundle.")
        }
        do {
            try audioPlayer = AVAudioPlayer(contentsOf: soundURL)
            audioPlayer.prepareToPlay()
        } catch let err as NSError {
            print(err.debugDescription)
        }
    }

    @IBAction func numberPressed(_ sender: UIButton){
        playSound()
    }

    func playSound(){
        if audioPlayer.isPlaying {
            audioPlayer.stop()
        }
        audioPlayer.play()
    }
}

---

而且要小心，iOS的文件系统是区分大小写的。

。它显示了一个错误：致命错误：在展开您正在使用的“wav”类型的可选值（lldb）时意外地发现了nil，请尝试不带前导空格的“wav”