致命错误:在Swift 2中使用AudioPlayer时,在展开Optional值时意外发现nil

Question

嗨我正在尝试使用swift 2中的以下代码播放音乐文件.基本上我只是将名为f.mp3的音频文件拖到asses文件夹中,我的代码中断了以下消息:意外发现nil同时展开一个可选值.我需要把我的mp3文件放在哪里,以便IOS可以找到它.谢谢

var audioPlayer: AVAudioPlayer! = nil
func playMyFile() {

    let path = NSBundle.mainBundle().pathForResource("f", ofType: "mp3")
    let fileURL = NSURL(fileURLWithPath: path)

    do {
     try audioPlayer =  AVAudioPlayer(contentsOfURL: fileURL)
    } catch {
        print("error")
    }
    audioPlayer.prepareToPlay()
    audioPlayer.delegate = self
    audioPlayer.play()

}

Answer 1

您的代码在我的项目中正常运行,这是我的完整代码:

import UIKit
import AVFoundation

class ViewController: UIViewController {

    var audioPlayer: AVAudioPlayer! = nil

    override func viewDidLoad() {
        super.viewDidLoad()
        playMyFile()
    }

    func playMyFile() {

        let path = NSBundle.mainBundle().pathForResource("f", ofType: "mp3")
        let fileURL = NSURL(fileURLWithPath: path!)

        do {
            try audioPlayer =  AVAudioPlayer(contentsOfURL: fileURL)
        } catch {
            print("error")
        }
        audioPlayer.prepareToPlay()
        audioPlayer.play()
    }
}

确保将音频添加到Copy Bundle Resources中,如下所示:

如果没有添加,请以这种方式添加:

查看此示例以获取更多信息.