ios – Swift错误::调用可以抛出,但没有标记为’try’并且错误未被处理

参见英文答案 > Playing Audio in Xcode7                                    2个
我刚刚开始学习Swift,我正在尝试在我的代码中添加一首歌来播放它,当我按下按钮但错误显示出来.如何@L_607_5@这个错误？

var buttonAudioPlayer = AVAudioPlayer()

@IBACtion func btnWarning(sender: UIButton) {
    play()
}

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

func play() {
    let buttonAudioURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathFor@R_607_5550@e("warning",ofType: "mp3")!)
    let one = 1

    if one == 1 {
        buttonAudioPlayer = AVAudioPlayer(contentsOfURL: buttonAudioURL) //getTing the error in this line
        buttonAudioPlayer.prepareToPlay()
        buttonAudioPlayer.play()
    }
}

init(contentsOfURL url: NSURL) throws

do {
    let buttonAudioPlayer = try AVAudioPlayer(contentsOfURL: buttonAudioURL)
} catch let error {
    print("error occured \(error)")
}

let buttonAudioPlayer = try! AVAudioPlayer(contentsOfURL: buttonAudioURL)