如何用swift 2.0播放背景音乐？ [英] How to play background music with swift 2.0?

问题描述

我是swift和ios开发的新手。我的代码一直在运行，直到我更新到Swift 2.0，我使用了swift迁移工具，但我仍然无法弄清楚如何对代码进行排序和修复。请帮助！

HI I am new to swift and ios development. My code was working up until I've updated to Swift 2.0, I've used swift migrating tool, but I still can't figure out how to sort and fix my code. Please help!

import AVFoundation

var backgroundMusicP: AVAudioPlayer!

func playBackgroundMusic(filename: String) {
    let url = NSBundle.mainBundle().URLForResource(
        filename, withExtension: nil)
    if (url == nil) {
        print("Could not find file: \(filename)")
        return
    }

    var error: NSError?

    do {

        backgroundMusicP = try AVAudioPlayer(contentsOfURL: url!)
    } catch {

        backgroundMusicP == nil
    }
    if backgroundMusicP == nil {
        print("Could not create audio player: \(error)")
        return
    }

    backgroundMusicP.numberOfLoops = -1
    backgroundMusicP.prepareToPlay()
    backgroundMusicP.play()
}

推荐答案

swift 2.0的更新功能：

Updated function for swift 2.0:

import AVFoundation

var backgroundMusicPlayer = AVAudioPlayer()

func playBackgroundMusic(filename: String) {
    let url = NSBundle.mainBundle().URLForResource(filename, withExtension: nil)
    guard let newURL = url else {
        print("Could not find file: \(filename)")
        return
    }
    do {
        backgroundMusicPlayer = try AVAudioPlayer(contentsOfURL: newURL)
        backgroundMusicPlayer.numberOfLoops = -1
        backgroundMusicPlayer.prepareToPlay()
        backgroundMusicPlayer.play()
    } catch let error as NSError {
        print(error.description)
    }
}

以这种方式使用：

playBackgroundMusic("yourFileName.mp3")

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