嗨，我是 swift 和 ios 开发的新手。我的代码一直在工作，直到我更新到 Swift 2.0，我使用了 swift 迁移工具，但我仍然不知道如何排序和修复我的代码。请帮忙！
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()
}
swift 2.0 更新功能：
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)
}
}
这样使用它：
playBackgroundMusic("yourFileName.mp3")
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