为什么这个MP3文件不stream式传输

我试图用`avPlayer`播放这个mp3文件,但是当我尝试播放时,我只是沉默。 我没有收到任何错误,这里是我的代码

@IBAction func Test(sender: AnyObject) { println("Preparing to play") let urlString = "http://www.mp3juices.cc/get/3/194751031/x_ambassadors_-_renegades/" let url = NSURL(string: urlString) var avPlayer = AVPlayer(URL: url) avPlayer.play() } 

 import AVFoundation class ViewController: UIViewController { // declare your avPlayer here var avPlayer: AVPlayer! override func viewDidLoad() { super.viewDidLoad() } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } @IBAction func test(sender: AnyObject) { println("Preparing to play") let url = NSURL(string: "http://www.mp3juices.cc/get/3/194751031/x_ambassadors_-_renegades/") avPlayer = AVPlayer(URL: url) avPlayer.play() } }