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不完全确定我在这里做错了什么。第一次使用Swift。试着播放一个简单的音频文件。

// Imports I need
import UIKit
import AVFoundation

class ViewController: UIViewController {

    var isPlaying = false // variable to control playback selection, used in togglePlayPause

    var player = AVPlayer()

    // A button I have in the center of the View Controller
    @IBOutlet weak var PlayButton: UIButton!

    // A method that toggles playback when that button is hit
    // This SEEMS to work. Everything except audio playing and pausing seems to be working
    // when I debug
    @IBAction func togglePlayPause(sender: AnyObject) {
        if (isPlaying) {
            player.pause()
            PlayButton.setTitle("Play", forState: UIControlState.Normal)    // This works
            print("Pause")                                                  // and this
        } else {
            player.play()
            PlayButton.setTitle("Pause", forState: UIControlState.Normal)   // This works
            print("Play")                                                   // and so does this
        }
        isPlaying = !isPlaying          // I do end up swapping each time this runs. I have
                                        // Breakpoints set up on the first statements of each
                                        // and I hit the opposite one each time I press the button
                                        // Oh, and the text on the button changes accordingly
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        //let url = "http://192.99.131.205:8000/stream.mp3" // This is a Shoutcast stream.
                                                            // Not using it for now
        let url = "http://www.nasa.gov/mp3/640149main_Computers%20are%20in%20Control.mp3"
                                                            // Normal MP3 file from the web
        player = AVPlayer(URL: (NSURL(string: url))!)       // This SHOULD make an AVPlayer
                                                            // that connects to said URL and
        player.play()                                       // this should play it
        isPlaying = true                                    // Keep track
        PlayButton.setTitle("Pause", forState: UIControlState.Normal) // Set button text
        player.volume = 1                                   // FORCE VOLUME FULL JUST IN CASE
    }

    // I honestly could remove this
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

那么，有什么不对？好吧，至少在我的iPhone 5上运行8.3，我的屏幕左上角有一个网络加载指示器，但没有音频。它的行为就像是在尝试播放，但我的设备没有声音。

我真的不知道为什么这不起作用。我已经看到其他例子有效，他们就是这样。我可以说，Shoutcast / Icecast流需要更多的工作，但这只是一个非常疯狂的MP3文件。

我有AVFoundation和CFNetwork编译我的应用程序。我不认为我需要CFNetwork，但是哦。哦。

我定位8.3，运行最新的xcode（昨天刚刚下载），并且正在建立在10.11.4的VM上。我会更新我的iPhone，但我现在不能。