如何在swift 2.2中使用Watch Connectivity在AVPlayerViewController中播放电影?

时间:2016-08-14 12:25:13

标签: swift watch-os-2 watchconnectivity

如何在AVPlayerViewController中播放此视频,并更改从我的Watch发送的Watch Connectivity命令触发的音量(使用swift 2.2)。当我点击手表上的开始/停止时,我得不到任何回复。我的控制台或崩溃没有错误。

 import UIKit
 import AVKit
import AVFoundation
import WatchConnectivity

@UIApplicationMain
 class AppDelegate: UIResponder, UIApplicationDelegate, WCSessionDelegate {

  var window: UIWindow?

func session(session: WCSession, didReceiveMessage message: [String : AnyObject], replyHandler: ([String : AnyObject]) -> Void) {

    var replyValues = Dictionary<String, AnyObject>()

    let viewController = self.window!.rootViewController
        as! AVPlayerViewController
    var player = AVPlayer()
    let url = "https://example.site/sites/default/files/videos/original/video1bunny_0.mp4"
    let playerItem = AVPlayerItem( URL:NSURL( string:url )! )
    player = AVPlayer(playerItem:playerItem)
    player.rate = 1.0;

    switch message["command"] as! String {
    case "start" :
        player.play()
        replyValues["status"] = "Playing"
    case "stop" :
        player.pause()
        replyValues["status"] = "Stopped"
    case "volume" :
        let level = message["level"] as! Float
        //player.adjustVolume(level)
        replyValues["status"] = "Vol = \(level)"
    default:
        break
    }
    replyHandler(replyValues)
}

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool {

    if (WCSession.isSupported()) {
        let session = WCSession.defaultSession()
        session.delegate = self
        session.activateSession()

        if session.paired != true {
            print("Apple Watch is not paired")
        }

        if session.watchAppInstalled != true {
            print("WatchKit app is not installed")
        }
    } else {
        print("WatchConnectivity is not supported on this device")
    }

    return true

} }

我正在尝试调整此代码(在我的ViewController.swift中),该代码在音频播放器中成功播放了mp3。 (我已正确设置了手表上的所有IBActions等。)

    class ViewController: UIViewController {

var audioSession: AVAudioSession = AVAudioSession.sharedInstance()
var audioPlayer: AVAudioPlayer?

@IBOutlet weak var volumeControl: UISlider!

override func viewDidLoad() {
    super.viewDidLoad()

    var url: NSURL?

    do {
        try audioSession.setCategory(AVAudioSessionCategoryPlayback)
        url = NSURL.fileURLWithPath(
            NSBundle.mainBundle().pathForResource("vivaldi",
                ofType: "mp3")!)
    } catch {
        print("AudioSession error")
    }

    do {
        try audioPlayer = AVAudioPlayer(contentsOfURL: url!,
                            fileTypeHint: nil)
        audioPlayer?.prepareToPlay()
        audioPlayer?.volume = 0.1
    } catch let error as NSError {
        print("Error: \(error.description)")
    }
}

1 个答案:

答案 0 :(得分:2)

工作示例

在成功播放MP3的第二个示例中,您已为AVPlayer设置了视图控制器属性,并将新的音频播放器分配给该属性。视图控制器保留音频播放器,即使在viewDidLoad代码退出后也会播放:

class ViewController: UIViewController {
    var audioPlayer: AVAudioPlayer?

失败的例子

然而,在您尝试使用的第一个示例中,只要该代码块退出,您就会使用超出范围的局部变量:

func session(session: WCSession, didReceiveMessage message: [String : AnyObject], replyHandler: ([String : AnyObject]) -> Void) {
    var player = AVPlayer()

音频播放器已经发布,不再存在。

您应该保留音频播放器的该实例,就像您在工作示例中所做的那样。