如何获取 AvPlayer 持续时间 - 斯威夫特

Question

如何让AvPlayer像AvAudioPlayer一样工作。我的意思是，我似乎根本无法获得工作时间。以下是我需要转换为 AvPlayer 的内容：

import UIKit
import AVKit
import AVFoundation

class ModalViewController: UIViewController {
    var audioPlayer = AVAudioPlayer()
    let varSend = VarSend.sharedInstance
    var timer:NSTimer!
    var toggleState = 2

    @IBOutlet weak var slider: UISlider!
    @IBOutlet weak var sermonImage: UIImageView!
    @IBOutlet weak var sermont: UILabel!
    @IBOutlet weak var sermond: UILabel!
    @IBOutlet weak var sermonE: UILabel!
    @IBOutlet weak var sermonL: UILabel!
    @IBOutlet weak var play: UIButton!
    @IBOutlet var layer: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        let url = varSend.url
        print("Setting up.")

        do {
           let data1 =  NSData(contentsOfURL: NSURL(string:url)!)
            audioPlayer = try AVAudioPlayer(data: data1!)
            audioPlayer.prepareToPlay()
            audioPlayer.volume = 1.0
            audioPlayer.play()
        } catch {
            print("Error getting the audio file")
        }

        slider.maximumValue = Float(audioPlayer.duration)
        timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("updateSlider"), userInfo: nil, repeats: true)
        slider.setThumbImage(UIImage(named: "circle"), forState: .Normal)
        slider.setThumbImage(UIImage(named: "circle"), forState: .Highlighted)

        let title = varSend.sermonName
        self.sermont.text = title
        let date = varSend.sermonDate
        self.sermond.text = date
        let image = varSend.sermonPic
        ImageLoader.sharedLoader.imageForUrl(image, completionHandler:{(image: UIImage?, url: String) in
            self.sermonImage.image = image!
        })
    }
    @IBAction func ChangeAudioTime(sender: AnyObject) {
        audioPlayer.stop()
        audioPlayer.currentTime = NSTimeInterval(slider.value)
        audioPlayer.prepareToPlay()
        audioPlayer.volume = 1.0
        audioPlayer.play()
    }

    func updateSlider() {
        slider.value = Float(audioPlayer.currentTime)
        let currentTime = Int(audioPlayer.currentTime)
        let minutes = currentTime / 60
        let seconds = currentTime - minutes * 60
        let con = Int(audioPlayer.duration)
        let currentItem = con - currentTime
        let minutesU = Int(currentItem / 60)
        let secondsU = Int(currentItem % 60)
        sermonE.text = NSString(format: "%02d:%02d", minutes,seconds) as String
        let timeLeft = NSString(format: "%02d:%02d", minutesU,secondsU) as String
        sermonL.text = "-(timeLeft)"
        if currentItem == 1 {
            //audioPlayer.pause()
            toggleState = 1
            print(toggleState)
            play.setImage(UIImage(named:"play.png"),forState:UIControlState.Normal)
        }
    }

    @IBAction func playPauseButton(sender: AnyObject) {
        let playBtn = sender as! UIButton
        if toggleState == 1 {
            audioPlayer.play()
            toggleState = 2
            playBtn.setImage(UIImage(named:"pause.png"),forState:UIControlState.Normal)
        } else {
            audioPlayer.pause()
            toggleState = 1
            playBtn.setImage(UIImage(named:"play.png"),forState:UIControlState.Normal)
        }
    }

    @IBAction func play(sender: AnyObject) {
        audioPlayer.play()
    }
    @IBAction func pause(sender: AnyObject) {
        audioPlayer.pause()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    @IBAction func close(sender: AnyObject) {
       self.dismissViewControllerAnimated(true, completion: nil)
        audioPlayer.stop()
    }
}

这是我已经尝试过的：

import UIKit
import Alamofire
import SwiftyJSON
import AVKit
import AVFoundation
import CoreMedia
class test: UIViewController {
    var audioPlayer:AVPlayer!
    var playerItem:AVPlayerItem!
   var timer:NSTimer!
    @IBOutlet weak var sermonE: UILabel!
    @IBOutlet weak var sermonL: UILabel!
    @IBOutlet weak var slider: UISlider!
    override func viewDidLoad() {
        super.viewDidLoad()

        //let playerItem:AVPlayerItem!;
        let playerURL = "example.com"
        let steamingURL:NSURL = NSURL(string:playerURL)!
        audioPlayer = AVPlayer(URL: steamingURL)

         timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("updateSlider"), userInfo: nil, repeats: true)



    }
     func updateSlider() {
        let item = audioPlayer?.currentItem
            let durationInSeconds = CMTimeGetSeconds(item!.duration)
        print(durationInSeconds)
    }
    @IBAction func ChangeAudioTime(sender: AnyObject) {
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func Play(sender: AnyObject) {
        audioPlayer.play()
    }
}

我已经搜索了几天，苹果的文档很难辨认。我什至尝试过

self.player.currentItem.asset.duration

来自： 如何从AVPlayer(不是AVAudioPlayer(获取持续时间？

任何帮助将不胜感激。

Answer 1

Swift 2.0

加载时间范围 数组包含包含 CMTimeRange 值的 NSValue 对象 指示播放器项具有媒体数据的时间范围 随时可用。返回的时间范围可能是不连续的。

所以我每 1 秒调用一次 myplayer.getCurrentTrackDuration，并注意到当我流式传输时，我在 3-4 秒后获得了正确的最终持续时间。

extension AVPlayer {
 //run this every 1 second of streaming (or use KVO)
 //In Http stream the duration it going to increase and probably finallize near to 7% of the total duration of the song 
 func getCurrentTrackDuration () -> Float64 {
    guard let currentItem = self.currentItem else { return 0.0 }
    guard currentItem.loadedTimeRanges.count > 0 else { return 0.0 }
    let timeInSecond = CMTimeGetSeconds((currentItem.loadedTimeRanges[0].CMTimeRangeValue).duration);
    return timeInSecond >= 0.0 ? timeInSecond : 0.0
 }
}