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我试图使用NSTimer在AVPlayer视频上获取currentTime()。使用下面的代码，我总是返回0.0作为视频的当前时间。我究竟做错了什么？AVPlayer视频currentTime始终返回0
var player: AVPlayer!
@IBOutlet weak var playerContainer: UIView!
var t1: Float!
var t2: Float!
var currentSecs: Float!
override func viewDidLoad() {
super.viewDidLoad()
player = AVPlayer(URL: NSURL(string: "http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4")!)
let playerLayer: AVPlayerLayer = AVPlayerLayer(player: self.player)
playerLayer.frame = self.playerContainer.frame
self.view.layer.addSublayer(playerLayer)
player?.play()
t1 = Float(self.player.currentTime().value)
t2 = Float(self.player.currentTime().timescale)
currentSecs = t1/t2
var timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(TheaterViewController.timeUpdate), userInfo: nil, repeats: true)
}
func timeUpdate() {
print(currentSecs) // Only prints 0.0
}