播放前AVPlayer停止UIActivityIndi​​cator

我试图在AVPlayer开始播放音乐时停止activityIndi​​cator，并且在AVPlayer再次启动（加载，缓冲）时也启动activityIndi​​cator。 这一点起作用，问题是AVPlayer在播放音乐之前几秒（5,6,7）停止activityIndi​​cator。 当它再次（加载，缓冲）时，它不会再次启动activityIndi​​cator。 任何人都知道我的错误在哪里，或者我需要修复它。 谢谢

var activityView = UIActivityIndicatorView(activityIndicatorStyle: .WhiteLarge) var selectIndex:Int = -1 var check = true var url : String! var playerItem:AVPlayerItem? var player:AVPlayer? func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell{ let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! RadioCollectionViewCell cell.backgroundColor = UIColor.yellowColor() let object = objects[indexPath.row] cell.img.image = UIImage(named: object["image"]!) cell.btnPlay.addTarget(self, action: Selector("audioControlButtonAction:"), forControlEvents: UIControlEvents.TouchUpInside) cell.btnPlay.tag = indexPath.row+1 return cell } func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath){ print("You selected cell #\(indexPath.item)!") } func audioControlButtonAction(sender: UIButton){ if check == false { deallocObservers(player!) } var btn:NSInteger btn = sender.tag as NSInteger let object = objects[btn-1] let nurl = NSURL(string: "\(object["url"]!)")! playerItem = AVPlayerItem(URL: nurl) player=AVPlayer(playerItem: playerItem!) print(selectIndex) if selectIndex != -1 && selectIndex != sender.tag { let bt:UIButton = self.view.viewWithTag(selectIndex) as! UIButton if bt.selected == true { bt.selected = false } } if sender.selected == false{ player!.addObserver(self, forKeyPath: "status", options:NSKeyValueObservingOptions(), context: nil) player!.addObserver(self, forKeyPath: "playbackBufferEmpty", options:NSKeyValueObservingOptions(), context: nil) player!.addObserver(self, forKeyPath: "playbackLikelyToKeepUp", options:NSKeyValueObservingOptions(), context: nil) player!.addObserver(self, forKeyPath: "playbackBufferFull", options:NSKeyValueObservingOptions(), context: nil) player!.addObserver(self, forKeyPath: "loadedTimeRanges", options: NSKeyValueObservingOptions(), context: nil) player!.play() sender.selected = true check = false selectIndex = sender.tag activityView.startAnimating() } else{ activityView.stopAnimating() check = true player?.pause() sender.selected = false selectIndex = -1 } print(selectIndex) } func deallocObservers(player: AVPlayer) { player.removeObserver(self, forKeyPath: "status") player.removeObserver(self, forKeyPath: "playbackBufferEmpty") player.removeObserver(self, forKeyPath: "playbackLikelyToKeepUp") player.removeObserver(self, forKeyPath: "loadedTimeRanges") player.removeObserver(self, forKeyPath: "playbackBufferFull") } override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>){ if object?.isEqual(player) == true && keyPath == "status" { print(player?.status) switch player!.status { case AVPlayerStatus.Failed: print("Player item status failed") player?.play() break case AVPlayerStatus.ReadyToPlay: print("Player item status is ready to play") activityView.stopAnimating() break case AVPlayerStatus.Unknown: print("player item status is unknown") break } switch keyPath! { case "playbackBufferFull": activityView.stopAnimating() print("playbackBufferFull") break case "playbackLikelyToKeepUp": activityView.stopAnimating() print("playbackLikelyToKeepUp") break case "playbackBufferEmpty": activityView.startAnimating() print("playbackBufferEmpty") break case "loadedTimeRanges": print("loadedTimeRanges") default: print("Error") break } } } 

}

产量

Player item status is ready to play播放后（5,6,7秒）播放AVPlayer

 -1 1 Optional(__C.AVPlayerStatus) Player item status is ready to play Error 1 -1 -1 1 Optional(__C.AVPlayerStatus) Player item status is ready to play Error 

Answer 1

那么在你的代码中，每当一个单元格被按下，你有activityView.stopAnimating() 。 所以无论如何，animation将开始或停止点击，取决于if sender.selected == false

所以我想如果你删除activityView.stopAnimating()那么它不会停止这么早的animation。 读取你的问题和代码是很难的，因为我不确定输出来自哪里。

Answer 2

关于第二个问题，即“也不是它再次启动activityIndi​​cator（加载，缓冲）”

我认为一个解决方法可能是以下之一：

一个）

 func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath){ print("You selected cell #\(indexPath.item)!") //Start activityView Animation when user clicks on any item which won't be buffered by default activityView.startAnimating() } 

要么

b）

 var selectIndex:Int = -1 { didSet { //Start activityView Animation when user clicks on any item which won't be buffered by default activityView.startAnimating() } }