我正在Swift中制作一个iOS应用，该应用在屏幕右上角的一小层中循环播放视频，其中显示了特定颜色项目的视频。用户然后在屏幕上点击相应的彩色项目。当他们这样做时，videoName变量将随机更改为下一种颜色，并触发相应的视频。如附件代码所示，我使用AVPlayer，AVPlayerItem来播放，播放和循环播放视频没有问题。我遇到的问题是，无论何时显示下一个视频，上一个视频都会在其后面保持打开状态。此外，播放了16个视频后，播放器在我的iPad上完全消失了。我已经尝试过在此站点和其他站点中提出的许多建议，但是要么迅速发现它们有问题，要么就不起作用。所以问题：在我的代码中，我如何告诉它“嘿，下一个视频已经开始播放，请删除上一个视频，并将其分层并释放内存，以便我可以根据需要播放尽可能多的视频”？
//set variables for video play
var playerItem:AVPlayerItem?
var player:AVPlayer?
//variables that contain video file path, name and extension
var videoPath = NSBundle.mainBundle().resourcePath!
var videoName = "blue"
let videoExtension = ".mp4"
//DISPLAY VIDEO
func showVideo(){
//Assign url path
let url = NSURL(fileURLWithPath: videoPath+"/Base.lproj/"+videoName+videoExtension)
playerItem = AVPlayerItem(URL: url)
player=AVPlayer(playerItem: playerItem!)
let playerLayer=AVPlayerLayer(player: player!)
//setplayser location in uiview and show video
playerLayer.frame=CGRectMake(700, 5, 350, 350)
self.view.layer.addSublayer(playerLayer)
player!.play()
// Add notification to know when the video ends, then replay it again. THIS IS A CONTINUAL LOOP
NSNotificationCenter.defaultCenter().addObserverForName(AVPlayerItemDidPlayToEndTimeNotification, object: player!.currentItem, queue: nil)
{ notification in
let t1 = CMTimeMake(5, 100);
self.player!.seekToTime(t1)
self.player!.play()
}
}
`
我改编了@Anupam Mishra的Swift代码建议。最初它没有用，但最终我想我必须将playerLayer置于函数之外，然后在将播放器设置为nil之后关闭playerLayer。也。我创建了一个变量开关来指示何时说“杀死播放器并杀死图层”，而不是使用毫无疑问仍然可以使用的“ if（player！.rate> 0 ...）”，如下所示。它可能不漂亮，但可以！ 以下内容适用于像我这样的绝对新手-我从这次经验中学到的东西：在我看来，ios设备仅允许将16层添加到viewController（或superLayer）中。因此，除非您真的希望一次运行16个图层，否则在删除其播放器的下一个图层之前，需要删除每个图层。 此代码对您的实际作用：此代码在现有viewController上创建可调整大小的图层，并无限循环播放视频[[来自您的捆绑包。当下一个视频将要被调用时，当前视频和该图层将被完全删除，释放内存，然后播放包含新视频的新图层。可以使用playerLayer.frame = CGRectMake（left，top，width，height）参数完全自定义视频层的大小和位置。 如何进行所有工作：假设您已将视频添加到捆绑包中，请为按钮点击创建另一个功能。在该函数中，首先调用“ stopPlayer（）”函数，将“ videoName”变量更改为所需的新视频名称，然后调用“ showVideo（）”函数。 （如果您需要更改视频扩展名，请将“ videoExtension”从let更改为var。
`//set variables for video play
var playerItem:AVPlayerItem?
var player:AVPlayer?
var playerLayer = AVPlayerLayer() //NEW playerLayer var location
//variables that contain video file path, name and extension
var videoPath = NSBundle.mainBundle().resourcePath!
var videoName = "blue"
let videoExtension = ".mp4"
var createLayerSwitch = true /*NEW switch to say whether on not to create the layer when referenced by the closePlayer and showVideo functions*/
//DISPLAY VIDEO
func showVideo(){
//Assign url path
let url = NSURL(fileURLWithPath: videoPath+"/Base.lproj/"+videoName+videoExtension)
playerItem = AVPlayerItem(URL: url)
player=AVPlayer(playerItem: playerItem!)
playerLayer=AVPlayerLayer(player: player!) //NEW: remove 'let' from playeLayer here.
//setplayser location in uiview and show video
playerLayer.frame=CGRectMake(700, 5, 350, 350)
self.view.layer.addSublayer(playerLayer)
player!.play()
createLayerSwitch = false //NEW switch to tell if a layer is already created or not. I set the switch to false so that when the next tapped item/button references the closePlayer() function, the condition is triggered to close the player AND the layer
// Add notification to know when the video ends, then replay it again without a pause between replays. THIS IS A CONTINUAL LOOP
NSNotificationCenter.defaultCenter().addObserverForName(AVPlayerItemDidPlayToEndTimeNotification, object: player!.currentItem, queue: nil)
{ notification in
let t1 = CMTimeMake(5, 100);
self.player!.seekToTime(t1)
self.player!.play()
}
}
//NEW function to kill the current player and layer before playing the next video
func closePlayer(){
if (createLayerSwitch == false) {
player!.pause()
player = nil
playerLayer.removefromsuperlayer()
}
}
`
replaceCurrentItemWithPlayerItem？您将为所有视频保留同一播放器。我认为这是一种更好的方法。编辑： replaceCurrentItemWithPlayerItem必须在主线程上调用
Swift Code-
if player!.rate > 0 && player!.error == nil
{
player!.pause()
player = nil
}
Objective-C Code-
if (player.rate > 0 && !player.error)
{
[player setRate:0.0];
}