Ios 如何判断AVPlayer何时播放了3秒钟
我有一个包含视频的应用程序,当单元格可见时,该应用程序会在Ios 如何判断AVPlayer何时播放了3秒钟,ios,swift,tableview,avplayer,Ios,Swift,Tableview,Avplayer,我有一个包含视频的应用程序,当单元格可见时,该应用程序会在UIImageView中的UITableView中自动播放视频,我要做的就是让应用程序知道视频何时播放了三秒。我写了这段代码 class PostCell: UITableViewCell { var player: AVPlayer? var playerLayer: AVPlayerLayer? var post: Post? { didSet { updateView()
UIImageView
中的UITableView
中自动播放视频,我要做的就是让应用程序知道视频何时播放了三秒。我写了这段代码
class PostCell: UITableViewCell {
var player: AVPlayer?
var playerLayer: AVPlayerLayer?
var post: Post? {
didSet {
updateView()
}
}
func updateView() {
self.viewcount()
if let videoUrlString = post?.videoUrl, let videoUrl = URL(string: videoUrlString) {
player = AVPlayer(url: videoUrl)
playerLayer = AVPlayerLayer(player: player)
playerLayer?.frame = postImageView.frame
playerLayer?.frame.size.width = postImageView.frame.size.width
playerLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
self.contentView.layer.addSublayer(playerLayer!)
player?.play()
}
func viewcount() {
if let currentitem = player?.currentItem {
if currentitem.currentTime() == CMTimeMake(3, 1) {
print ("VIDEO PLAYED FOR THREE SECONDS")
}
}
}
}
但一旦视频开始播放,它就不会打印出我的信息。我在网上搜索了帮助,但找不到关于这个主题的任何东西。所以,有人能帮我解决这个问题,告诉我我做错了什么吗?请在播放器开始播放后尝试调用视图计数
func updateView() {
/// Not here Because at this time player current item is not initiated yet
/// if you use Breakpoints in viewCount code you will see it won't enter
/// in if condition created
self.viewcount() /// Comment this line
if let videoUrlString = post?.videoUrl, let videoUrl = URL(string: videoUrlString) {
player = AVPlayer(url: videoUrl)
playerLayer = AVPlayerLayer(player: player)
playerLayer?.frame = postImageView.frame
playerLayer?.frame.size.width = postImageView.frame.size.width
playerLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
self.contentView.layer.addSublayer(playerLayer!)
/// Player is initiated with a item to play
player?.play()
/// Call current time here
/// Now it will Enter in if Condition
/// Also try using else statement so you know Do control enter in if or in Else
self.viewcount()
}
func viewcount()
{
if let currentitem = player?.currentItem
{
///Yes Player have a item whose time can be Detected
if currentitem.currentTime() == CMTimeMake(3, 1)
{
print ("VIDEO PLAYED FOR THREE SECONDS")
}
}
else
{
/// Check do Control reach here in case 1 When you are calling before player.play()
}
}
您正在搜索玩家的观察者,这里是您如何检查和跟踪AVPlayer的当前位置 下面是将观察者添加到单元格的函数
private func addObserversForVideoPlayer(cell:CustomCell) {
let observer = cell.player?.addPeriodicTimeObserver(forInterval: CMTime.init(seconds: 1, preferredTimescale: 1), queue: .main, using: {[weak self,weak cell] (time) in
guard let cell = cell else {return}
if cell.player?.currentItem?.status == .readyToPlay {
// print("Inside Will DISPLAY\(cell.video.currentTime)")
let timeDuration : Float64 = CMTimeGetSeconds((cell.player?.currentItem?.asset.duration)!)
cell.lblDuration.text = self?.getDurationFromTime(time: timeDuration)
let currentTime : Float64 = CMTimeGetSeconds((cell.player?.currentTime())!)
cell.lblStart.text = self?.getDurationFromTime(time: currentTime)
cell.slider.maximumValue = Float(timeDuration.rounded())
cell.slider.value = Float(currentTime.rounded())
}
})
NotificationCenter.default.addObserver(forName: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: cell.player?.currentItem, queue: .main, using: {[weak cell,weak self] (notification) in
if cell?.player != nil {
cell?.player?.seek(to: kCMTimeZero)
cell?.player?.play()
}
})
}
这样addPeriodicTimeObserver
将在播放器开始播放时通知您
而NSNotification.Name.AVPlayerItemDidPlayToEndTime
将在AVPlayer停止时通知您
注1:如果在添加AVPlayerItemDidPlayToEndTime
时,您的cell.player?.currentItem
为nil,则会导致出现错误,如果出现此错误,请参阅。您不需要它,不要添加它:)
注2:您应该保留观察者
,以便在一段时间后可以删除它,这样就不会对内存造成额外负载
希望它有帮助特别是:尝试在player.Play()之后调用self.viewcount(),就像在self.viewcount()中一样。您正在检查player当前时间,而此时它没有播放任何内容