在 AVPlayerLayer 和 AVPlayerViewController 中同步视频
Sync video in AVPlayerLayer and AVPlayerViewController
我正在与 AVPlayer
一起使用 URL
显示正在播放的视频。它有两个部分:
1. 首先,我使用 AVPlayerLayer
将 AVPlayer
嵌入到视图的子层中,即
var player: AVPlayer?
func configure() {
let urlString = "https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"
if let url = URL(string: urlString) {
self.player = AVPlayer(url: url)
let playerLayer = AVPlayerLayer(player: self.player)
playerLayer.frame = self.view.bounds
self.view.layer.addSublayer(playerLayer)
player.play()
}
}
以上代码运行良好,视频正在播放。
2. 其次,在点击 UIButton
时,我将使用我创建的相同 AVPlayer
实例呈现 AVPlayerViewController
较早,即
@IBAction func onTapVideoButton(_ sender: UIButton) {
self.player?.pause()
let controller = AVPlayerViewController()
controller.player = self.player
self.present(controller, animated: true) {
self.player?.play()
}
}
我遇到的问题是,AVPlayerViewController
打开后,视频停止播放,但音频仍在播放。
我想要的是在AVPlayerLayer
和AVPlayerViewController
中同步视频。
我认为将已创建的播放器共享到 AVPlayerViewController 时存在问题。我不确定为什么会停止,但如果您为该控制器创建一个新的 AVPlayer,它就不会发生。同步播放器和 AVPlayerViewController 的方法可能是这样的:
首先,您创建一个通知名称,您将在关闭 AVPlayerViewController 时使用它(Apple 不会让您知道用户何时关闭 AVPlayerViewController):
extension Notification.Name {
static let avPlayerDidDismiss = Notification.Name("avPlayerDidDismiss")
}
然后,您将 AVPlayerViewController 扩展到 post 此通知何时会被关闭并发送用户离开视频的时间:
extension AVPlayerViewController {
open override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
if let seekTime = player?.currentTime() {
let userInfo = ["seekTime": seekTime]
NotificationCenter.default.post(name: .avPlayerDidDismiss, object: nil, userInfo: userInfo)
}
}
}
并且在您的 ViewController 中您观察到该通知,获取您想要的 seekTime 并使用它来设置您的 avPlayer:
class ViewController: UIViewController {
var player: AVPlayer?
deinit {
NotificationCenter.default.removeObserver(self)
}
override func viewDidLoad() {
super.viewDidLoad()
configure()
NotificationCenter.default.addObserver(self, selector: #selector(avPlayerDidDismiss), name: .avPlayerDidDismiss, object: nil)
}
func configure() {
self.player = getPlayer()
let playerLayer = AVPlayerLayer(player: self.player)
playerLayer.frame = self.view.bounds
self.view.layer.addSublayer(playerLayer)
self.player?.play()
}
@IBAction func onTapVideoButton(_ sender: UIButton) {
self.player?.pause()
let controllerPlayer = getPlayer()
controllerPlayer.currentItem?.seek(to: self.player!.currentTime(), completionHandler: nil)
let controller = AVPlayerViewController()
controller.player = controllerPlayer
self.present(controller, animated: true, completion: {
controller.player?.play()
})
}
func getPlayer() -> AVPlayer {
let url = URL(string: "https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4")!
return AVPlayer(url: url)
}
@objc
private func avPlayerDidDismiss(_ notification: Notification) {
if let seekTime = notification.userInfo?["seekTime"] as? CMTime {
player?.currentItem?.seek(to: seekTime, completionHandler: nil)
player?.play()
}
}
}
缺点:它将为每个 AVPlayerViewController 发送通知。当您需要此信息时,您可以将您添加为观察员。希望它能有所帮助。
我正在与 AVPlayer
一起使用 URL
显示正在播放的视频。它有两个部分:
1. 首先,我使用 AVPlayerLayer
将 AVPlayer
嵌入到视图的子层中,即
var player: AVPlayer?
func configure() {
let urlString = "https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"
if let url = URL(string: urlString) {
self.player = AVPlayer(url: url)
let playerLayer = AVPlayerLayer(player: self.player)
playerLayer.frame = self.view.bounds
self.view.layer.addSublayer(playerLayer)
player.play()
}
}
以上代码运行良好,视频正在播放。
2. 其次,在点击 UIButton
时,我将使用我创建的相同 AVPlayer
实例呈现 AVPlayerViewController
较早,即
@IBAction func onTapVideoButton(_ sender: UIButton) {
self.player?.pause()
let controller = AVPlayerViewController()
controller.player = self.player
self.present(controller, animated: true) {
self.player?.play()
}
}
我遇到的问题是,AVPlayerViewController
打开后,视频停止播放,但音频仍在播放。
我想要的是在AVPlayerLayer
和AVPlayerViewController
中同步视频。
我认为将已创建的播放器共享到 AVPlayerViewController 时存在问题。我不确定为什么会停止,但如果您为该控制器创建一个新的 AVPlayer,它就不会发生。同步播放器和 AVPlayerViewController 的方法可能是这样的:
首先,您创建一个通知名称,您将在关闭 AVPlayerViewController 时使用它(Apple 不会让您知道用户何时关闭 AVPlayerViewController):
extension Notification.Name {
static let avPlayerDidDismiss = Notification.Name("avPlayerDidDismiss")
}
然后,您将 AVPlayerViewController 扩展到 post 此通知何时会被关闭并发送用户离开视频的时间:
extension AVPlayerViewController {
open override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
if let seekTime = player?.currentTime() {
let userInfo = ["seekTime": seekTime]
NotificationCenter.default.post(name: .avPlayerDidDismiss, object: nil, userInfo: userInfo)
}
}
}
并且在您的 ViewController 中您观察到该通知,获取您想要的 seekTime 并使用它来设置您的 avPlayer:
class ViewController: UIViewController {
var player: AVPlayer?
deinit {
NotificationCenter.default.removeObserver(self)
}
override func viewDidLoad() {
super.viewDidLoad()
configure()
NotificationCenter.default.addObserver(self, selector: #selector(avPlayerDidDismiss), name: .avPlayerDidDismiss, object: nil)
}
func configure() {
self.player = getPlayer()
let playerLayer = AVPlayerLayer(player: self.player)
playerLayer.frame = self.view.bounds
self.view.layer.addSublayer(playerLayer)
self.player?.play()
}
@IBAction func onTapVideoButton(_ sender: UIButton) {
self.player?.pause()
let controllerPlayer = getPlayer()
controllerPlayer.currentItem?.seek(to: self.player!.currentTime(), completionHandler: nil)
let controller = AVPlayerViewController()
controller.player = controllerPlayer
self.present(controller, animated: true, completion: {
controller.player?.play()
})
}
func getPlayer() -> AVPlayer {
let url = URL(string: "https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4")!
return AVPlayer(url: url)
}
@objc
private func avPlayerDidDismiss(_ notification: Notification) {
if let seekTime = notification.userInfo?["seekTime"] as? CMTime {
player?.currentItem?.seek(to: seekTime, completionHandler: nil)
player?.play()
}
}
}
缺点:它将为每个 AVPlayerViewController 发送通知。当您需要此信息时,您可以将您添加为观察员。希望它能有所帮助。