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A easier way to handle AVPlayer's events
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| // AVPlayerDelegate.swift | |
| // | |
| // Created by Maxim Kotliar on 7/30/18. | |
| // | |
| import AVFoundation | |
| @objc protocol AVPlayerDelegate: class { | |
| @objc optional func playerDidStartPlayback() | |
| @objc optional func playerDidPausePlayback() | |
| @objc optional func playerDidChangeCurrentItem(to item: AVPlayerItem?) | |
| @objc optional func playerItemTimeJumped(item: AVPlayerItem) | |
| @objc optional func playerItemPlaybackStalled(item: AVPlayerItem) | |
| @objc optional func playerItemDidPlayToEndTime(item: AVPlayerItem) | |
| @objc optional func playerItemPlayToEndTimeFailed(item: AVPlayerItem) | |
| } | |
| private let notificationNames: [Notification.Name] = [.AVPlayerItemTimeJumped, | |
| .AVPlayerItemPlaybackStalled, | |
| .AVPlayerItemDidPlayToEndTime, | |
| .AVPlayerItemFailedToPlayToEndTime] | |
| extension AVPlayer { | |
| private struct AssociatedKey { | |
| static var delegate: UInt8 = 0 | |
| static var currentItem: UInt8 = 0 | |
| static var rate: UInt8 = 0 | |
| } | |
| var delegate: AVPlayerDelegate? { | |
| get { | |
| return objc_getAssociatedObject(self, &AssociatedKey.delegate) as? AVPlayerDelegate | |
| } | |
| set { | |
| objc_setAssociatedObject(self, &AssociatedKey.delegate, newValue, .OBJC_ASSOCIATION_ASSIGN) | |
| setupObservers() | |
| } | |
| } | |
| private func setupObservers() { | |
| let notificationCenter = NotificationCenter.default | |
| notificationNames.forEach { | |
| guard delegate != nil else { | |
| notificationCenter.removeObserver(self, name: $0, object: nil) | |
| return | |
| } | |
| notificationCenter.addObserver(self, | |
| selector: #selector(handleNotification(_:)), | |
| name: $0, | |
| object: nil) | |
| } | |
| switch delegate { | |
| case .some: | |
| currentItemObserver = observe(\.currentItem, options: [.new]) { [weak self] _, change in | |
| guard let item = change.newValue else { return } | |
| self?.delegate?.playerDidChangeCurrentItem?(to: item) | |
| } | |
| rateObserver = observe(\.rate, options: [.old, .new]) { [weak self] _, change in | |
| guard let oldRate = change.oldValue else { return } | |
| guard let newRate = change.newValue else { return } | |
| if oldRate != 0 && newRate == 0 { | |
| self?.delegate?.playerDidPausePlayback?() | |
| } else if oldRate == 0 && newRate != 0 { | |
| self?.delegate?.playerDidStartPlayback?() | |
| } | |
| } | |
| case .none: | |
| currentItemObserver = nil | |
| rateObserver = nil | |
| } | |
| } | |
| private var currentItemObserver: NSKeyValueObservation? { | |
| get { | |
| return objc_getAssociatedObject(self, &AssociatedKey.currentItem) as? NSKeyValueObservation | |
| } | |
| set { | |
| currentItemObserver.flatMap { $0.invalidate() } | |
| objc_setAssociatedObject(self, &AssociatedKey.currentItem, newValue, .OBJC_ASSOCIATION_RETAIN) | |
| } | |
| } | |
| private var rateObserver: NSKeyValueObservation? { | |
| get { | |
| return objc_getAssociatedObject(self, &AssociatedKey.rate) as? NSKeyValueObservation | |
| } | |
| set { | |
| rateObserver.flatMap { $0.invalidate() } | |
| objc_setAssociatedObject(self, &AssociatedKey.rate, newValue, .OBJC_ASSOCIATION_RETAIN) | |
| } | |
| } | |
| @objc private func handleNotification(_ notification: Notification) { | |
| guard let item = notification.object as? AVPlayerItem else { return } | |
| guard item == currentItem else { return } | |
| switch notification.name { | |
| case .AVPlayerItemTimeJumped: | |
| delegate?.playerItemTimeJumped?(item: item) | |
| case .AVPlayerItemPlaybackStalled: | |
| delegate?.playerItemPlaybackStalled?(item: item) | |
| case .AVPlayerItemDidPlayToEndTime: | |
| delegate?.playerItemDidPlayToEndTime?(item: item) | |
| case .AVPlayerItemFailedToPlayToEndTime: | |
| delegate?.playerItemPlayToEndTimeFailed?(item: item) | |
| default: | |
| return | |
| } | |
| } | |
| func cleanupObservers() { | |
| notificationNames.forEach { name in | |
| NotificationCenter.default.removeObserver(self, name: name, object: nil) | |
| } | |
| currentItemObserver = nil | |
| rateObserver = nil | |
| } | |
| } |
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.AVPlayerItemTimeJumpedhas now changed toAVPlayerItem.timeJumpedNotificationFYI.