Detect when a webview video becomes fullscreen on ios8

Question

I have an app where users can open videos from UIWebview, including Youtube ones. In iOS7, I was able to get a notification when it started playing, or when it became full s

Answer 1

update for Swift 4.2, iOS 12.1 and WKWebView:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    // listen for videos playing in fullscreen
    NotificationCenter.default.addObserver(self, selector: #selector(onDidEnterFullscreen(_:)), name: UIWindow.didBecomeVisibleNotification, object: view.window)

    // listen for videos stopping to play in fullscreen
    NotificationCenter.default.addObserver(self, selector: #selector(onDidLeaveFullscreen(_:)), name: UIWindow.didBecomeHiddenNotification, object: view.window)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    // remove video listeners
    NotificationCenter.default.removeObserver(self, name: UIWindow.didBecomeVisibleNotification, object: view.window)
    NotificationCenter.default.removeObserver(self, name: UIWindow.didBecomeHiddenNotification, object: view.window)
}

@objc func onDidEnterFullscreen(_ notification: Notification) {
    print("video is now playing in fullscreen")
}

@objc func onDidLeaveFullscreen(_ notification: Notification) {
    print("video has stopped playing in fullscreen")
}