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

@NorthBlast's answer works well for detecting any UIWindow appearing on top of the UIViewController that holds the UIWebView. Unfortunately, it's hard to filter what kind of UIWindow is (since, well... you can't really know if it is a video or some other kind of window).

There are 3 special cases I prefer to filter, in which you're sure they are NOT video player windows, those are:

1) _UIAlertControllerShimPresenterWindow, which is a kind of window that appears when using alerts (like UIAlertView).

2) UITextEffectsWindow, which appears when presenting special iOS windows (like the share window, UIActivityViewController).

3) UIRemoteKeyboardWindow which appears when presenting the keyboard (for some reason, this class only appeared to me when using Swift, but on Objective-C it didn't... no clue why is that).

So to subscribe to notifications, I use (just like @NorthBlast said):

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(windowDidBecomeActive:)
                                             name:UIWindowDidBecomeVisibleNotification
                                           object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(windowDidBecomeHidden:)
                                             name:UIWindowDidBecomeHiddenNotification
                                           object:nil];

Then the implementations:

- (void)windowDidBecomeActive:(NSNotification *)notification {
    if ( [self isVideoPlayerWindow:notification.object] ) {
        // Do what's needed if it is a video
        // For example, on a live streaming radio app, I would stop the audio if a video is started
    }
}

- (void)windowDidBecomeHidden:(NSNotification *)notification {
    if ( [self isVideoPlayerWindow:notification.object] ) {
        // Do what's needed if it is a video
    }
}

- (BOOL)isVideoPlayerWindow:(id)notificationObject {
    /*
     Define non video classes here, add more if you need it
    */
    static NSArray *nonVideoClasses = @[
        @"_UIAlertControllerShimPresenterWindow",
        @"UITextEffectsWindow",
        @"UIRemoteKeyboardWindow"
    ];

    BOOL isVideo = YES;
    for ( NSString *testClass in nonVideoClasses ) {
        isVideo = isVideo && ! [notificationObject isKindOfClass:NSClassFromString(testClass)];
    }

    return isVideo;
}