Connecting to external screen (AirPlay)

ExternalScreen.m

static FOScreenVC *_vcScreen;
static UIWindow *_externalWindow;

- (void)setupExternalScreen:(UIScreen *)screen {
    // Ensure screen is full size
    screen.overscanCompensation = UIScreenOverscanCompensationInsetApplicationFrame;
    
    // Create a window for the external screen (if not already)
    if (!_externalWindow) {
        _externalWindow = [[UIWindow alloc] initWithFrame:screen.bounds];
        _externalWindow.windowLevel = UIWindowLevelAlert; // This is a workaround to avoid SVProgressHUD from appearing on external window
        
        _externalWindow.screen = screen;
        _externalWindow.hidden = NO;
    }
    
    if (!_vcScreen) {
        _vcScreen = [FOScreenVC new];
        _externalWindow.rootViewController = _vcScreen;
    }
}

- (void)destroyExternalScreen {
    _externalWindow.screen = nil;
    _externalWindow = nil;
    _vcScreen = nil;
}

- (void)screenDidConnect:(NSNotification *)notif {
    UIScreen *screen = [notif object];
    [self setupExternalScreen:screen];
}

- (void)screenDidDisconnect:(NSNotification *)notif {
    // Let's reset our window and VC (just in case)
    _vcScreen = nil;
    _externalWindow = nil;
}