AirPlay video mirroring

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  
  //... Initialization of application
  
  //Screen notification handlers
  NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
  [center addObserver:self selector:@selector(handleScreenDidConnectNotification:)
                 name:UIScreenDidConnectNotification object:nil];
  [center addObserver:self selector:@selector(handleScreenDidDisconnectNotification:)
                 name:UIScreenDidDisconnectNotification object:nil];

  //Init second screen if presented
  [self initSecondScreen];
  
  return YES;
}

#pragma mark -
#pragma mark Display handling

- (void)handleScreenDidConnectNotification:(NSNotification*)aNotification {
  //Handle AirPlay device connection
  [self initSecondScreen];
}

- (void)handleScreenDidDisconnectNotification:(NSNotification*)aNotification {
  //Handle AirPlay device disconnection
  if (self.secondaryWindow)
  {
    // Hide and then delete the window.
    self.secondaryWindow.hidden = YES;
    self.secondaryWindow = nil;
    
  }
  
}

- (void)initSecondScreen
{
  if ([[UIScreen screens] count] > 1)
  {
    UIScreen *screen = [[UIScreen screens] lastObject];
    
    //Init second window do display content
    if (!self.secondaryWindow)
    {
      self.secondaryWindow = [[UIWindow alloc] initWithFrame:screen.bounds];
      self.secondaryWindow.screen = screen;
      self.secondaryWindow.hidden = NO;
    }
    
    //Controller to display content on AirPlay device
    self.secondaryWindow.rootViewController = [[AirPlayerViewController alloc] init];
    
  }
}