AVCaptureDevice.Notifications.ObserveWasConnected Method

Definition

Overloads

ObserveWasConnected(EventHandler<NSNotificationEventArgs>)

Strongly typed notification for the WasConnectedNotification constant.

ObserveWasConnected(NSObject, EventHandler<NSNotificationEventArgs>)

Strongly typed notification for the WasConnectedNotification constant.

ObserveWasConnected(EventHandler<NSNotificationEventArgs>)

Strongly typed notification for the WasConnectedNotification constant.

public static Foundation.NSObject ObserveWasConnected (EventHandler<Foundation.NSNotificationEventArgs> handler);
static member ObserveWasConnected : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject

Parameters

handler
EventHandler<NSNotificationEventArgs>

Method to invoke when the notification is posted.

Returns

NSObject

Token object that can be used to stop receiving notifications by either disposing it or passing it to RemoveObservers(IEnumerable<NSObject>)

Remarks

The following example shows how you can use this method in your code

//
// Lambda style
//

// listening
notification = AVCaptureDevice.Notifications.ObserveWasConnected ((sender, args) => {
    /* Access strongly typed args */
    Console.WriteLine ("Notification: {0}", args.Notification);
});

// To stop listening:
notification.Dispose ();

//
//Method style
//
NSObject notification;
void Callback (object sender, Foundation.NSNotificationEventArgs args)
{
    // Access strongly typed args
    Console.WriteLine ("Notification: {0}", args.Notification);
}

void Setup ()
{
    notification = AVCaptureDevice.Notifications.ObserveWasConnected (Callback);
}

void Teardown ()
{
    notification.Dispose ();
}

Applies to

ObserveWasConnected(NSObject, EventHandler<NSNotificationEventArgs>)

Strongly typed notification for the WasConnectedNotification constant.

public static Foundation.NSObject ObserveWasConnected (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);
static member ObserveWasConnected : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject

Parameters

objectToObserve
NSObject

The specific object to observe.

handler
EventHandler<NSNotificationEventArgs>

The handler that responds to the notification when it occurs.

Returns

NSObject

Token object that can be used to stop receiving notifications by either disposing it or passing it to RemoveObservers(IEnumerable<NSObject>)

Remarks

This method can be used to subscribe for WasConnectedNotification notifications.

// Listen to all notifications posted for any object
var token = AVCaptureDevice.Notifications.ObserveWasConnected ((notification) => {
	Console.WriteLine ("Observed WasConnectedNotification!");
};

// Listen to all notifications posted for a single object
var token = AVCaptureDevice.Notifications.ObserveWasConnected (objectToObserve, (notification) => {
	Console.WriteLine ($"Observed WasConnectedNotification for {nameof (objectToObserve)}!");
};

// Stop listening for notifications
token.Dispose ();

Applies to