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AVCaptureSession.Notifications.ObserveRuntimeError Method

Definition

Overloads

ObserveRuntimeError(EventHandler<AVCaptureSessionRuntimeErrorEventArgs>)

Strongly typed notification for the RuntimeErrorNotification constant.

public static Foundation.NSObject ObserveRuntimeError (EventHandler<AVFoundation.AVCaptureSessionRuntimeErrorEventArgs> handler);
static member ObserveRuntimeError : EventHandler<AVFoundation.AVCaptureSessionRuntimeErrorEventArgs> -> Foundation.NSObject

Parameters

handler
EventHandler<AVCaptureSessionRuntimeErrorEventArgs>

Method to invoke when the notification is posted.

Returns

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 developers can use this method in their code:

//
// Lambda style
//

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

    Console.WriteLine ("Error", args.Error);
});

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

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

    Console.WriteLine ("Error", args.Error);
}

void Setup ()
{
    notification = AVCaptureSession.Notifications.ObserveRuntimeError (Callback);
}

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

Applies to

ObserveRuntimeError(NSObject, EventHandler<AVCaptureSessionRuntimeErrorEventArgs>)

Strongly typed notification for the RuntimeErrorNotification constant.

public static Foundation.NSObject ObserveRuntimeError (Foundation.NSObject objectToObserve, EventHandler<AVFoundation.AVCaptureSessionRuntimeErrorEventArgs> handler);
static member ObserveRuntimeError : Foundation.NSObject * EventHandler<AVFoundation.AVCaptureSessionRuntimeErrorEventArgs> -> Foundation.NSObject

Parameters

objectToObserve
NSObject

The specific object to observe.

handler
EventHandler<AVCaptureSessionRuntimeErrorEventArgs>

The handler that responds to the notification when it occurs.

Returns

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 RuntimeErrorNotification notifications.

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

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

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

Applies to