PdfView.Notifications.ObserveAnnotationHit Method

Definition

Namespace:

PdfKit

Assembly:

Xamarin.iOS.dll

Overloads

ObserveAnnotationHit(EventHandler<PdfViewAnnotationHitEventArgs>)	Strongly typed notification for the AnnotationHitNotification constant.
ObserveAnnotationHit(NSObject, EventHandler<PdfViewAnnotationHitEventArgs>)	Strongly typed notification for the AnnotationHitNotification constant.

ObserveAnnotationHit(EventHandler<PdfViewAnnotationHitEventArgs>)

Strongly typed notification for the AnnotationHitNotification constant.

public static Foundation.NSObject ObserveAnnotationHit (EventHandler<PdfKit.PdfViewAnnotationHitEventArgs> handler);

static member ObserveAnnotationHit : EventHandler<PdfKit.PdfViewAnnotationHitEventArgs> -> Foundation.NSObject

Parameters

handler

EventHandler<PdfViewAnnotationHitEventArgs>

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 developers can use this method in their code:

//
// Lambda style
//

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

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

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

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

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

void Setup ()
{
    notification = PdfView.Notifications.ObserveAnnotationHit (Callback);
}

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

ObserveAnnotationHit(NSObject, EventHandler<PdfViewAnnotationHitEventArgs>)

Strongly typed notification for the AnnotationHitNotification constant.

public static Foundation.NSObject ObserveAnnotationHit (Foundation.NSObject objectToObserve, EventHandler<PdfKit.PdfViewAnnotationHitEventArgs> handler);

static member ObserveAnnotationHit : Foundation.NSObject * EventHandler<PdfKit.PdfViewAnnotationHitEventArgs> -> Foundation.NSObject

Parameters

objectToObserve

NSObject

The object to observe.

handler

EventHandler<PdfViewAnnotationHitEventArgs>

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

This method can be used to subscribe for AnnotationHitNotification notifications.

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

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

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