UIKeyboard.Notifications.ObserveWillChangeFrame UIKeyboard.Notifications.ObserveWillChangeFrame Method

Definition

Overloads

ObserveWillChangeFrame(EventHandler<UIKeyboardEventArgs>) ObserveWillChangeFrame(EventHandler<UIKeyboardEventArgs>)

Strongly typed notification for the WillChangeFrameNotification constant.

ObserveWillChangeFrame(NSObject, EventHandler<UIKeyboardEventArgs>) ObserveWillChangeFrame(NSObject, EventHandler<UIKeyboardEventArgs>)

Strongly typed notification for the WillChangeFrameNotification constant.

ObserveWillChangeFrame(EventHandler<UIKeyboardEventArgs>) ObserveWillChangeFrame(EventHandler<UIKeyboardEventArgs>)

Strongly typed notification for the WillChangeFrameNotification constant.

public static Foundation.NSObject ObserveWillChangeFrame (EventHandler<UIKit.UIKeyboardEventArgs> handler);
static member ObserveWillChangeFrame : EventHandler<UIKit.UIKeyboardEventArgs> -> Foundation.NSObject

Parameters

handler
EventHandler<UIKeyboardEventArgs>

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 you can use this method in your code


//
// Lambda style
//

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

Console.WriteLine ("FrameBegin", args.FrameBegin);
Console.WriteLine ("FrameEnd", args.FrameEnd);
Console.WriteLine ("AnimationDuration", args.AnimationDuration);
Console.WriteLine ("AnimationCurve", args.AnimationCurve);

});

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

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

Console.WriteLine ("FrameBegin", args.FrameBegin);
Console.WriteLine ("FrameEnd", args.FrameEnd);
Console.WriteLine ("AnimationDuration", args.AnimationDuration);
Console.WriteLine ("AnimationCurve", args.AnimationCurve);

}

void Setup () { notification = UIKeyboard.Notifications.ObserveWillChangeFrame (Callback); }

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

ObserveWillChangeFrame(NSObject, EventHandler<UIKeyboardEventArgs>) ObserveWillChangeFrame(NSObject, EventHandler<UIKeyboardEventArgs>)

Strongly typed notification for the WillChangeFrameNotification constant.

public static Foundation.NSObject ObserveWillChangeFrame (Foundation.NSObject objectToObserve, EventHandler<UIKit.UIKeyboardEventArgs> handler);
static member ObserveWillChangeFrame : Foundation.NSObject * EventHandler<UIKit.UIKeyboardEventArgs> -> Foundation.NSObject

Parameters

objectToObserve
NSObject NSObject

The object to observe.

handler
EventHandler<UIKeyboardEventArgs>

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

This method can be used to subscribe for WillChangeFrameNotification notifications.


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

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

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

Applies to