UIView.Notifications.ObserveFocusedElementKey Method
Definition
Important
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Overloads
| ObserveFocusedElementKey(EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the P:UIKit.UIView.FocusedElementKeyNotification constant. |
| ObserveFocusedElementKey(NSObject, EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the P:UIKit.UIView.FocusedElementKeyNotification constant. |
ObserveFocusedElementKey(EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the P:UIKit.UIView.FocusedElementKeyNotification constant.
public static Foundation.NSObject ObserveFocusedElementKey (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveFocusedElementKey : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObjectParameters
- handler
- EventHandler<NSNotificationEventArgs>
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 P:UIKit.UIView.FocusedElementKeyNotification notifications.
// Listen to all notifications posted for any object
var token = UIView.Notifications.ObserveFocusedElementKey ((notification) => {
Console.WriteLine ("Observed FocusedElementKeyNotification!");
};
// Listen to all notifications posted for a single object
var token = UIView.Notifications.ObserveFocusedElementKey (objectToObserve, (notification) => {
Console.WriteLine ($"Observed FocusedElementKeyNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
Applies to
ObserveFocusedElementKey(NSObject, EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the P:UIKit.UIView.FocusedElementKeyNotification constant.
public static Foundation.NSObject ObserveFocusedElementKey (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveFocusedElementKey : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObjectParameters
- objectToObserve
- NSObject
The object to observe.
- handler
- EventHandler<NSNotificationEventArgs>
Method to invoke when the notification is posted.
Returns
Token object that can be used to stop receiving notifications by either disposing it or passing it to RemoveObservers(IEnumerable<NSObject>)
Remarks
This method can be used to subscribe for P:UIKit.UIView.FocusedElementKeyNotification notifications.
// Listen to all notifications posted for any object
var token = UIView.Notifications.ObserveFocusedElementKey ((notification) => {
Console.WriteLine ("Observed FocusedElementKeyNotification!");
};
// Listen to all notifications posted for a single object
var token = UIView.Notifications.ObserveFocusedElementKey (objectToObserve, (notification) => {
Console.WriteLine ($"Observed FocusedElementKeyNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();