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UIMenuController.Notifications.ObserveWillShowMenu 方法

定義

多載

ObserveWillShowMenu(EventHandler<NSNotificationEventArgs>)

常數的 WillShowMenuNotification 強型別通知。

ObserveWillShowMenu(NSObject, EventHandler<NSNotificationEventArgs>)

常數的 WillShowMenuNotification 強型別通知。

ObserveWillShowMenu(EventHandler<NSNotificationEventArgs>)

常數的 WillShowMenuNotification 強型別通知。

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

參數

handler
EventHandler<NSNotificationEventArgs>

張貼通知時叫用的方法。

傳回

權杖物件,可用來停止接收通知,方法是處置通知或傳遞至 RemoveObservers(IEnumerable<NSObject>)

備註

下列範例示範如何在程式碼中使用此方法

//
// Lambda style
//

// listening
notification = UIMenuController.Notifications.ObserveWillShowMenu ((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 = UIMenuController.Notifications.ObserveWillShowMenu (Callback);
}

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

適用於

ObserveWillShowMenu(NSObject, EventHandler<NSNotificationEventArgs>)

常數的 WillShowMenuNotification 強型別通知。

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

參數

objectToObserve
NSObject

要觀察的物件。

handler
EventHandler<NSNotificationEventArgs>

張貼通知時叫用的方法。

傳回

權杖物件,可用來停止接收通知,方法是處置通知或傳遞至 RemoveObservers(IEnumerable<NSObject>)

備註

這個方法可以用來訂閱 WillShowMenuNotification 通知。

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

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

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

適用於