UIFocusUpdateContext.Notifications.ObserveDidUpdate 方法

定义

重载

ObserveDidUpdate(EventHandler<NSNotificationEventArgs>)

常量的强类型通知 DidUpdateNotification

ObserveDidUpdate(NSObject, EventHandler<NSNotificationEventArgs>)

常量的强类型通知 DidUpdateNotification

ObserveDidUpdate(EventHandler<NSNotificationEventArgs>)

常量的强类型通知 DidUpdateNotification

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

参数

handler
EventHandler<NSNotificationEventArgs>

发布通知时调用的方法。

返回

令牌对象,可用于通过释放通知或将其传递给来停止接收通知 RemoveObservers(IEnumerable<NSObject>)

注解

此方法可用于订阅 DidUpdateNotification 通知。

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

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

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

适用于

ObserveDidUpdate(NSObject, EventHandler<NSNotificationEventArgs>)

常量的强类型通知 DidUpdateNotification

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

参数

objectToObserve
NSObject

要观察的对象。

handler
EventHandler<NSNotificationEventArgs>

发布通知时调用的方法。

返回

令牌对象,可用于通过释放通知或将其传递给来停止接收通知 RemoveObservers(IEnumerable<NSObject>)

注解

此方法可用于订阅 DidUpdateNotification 通知。

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

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

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

适用于