PdfView.Notifications.ObserveChangedHistory 方法

定义

重载

ObserveChangedHistory(EventHandler<NSNotificationEventArgs>)

常量的强类型通知 ChangedHistoryNotification

ObserveChangedHistory(NSObject, EventHandler<NSNotificationEventArgs>)

常量的强类型通知 ChangedHistoryNotification

ObserveChangedHistory(EventHandler<NSNotificationEventArgs>)

常量的强类型通知 ChangedHistoryNotification

public static Foundation.NSObject ObserveChangedHistory (EventHandler<Foundation.NSNotificationEventArgs> handler);
static member ObserveChangedHistory : 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 ChangedHistoryNotification 通知。

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

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

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

适用于

ObserveChangedHistory(NSObject, EventHandler<NSNotificationEventArgs>)

常量的强类型通知 ChangedHistoryNotification

public static Foundation.NSObject ObserveChangedHistory (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);
static member ObserveChangedHistory : 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 ChangedHistoryNotification 通知。

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

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

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

适用于