PdfView.Notifications.ObserveAnnotationWillHit 方法
定义
重要
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重载
ObserveAnnotationWillHit(EventHandler<NSNotificationEventArgs>)
常量的强类型通知 AnnotationWillHitNotification 。
public static Foundation.NSObject ObserveAnnotationWillHit (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveAnnotationWillHit : 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 AnnotationWillHitNotification 通知。
// Listen to all notifications posted for any object
var token = PdfView.Notifications.ObserveAnnotationWillHit ((notification) => {
Console.WriteLine ("Observed AnnotationWillHitNotification!");
};
// Listen to all notifications posted for a single object
var token = PdfView.Notifications.ObserveAnnotationWillHit (objectToObserve, (notification) => {
Console.WriteLine ($"Observed AnnotationWillHitNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
适用于
ObserveAnnotationWillHit(NSObject, EventHandler<NSNotificationEventArgs>)
常量的强类型通知 AnnotationWillHitNotification 。
public static Foundation.NSObject ObserveAnnotationWillHit (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveAnnotationWillHit : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject参数
- objectToObserve
- NSObject
要观察的对象。
- handler
- EventHandler<NSNotificationEventArgs>
发布通知时调用的方法。
返回
令牌对象，可用于通过释放通知或将其传递给来停止接收通知 RemoveObservers(IEnumerable<NSObject>)
注解
此方法可用于订阅 AnnotationWillHitNotification 通知。
// Listen to all notifications posted for any object
var token = PdfView.Notifications.ObserveAnnotationWillHit ((notification) => {
Console.WriteLine ("Observed AnnotationWillHitNotification!");
};
// Listen to all notifications posted for a single object
var token = PdfView.Notifications.ObserveAnnotationWillHit (objectToObserve, (notification) => {
Console.WriteLine ($"Observed AnnotationWillHitNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();