UIPasteboard.Notifications.ObserveRemoved 方法
定义
重要
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重载
| ObserveRemoved(EventHandler<UIPasteboardChangeEventArgs>) |
常量的强类型通知 RemovedNotification 。 |
| ObserveRemoved(NSObject, EventHandler<UIPasteboardChangeEventArgs>) |
常量的强类型通知 RemovedNotification 。 |
ObserveRemoved(EventHandler<UIPasteboardChangeEventArgs>)
常量的强类型通知 RemovedNotification 。
public static Foundation.NSObject ObserveRemoved(EventHandler<UIKit.UIPasteboardChangeEventArgs> handler);static member ObserveRemoved : EventHandler<UIKit.UIPasteboardChangeEventArgs> -> Foundation.NSObject参数
- handler
- EventHandler<UIPasteboardChangeEventArgs>
发布通知时调用的方法。
返回
令牌对象，可用于停止接收通知，方法是释放通知或将其传递给 RemoveObservers(IEnumerable<NSObject>)
注解
以下示例演示开发人员如何在代码中使用此方法：
//
// Lambda style
//
// listening
notification = UIPasteboard.Notifications.ObserveRemoved ((sender, args) => {
/* Access strongly typed args */
Console.WriteLine ("Notification: {0}", args.Notification);
Console.WriteLine ("TypesAdded", args.TypesAdded);
Console.WriteLine ("TypesRemoved", args.TypesRemoved);
});
// To stop listening:
notification.Dispose ();
//
//Method style
//
NSObject notification;
void Callback (object sender, UIKit.UIPasteboardChangeEventArgs args)
{
// Access strongly typed args
Console.WriteLine ("Notification: {0}", args.Notification);
Console.WriteLine ("TypesAdded", args.TypesAdded);
Console.WriteLine ("TypesRemoved", args.TypesRemoved);
}
void Setup ()
{
notification = UIPasteboard.Notifications.ObserveRemoved (Callback);
}
void Teardown ()
{
notification.Dispose ();
}
适用于
ObserveRemoved(NSObject, EventHandler<UIPasteboardChangeEventArgs>)
常量的强类型通知 RemovedNotification 。
public static Foundation.NSObject ObserveRemoved(Foundation.NSObject objectToObserve, EventHandler<UIKit.UIPasteboardChangeEventArgs> handler);static member ObserveRemoved : Foundation.NSObject * EventHandler<UIKit.UIPasteboardChangeEventArgs> -> Foundation.NSObject参数
- objectToObserve
- NSObject
要观察的对象。
- handler
- EventHandler<UIPasteboardChangeEventArgs>
发布通知时调用的方法。
返回
令牌对象，可用于停止接收通知，方法是释放通知或将其传递给 RemoveObservers(IEnumerable<NSObject>)
注解
此方法可用于订阅 RemovedNotification 通知。
// Listen to all notifications posted for any object
var token = UIPasteboard.Notifications.ObserveRemoved ((notification) => {
Console.WriteLine ("Observed RemovedNotification!");
};
// Listen to all notifications posted for a single object
var token = UIPasteboard.Notifications.ObserveRemoved (objectToObserve, (notification) => {
Console.WriteLine ($"Observed RemovedNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();