UIPasteboard.Notifications.ObserveChanged 方法

定義

命名空間:

UIKit

組件:

Xamarin.iOS.dll

多載

ObserveChanged(EventHandler<UIPasteboardChangeEventArgs>)	常數的 ChangedNotification 強型別通知。
ObserveChanged(NSObject, EventHandler<UIPasteboardChangeEventArgs>)	常數的 ChangedNotification 強型別通知。

ObserveChanged(EventHandler<UIPasteboardChangeEventArgs>)

常數的 ChangedNotification 強型別通知。

public static Foundation.NSObject ObserveChanged (EventHandler<UIKit.UIPasteboardChangeEventArgs> handler);

static member ObserveChanged : EventHandler<UIKit.UIPasteboardChangeEventArgs> -> Foundation.NSObject

參數

handler

EventHandler<UIPasteboardChangeEventArgs>

張貼通知時叫用的方法。

傳回

NSObject

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

下列範例示範開發人員如何在程式碼中使用此方法：

//
// Lambda style
//

// listening
notification = UIPasteboard.Notifications.ObserveChanged ((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.ObserveChanged (Callback);
}

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

ObserveChanged(NSObject, EventHandler<UIPasteboardChangeEventArgs>)

常數的 ChangedNotification 強型別通知。

public static Foundation.NSObject ObserveChanged (Foundation.NSObject objectToObserve, EventHandler<UIKit.UIPasteboardChangeEventArgs> handler);

static member ObserveChanged : Foundation.NSObject * EventHandler<UIKit.UIPasteboardChangeEventArgs> -> Foundation.NSObject

參數

objectToObserve

NSObject

要觀察的物件。

handler

EventHandler<UIPasteboardChangeEventArgs>

張貼通知時叫用的方法。

傳回

NSObject

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

這個方法可用來訂閱 ChangedNotification 通知。

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

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

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