NSUbiquitousKeyValueStore.DidChangeExternallyNotification 屬性

定義

命名空間:

Foundation

組件:

Xamarin.iOS.dll

DidChangeExternally 的通知常數

[Foundation.Advice("Use NSUbiquitousKeyValueStore.Notifications.ObserveDidChangeExternally helper method instead.")]
[Foundation.Field("NSUbiquitousKeyValueStoreDidChangeExternallyNotification", "Foundation")]
public static Foundation.NSString DidChangeExternallyNotification { get; }

member this.DidChangeExternallyNotification : Foundation.NSString

屬性值

NSString

NSString 常數應該用來做為 NSNotificationCenter 的權杖。

屬性

AdviceAttribute FieldAttribute

備註

這個常數可以搭配 使用 NSNotificationCenter ，以註冊此通知的接聽程式。 這是 NSString 而非字串，因為這些值可以當做某些原生程式庫中的權杖使用，而不是單純用於其實際字串內容。 回呼的 'notification' 參數包含通知類型特有的額外資訊。

若要訂閱此通知，開發人員可以使用方便 NSUbiquitousKeyValueStore.Notifications 的 。 ObserveDidChangeExternally 方法可提供通知參數的強型別存取。

下列範例示範如何使用強型別的 Notifications 類別，來排除通知中可用屬性的猜測：

//
// Lambda style
//

// listening
notification = NSUbiquitousKeyValueStore.Notifications.ObserveDidChangeExternally ((sender, args) => {
    /* Access strongly typed args */
    Console.WriteLine ("Notification: {0}", args.Notification);

    Console.WriteLine ("ChangedKeys", args.ChangedKeys);
    Console.WriteLine ("ChangeReason", args.ChangeReason);
});

// To stop listening:
notification.Dispose ();

//
// Method style
//
NSObject notification;
void Callback (object sender, Foundation.NSUbiquitousKeyValueStoreChangeEventArgs args)
{
    // Access strongly typed args
    Console.WriteLine ("Notification: {0}", args.Notification);

    Console.WriteLine ("ChangedKeys", args.ChangedKeys);
    Console.WriteLine ("ChangeReason", args.ChangeReason);
}

void Setup ()
{
    notification = NSUbiquitousKeyValueStore.Notifications.ObserveDidChangeExternally (Callback);
}

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

下列範例示範如何搭配 DefaultCenter API 使用通知：

// Lambda style
NSNotificationCenter.DefaultCenter.AddObserver (
        NSUbiquitousKeyValueStore.DidChangeExternallyNotification, (notification) => {Console.WriteLine ("Received the notification NSUbiquitousKeyValueStore", notification); }


// Method style
void Callback (NSNotification notification)
{
    Console.WriteLine ("Received a notification NSUbiquitousKeyValueStore", notification);
}

void Setup ()
{
    NSNotificationCenter.DefaultCenter.AddObserver (NSUbiquitousKeyValueStore.DidChangeExternallyNotification, Callback);
}