NSUbiquitousKeyValueStore.Notifications.ObserveDidChangeExternally 方法

定义

命名空间:

Foundation

程序集:

Xamarin.iOS.dll

重载

ObserveDidChangeExternally(EventHandler<NSUbiquitousKeyValueStoreChangeEventArgs>)	常量的强类型通知 DidChangeExternallyNotification 。
ObserveDidChangeExternally(NSObject, EventHandler<NSUbiquitousKeyValueStoreChangeEventArgs>)	常量的强类型通知 DidChangeExternallyNotification 。

ObserveDidChangeExternally(EventHandler<NSUbiquitousKeyValueStoreChangeEventArgs>)

常量的强类型通知 DidChangeExternallyNotification 。

public static Foundation.NSObject ObserveDidChangeExternally (EventHandler<Foundation.NSUbiquitousKeyValueStoreChangeEventArgs> handler);

static member ObserveDidChangeExternally : EventHandler<Foundation.NSUbiquitousKeyValueStoreChangeEventArgs> -> Foundation.NSObject

参数

handler

EventHandler<NSUbiquitousKeyValueStoreChangeEventArgs>

发布通知时调用的方法。

返回

NSObject

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 = 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 ();
}

ObserveDidChangeExternally(NSObject, EventHandler<NSUbiquitousKeyValueStoreChangeEventArgs>)

常量的强类型通知 DidChangeExternallyNotification 。

public static Foundation.NSObject ObserveDidChangeExternally (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSUbiquitousKeyValueStoreChangeEventArgs> handler);

static member ObserveDidChangeExternally : Foundation.NSObject * EventHandler<Foundation.NSUbiquitousKeyValueStoreChangeEventArgs> -> Foundation.NSObject

参数

objectToObserve

NSObject

要观察的对象。

handler

EventHandler<NSUbiquitousKeyValueStoreChangeEventArgs>

发布通知时调用的方法。

返回

NSObject

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 DidChangeExternallyNotification 通知。

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

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

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