共用方式為


MPMusicPlayerControllerQueue.Notifications.ObserveDidChange 方法

定義

多載

ObserveDidChange(EventHandler<NSNotificationEventArgs>)

常數的 DidChangeNotification 強型別通知。

ObserveDidChange(NSObject, EventHandler<NSNotificationEventArgs>)

常數的 DidChangeNotification 強型別通知。

ObserveDidChange(EventHandler<NSNotificationEventArgs>)

常數的 DidChangeNotification 強型別通知。

public static Foundation.NSObject ObserveDidChange (EventHandler<Foundation.NSNotificationEventArgs> handler);
static member ObserveDidChange : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject

參數

handler
EventHandler<NSNotificationEventArgs>

張貼通知時叫用的方法。

傳回

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 DidChangeNotification 通知。

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

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

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

適用於

ObserveDidChange(NSObject, EventHandler<NSNotificationEventArgs>)

常數的 DidChangeNotification 強型別通知。

public static Foundation.NSObject ObserveDidChange (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);
static member ObserveDidChange : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject

參數

objectToObserve
NSObject

要觀察的物件。

handler
EventHandler<NSNotificationEventArgs>

張貼通知時叫用的方法。

傳回

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 DidChangeNotification 通知。

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

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

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

適用於