IObserver

public protocol IObserver

The interface definition for a PureMVC Observer.

In PureMVC, IObserver implementors assume these responsibilities:

  • Encapsulate the notification (callback) method of the interested object.
  • Encapsulate the notification context (self) of the interested object.
  • Provide methods for setting the interested object’ notification method and context.
  • Provide a method for notifying the interested object.

PureMVC does not rely upon underlying event models such as the one provided with Flash, and ActionScript 3 does not have an inherent event model.

The Observer Pattern as implemented within PureMVC exists to support event driven communication between the application and the actors of the MVC triad.

An Observer is an object that encapsulates information about an interested object with a notification method that should be called when an INotification is broadcast. The Observer then acts as a proxy for notifying the interested object.

Observers can receive Notifications by having their notifyObserver method invoked, passing in an object implementing the INotification interface, such as a subclass of Notification.

@see org.puremvc.swift.interfaces.IView IView

@see org.puremvc.swift.interfaces.INotification INotification

  • Set the notification method.

    The notification method should take one parameter of type INotification

    Declaration

    Swift

    var notifyMethod: ((_ notification: INotification) -> ())? { get set }

    Parameters

    notifyMethod

    the notification (callback) method of the interested object

  • Get or set the notification context (self) of the interested object.

    Declaration

    Swift

    var notifyContext: AnyObject? { get set }

  • Notify the interested object.

    Declaration

    Swift

    func notifyObserver(_ notification: INotification)

    Parameters

    notification

    the INotification to pass to the interested object’s notification method

  • Compare the given object to the notificaiton context object.

    Declaration

    Swift

    func compareNotifyContext(_ object: AnyObject) -> Bool

    Parameters

    object

    the object to compare.

    Return Value

    boolean indicating if the notification context and the object are the same.