The Model-View-Controller (MVC) design pattern assigns objects in an application one of three roles mainly: model, view, or controller. The pattern defines not only the roles objects play in the application, it defines the way of objects communicate with the each other. Each of the three types of objects is separated from the others by abstract boundaries and communicates with objects of the other types across those boundaries. The collection of objects of certain MVC type in an application is sometimes referred to as a layer like a model layer.
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Communication : User actions in the view layer that create or modify data are communicated through a controller object and result in the creation or updating of a model object. When a model object changes (for example:- new data is received over a network connection), it is notifies a controller object, which are updates the appropriate view objects.
Communication : View objects learn about the changes in model data through the application’s controller objects and communicate user-initiated changes—for example, text entered in a text field—through controller objects to an application’s model objects.
Communication : A controller object interprets user actions made in view objects and communicates new or changed data to the model layer. When model objects can change, a controller object communicates that new model data to the view objects so that they can display it.