", user presses a button) A controller contains the input part of the user interface. The controller accesses the model, possibly updating it in a way appropriate to the user's action (e . g. , controller updates user's shopping cart) A view uses the model to generate an appropriate user interface (e. g. , view produces a screen listing the shopping cart contents). The view gets its own data from the model (or direct from the data access layer - sometimes there is no domain logic to do). Model Portfolio Senior The model should have no direct knowledge of the view. However, the observer pattern can be used to provide some indirection between model and view, allowing the model to notify interested parties of a change. "

" Many applications use a persistent storage mechanism (such as a database) to store data. MVC does not specifically mention this data access layer. It's common to think of an application as having three main layers: presentation (UI), domain,and data access. In MVC, the presentation layer is split into controller and view. The most important separation is between presentation and domain. The V/C split less so. Though MVC comes in different flavors, control flow generally works as follows: The user interacts with the user interface in some way (e. Model Portfolio Female Professional Modeling Photographyg. , user presses a button) A controller contains the input part of the user interface. "