What is the difference between View and controller?

The view renders presentation of the model in a particular format. The controller responds to the user input and performs interactions on the data model objects. The controller receives the input, optionally validates it and then passes the input to the model.

What is the difference between view and controller in MVC?

Model: The backend that contains all the data logic. View: The frontend or graphical user interface (GUI) Controller: The brains of the application that controls how data is displayed.

What is the difference between view and Viewcontroller iOS?

a view is just what the screen looks like. views just get displayed and thats it. a view controller is what manages and controls views. it has one main view and that main view has many subviews such as buttons and labels.

What is the difference between ViewModel and controller in MVVM?

In MVVM a ViewModel is an abstract representation of the View and does not know the concrete UI, it wraps the Model in a way so that it can be displayed as desired. In classical MVC, a controller is just a strategy of the View to interact with the Model. In fact, sometimes a Controller isn't even necessary.

Is a Viewcontroller a view?

A view controller manages a single root view, which may itself contain any number of subviews. User interactions with that view hierarchy are handled by your view controller, which coordinates with other objects of your app as needed. Every app has at least one view controller whose content fills the main window.

Model View Controller (MVC) vs Model View Template (MVT) Difference in Process Model

What is the primary role of a view controller?

The most important role of a view controller is to manage a hierarchy of views. Every view controller has a single root view that encloses all of the view controller's content. To that root view, you add the views you need to display your content.

Why is view controller important?

The controller also helps to decouple the presentation components (views) from the business operations, further aiding development. Web applications are considered stateless because the browser doesn't maintain a constant open connection to the web server.

What is difference between ViewModel and controller?

Controller – code that cares about how data is created/updated/deleted. ViewModel – code that cares both about how data is stored and how it is displayed.

How is ViewModel different from controller?

The ViewModel is a Pattern used to handle the presentation logic and state of the View and the controller is one of the fundamentals parts of any MVC framework, it responds to any http request and orchestrates all the subsequent actions until the http response.

What is the difference controller and ViewModel?

Model–view–controller (MVC) is a software architectural pattern for implementing user interfaces on computers. View is a user interface. View displays data from the model to the user and also enables them to modify the data. Controllers are responsible for controlling the flow of the application execution.

What are the different types of view controllers?

There are two types of ViewControllers: Content ViewController: Content ViewControllers are the main type of View Controllers that we create. The Content View Controllers holds the content of the Application screen.

How does MVC work in iOS?

The view layer and the model layer are glued together by one or more controllers. In iOS and tvOS applications, for example, that glue is a view controller, an instance of the UIViewController class or a subclass thereof. A controller knows about the view layer as well as the model layer.

What is difference between Array and NSArray in iOS?

Array is a struct, therefore it is a value type in Swift. NSArray is an immutable Objective C class, therefore it is a reference type in Swift. An array can store one type of data, whereas NSArray can hold different types of data. There are three types of arrays in Swift − Array, NSArray and NSMutableArray.

What is the relationship between model view and controller?

The view is only about display of information; any changes to the information are handled by the third member of the MVC trinity: the controller. The controller takes user input, manipulates the model, and causes the view to update appropriately. In this way UI is a combination of the view and the controller.

What is the purpose of controller in MVC?

A controller is responsible for controlling the way that a user interacts with an MVC application. A controller contains the flow control logic for an ASP.NET MVC application. A controller determines what response to send back to a user when a user makes a browser request.

What are two advantages of the model view controller?

What is the purpose of a ViewModel?

The purpose of the ViewModel is to acquire and keep the information that is necessary for an Activity or a Fragment. The Activity or the Fragment should be able to observe changes in the ViewModel. ViewModels usually expose this information via LiveData or Android Data Binding.

What is ViewModel used for?

In ASP.NET MVC, ViewModel is a class that contains the fields which are represented in the strongly-typed view. It is used to pass data from controller to strongly-typed view.

What is the benefit of ViewModel?

The ViewModel class is designed to hold and manage UI-related data in a life-cycle conscious way. This allows data to survive configuration changes such as screen rotations. ViewModels separate UI implementation from your app's data.

Is controller same as API?

They work similarly in Web API, but controllers in Web API derive from the ApiController class instead of Controller class. The first major difference you will notice is that actions on Web API controllers do not return views, they return data. ApiControllers are specialized in returning data.

When would you use a model view controller?

Basically, MVC serves well when you have an application that needs separation of the data(model), the data crunching(controller), and the presentation of the data(view). This also serves well in an application where the data source and/or data presentation can change at any time.

What is model view and controller in Java?

The Model-View-Controller (MVC) is a well-known design pattern in the web development field. It is way to organize our code. It specifies that a program or application shall consist of data model, presentation information and control information.

How do you communicate between View and controller?

Can a controller have multiple views?

Controller is the boss, so a Controller decides which View to be rendered and Views does not / cannot care which Controller requested the View. You can / will absolutely have multiple Views from a Controller.

How many view controllers should I have?

I know that many developers have a single View Controller for every screenful of content, but actually the answer is 8. This is one of the things you can do to make your app more composable and decoupled: use child view controllers. It's a very simple, but powerful technique.