What is ViewController life cycle and explain the methods in detail?

iOS View Controller Life manages a set of views and makes your app’s user interface. It coordinates with model objects and other controller objects. The views are automatically loaded when the view property of the view controller is accessed in the app. A View Controller provides multiple methods for manage the views.

What is iOS life cycle?

Every iOS application passes through the following states as it runs. Not Running: the app is considered to be in a Not Running state when it is not yet launched or terminated by the system or user. Inactive: the app is in an inactive state when it is in the foreground but receiving events.

What is UIViewController in iOS?

A UIViewController is an object which manages the view hierarchy of the UIKit application. The UIViewController defines the shared behavior and properties for all types of ViewController that are used in the iOS application. The UIViewController class inherits the UIResponder class.

What does iOS application lifecycle consist of?

Background — An application is running in the background and executing the code. Freshly launching apps directly enter into In-Active state and then to Active state. Apps that are suspended, will come back to this background state, and then transition to In-Active → Active states.

What is view life cycle?

View Life Cycle Every Activity has it’s own life cycle similarly Views also have a Life Cycle. A view which was rendered on the screen must undergo these lifecycle methods to get drawn on the screen correctly. Each of these methods has its importance. Let’s dive into the life cycle.

Which is the first method called when view controller is loaded?

viewDidLoad
viewDidLoad: This Method is loaded once in view controller life cycle . Its Called When all the view are loaded .

How many states are in iOS life cycle?

five states
The five states of an iOS app – as listed in the iOS App Programming Guide – include the following: Non-running – The app is not running. Inactive – The app is running in the foreground, but not receiving events.

What is UI responder?

An abstract interface for responding to and handling events.

What is the app life cycle?

In most cases, every Android application runs in its own Linux process. This process is created for the application when some of its code needs to be run, and will remain running until it is no longer needed and the system needs to reclaim its memory for use by other applications.

How do you make a ViewModel lifecycle aware?

Best practices for lifecycle-aware components

1. Keep your UI controllers (activities and fragments) as lean as possible.
2. Try to write data-driven UIs where your UI controller’s responsibility is to update the views as data changes, or notify user actions back to the ViewModel .
3. Put your data logic in your ViewModel class.