How to use Extension in ios – iOS development for beginners – Latest tutorials 2022

Extensions add new functionality to an existing class, structure, enumeration, or protocol type. This includes the ability to extend types for which you don’t have access to the original source code (known as retroactive modeling). Extensions are similar to categories in Objective-C. (Unlike Objective-C categories, Swift extensions don’t have names.)

Extensions in Swift can:

Add computed instance properties and computed type properties

Define instance methods and type methods

Provide new initializers

Define subscripts

Define and use new nested types

Make an existing type conform to a protocol

In this free full course on Swift you’ll learn all of the basics of the Swift programming language. After taking this course you’ll be able to start learning iOS development and build your very own apps.

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