Protocols in Swift

Protocols are extremely important in Swift

A protocol allows objects, and provide a concrete implementation of any object that conforms to it. We can think of a protocol as a set of rules and guidelines that an object can conform to

For the examples, read on.

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Difficulty: Beginner | Easy | Normal | Challenging

Prerequisites:

• Be able to produce a “Hello, World!” iOS application (guide HERE)
• Use of extensions (guide HERE)
• Some knowledge of Object-oriented programming, specifically overriding (guide HERE)

Terminology

class: An object defined in Swift, using pass by reference semantics

conforms: conformance is if an object adopts a protocol (or inherits it from another class) and contains the functionality specified

enum: A type consisting of a set of named values, called members

extensions: Extensions add new functionality to a class, struct, enum or protocol

inheritance: The mechanism in which one class acquires the property of another class

method: A group of statements that together can perform a function