GO FURTHER, FASTER: Try the Swift Career Accelerator today! >>

Creating your own classes

Classes are similar to structs in that they allow you to create new types with properties and methods, but they have five important differences and I’m going to walk you through each of those differences one at a time.

The first difference between classes and structs is that classes never come with a memberwise initializer. This means if you have properties in your class, you must always create your own initializer.

For example:

class Dog {
    var name: String
    var breed: String

    init(name: String, breed: String) {
        self.name = name
        self.breed = breed
    }
}

Creating instances of that class looks just the same as if it were a struct:

let poppy = Dog(name: "Poppy", breed: "Poodle")
Hacking with Swift is sponsored by RevenueCat.

SPONSORED Take the pain out of configuring and testing your paywalls. RevenueCat's all new Paywall Editor allow you to remotely configure your paywall view without any code changes or app updates.

Click to save your free spot now

Sponsor Hacking with Swift and reach the world's largest Swift community!

BUY OUR BOOKS
Buy Pro Swift Buy Pro SwiftUI Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Interview Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let us know!

Average rating: 4.6/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.