NEW: Start my new Ultimate Portfolio App course with a free Hacking with Swift+ trial! >>

Static properties and methods

All the properties and methods we’ve created so far have belonged to individual instances of structs, which means that if we had a Student struct we could create several student instances each with their own properties and methods:

struct Student {
    var name: String

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

let ed = Student(name: "Ed")
let taylor = Student(name: "Taylor")

You can also ask Swift to share specific properties and methods across all instances of the struct by declaring them as static.

To try this out, we’re going to add a static property to the Student struct to store how many students are in the class. Each time we create a new student, we’ll add one to it:

struct Student {
    static var classSize = 0
    var name: String

    init(name: String) {
        self.name = name
        Student.classSize += 1
    }
}

Because the classSize property belongs to the struct itself rather than instances of the struct, we need to read it using Student.classSize:

print(Student.classSize)
Hacking with Swift is sponsored by Fernando Olivares

SPONSORED Would you describe yourself as knowledgeable, but struggling when you have to come up with your own code? Fernando Olivares has a new book containing iOS rules you can immediately apply to your coding habits to see dramatic improvements, while also teaching applied programming fundamentals seen in refactored code from published apps.

Try the book!

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

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three 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 Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 4.8/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.