WWDC23 SALE: Save 50% on all my Swift books and bundles! >>

What is the @ScaledMetric property wrapper?

Paul Hudson    @twostraws   

Updated for Xcode 14.2

SwiftUI gives us the @ScaledMetric property wrapper to define numbers that should scale automatically according to the user’s Dynamic Type settings.

In its most basic usage, you give your property a default value and @ScaledMetric will do the rest. For example, this will draw the same picture at different sizes depending on the user’s settings:

struct ContentView: View {
    @ScaledMetric var imageSize = 100.0

    var body: some View {
        Image(systemName: "cloud.sun.bolt.fill")
            .frame(width: imageSize, height: imageSize)

If you need your scaling to match up against a specific other piece of text, you can use the relativeTo parameter for your property wrapper, which lets you specify what font size to match. For example, this will scale alongside the large title size:

@ScaledMetric(relativeTo: .largeTitle) var imageSize = 100.0
Save 50% in my WWDC23 sale.

SAVE 50% To celebrate WWDC23, all our books and bundles are half price, so you can take your Swift knowledge further without spending big! Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testing skills, and more.

Save 50% on all our books and bundles!

Similar solutions…

Buy Pro Swift Buy Pro SwiftUI 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 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 Beyond Code

Was this page useful? Let us know!

Average rating: 4.4/5

Unknown user

You are not logged in

Log in or create account

Link copied to your pasteboard.