NEW! Master Swift design patterns with my latest book! >>

How to use Dynamic Type to resize your app's text

Paul Hudson       @twostraws

As of iOS 7.0 users can set a system-wide preferred font size for all apps, but many programmers ignore this setting much to user's annoyance. You're not one of those developers, are you? Of course not! So here's how to honor a user's font settings using UIFont:

let headlineFont = UIFont.preferredFont(forTextStyle: UIFontTextStyle.headline)
let subheadFont = UIFont.preferredFont(forTextStyle: UIFontTextStyle.subheadline)

And that's it! This technology is called Dynamic Type, and it's powerful because that code will return correctly sized fonts for the user's preference, which means your app's text will shrink or grow as needed.

Note that it is technically possible for users to change their Dynamic Type setting while your app is running. If you want to cover this corner case, use NotificationCenter to subscribe to the UIContentSizeCategoryDidChange notification then refresh your user interface if you receive it.

Available from iOS 7.0 – see Hacking with Swift tutorial 32

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Love Hacking with Swift?

Get all 40 projects in PDF and HTML: buy the Hacking with Swift book! It contains over 1300 pages of hands-on Swift coding, and will really help boost your iOS career

MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>