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Learn how to handle dynamic font sizes in SwiftUI while using variable fonts. Ensure accessibility and adaptability in your app's text presentation.
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This video is based on the question https://stackoverflow.com/q/76640158/ asked by the user 'Tyler D.' ( https://stackoverflow.com/u/12368760/ ) and on the answer https://stackoverflow.com/a/76640550/ provided by the user 'Mojtaba Hosseini' ( https://stackoverflow.com/u/5623035/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Implementing Dynamic Font Sizes with Variable Fonts in SwiftUI

Upgrading an app from UIKit to SwiftUI can be an exhilarating yet challenging journey, especially when it comes to handling text display. One common issue developers face is how to create a Text view in SwiftUI that not only reacts to dynamic font sizes—enhancing accessibility—but also utilizes variable font files. In this post, we will break down the solution to this common problem, ensuring your app remains adaptable and user-friendly.

The UIKit Approach

In UIKit, you typically manage dynamic fonts using the UIFontDescriptor. Here’s a quick glance at how this is done with a custom font:

[[See Video to Reveal this Text or Code Snippet]]

In this example:

We create a custom font using UIFontDescriptor.

The UIFontMetrics APIs help apply dynamic sizing based on system text settings, allowing the font size to scale according to user preferences.

When you add a UILabel configured this way to your screen, it adopts the variable font with the specified weight and scales dynamically with the user's text size preferences.

Moving to SwiftUI

When transitioning to SwiftUI, you might expect similar behavior. However, the approach you used in UIKit won't work seamlessly with SwiftUI’s Text view.

Initially, you might try something like this:

[[See Video to Reveal this Text or Code Snippet]]

But this implementation fails to respond to dynamic text size.

Recommended SwiftUI Approach

Apple recommends the following method to set a custom font:

[[See Video to Reveal this Text or Code Snippet]]

While this is a valid solution, it does not support the adjustments needed for variable fonts with modified font axis attributes.

The Solution: Using ScaledMetric

To achieve both variable font formatting and dynamic font sizing in SwiftUI, you can utilize the ScaledMetric property wrapper. This allows a variable to adapt based on the user's selected text size. Here’s how to implement it:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Solution

Declare ScaledMetric: This defines a variable (dynamicSize) that automatically scales based on the user's dynamic type settings.

Create Custom Font: Use your previously defined customFont but now apply the dynamicSize to ensure it responds to user-selected text sizes.

Render the Text View: Finally, render your text with Text using the custom font.

Conclusion

Switching from UIKit to SwiftUI doesn't have to compromise your font handling, especially when it comes to accessibility. By leveraging ScaledMetric, you can implement variable fonts alongside dynamic sizing, ensuring your app remains both visually appealing and user-friendly. Taking these steps will make your applications more adaptable to various user preferences, enhancing the overall user experience.



By following this guide, you can successfully implement Dynamic Font Sizes with variable fonts in SwiftUI, ensuring that your app's text rendering is both flexible and accessible. Happy coding!