Localization and Internationalization in SwiftUI Apps

In the globalized world of app development, catering to a diverse audience is essential. Localization and internationalization are the key to making your SwiftUI app accessible and user-friendly to people from various regions and cultures. In this article, we’ll explore the concepts of localization and internationalization in SwiftUI and how to implement them effectively.

Understanding Localization and Internationalization

Before delving into SwiftUI specifics, let’s clarify the terminology:

  • Localization is the process of adapting your app’s content to a specific locale or language. This involves translating user interface elements, such as labels and buttons, into the preferred language of the user.
  • Internationalization is the process of designing your app to be adaptable to different languages and regions. It involves preparing your code and user interface for localization. Internationalized apps are ready for translation, allowing easy localization.

Localization in SwiftUI

SwiftUI simplifies the process of localization. Here are the steps to make your SwiftUI app multilingual:

1. Prepare Your Project

Before you can localize your SwiftUI app, you need to prepare the Xcode project. Go to the project settings, and under the Info tab, add the languages you want to support.

2. Use Localized Strings

Instead of hardcoding text in your views, use localized strings. In SwiftUI, you can use the Text view with a localized key.


In your Localizable.strings file, you’ll have entries like:

"welcome_message" = "Welcome to our app";

3. Localize Images and Assets

Images and assets can also be localized. You can create asset catalogs for different languages and regions.

4. Test Localization

Use the Xcode Preview to test how your app appears in different languages. Ensure that text doesn’t overflow or get cut off.

Internationalization in SwiftUI

To prepare your SwiftUI app for internationalization, follow these best practices:

1. Use Auto Layout and Flexible UI

Make your UI flexible to accommodate text of different lengths when translated. Use SwiftUI’s layout tools to create responsive designs.

2. Avoid Hardcoding Constraints

Instead of hardcoding frame sizes and positions, rely on SwiftUI’s layout system to adapt to content.

3. Consider Right-to-Left (RTL) Languages

Some languages are read from right to left. Ensure your app supports RTL layouts when needed.

4. Dates, Numbers, and Units

Be aware that date formats, numeric separators, and units of measurement can vary by region. Use DateFormatter and NumberFormatter to format data accordingly.

5. Pluralization

Pluralization is an important aspect of localization. Different languages have varying rules for plurals. For example, in English, you might have:

"apple_count" = "You have %d apple";
"apple_count" = "You have %d apples";

In your SwiftUI code:

Text(String.localizedStringWithFormat(NSLocalizedString("apple_count", comment: ""), appleCount))

6. Localizing SwiftUI Buttons

You can also localize button labels in SwiftUI. Use the Text view as the label for your button and apply localization.

Button(action: {}) {

In Localizable.strings:

"buy_now" = "Buy Now";

7. Handling Bidirectional Text

For languages that read from right to left, SwiftUI provides tools to handle bidirectional text correctly. You can use the .environment(\.layoutDirection, .rightToLeft) modifier to switch the layout direction dynamically.

NavigationView {
    Text("Hello, World!")
        .environment(\.layoutDirection, .rightToLeft)

8. Supporting Different Date Formats

When dealing with dates, you should consider different date formats based on regions. You can create a custom DateFormatter and set it according to the user’s locale.

let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .medium
dateFormatter.timeStyle = .short
dateFormatter.locale = Locale.current
let formattedDate = dateFormatter.string(from: Date())


Localization and internationalization are essential for creating apps that can reach a global audience. SwiftUI makes the process straightforward, enabling developers to build apps that speak the language of their users.

By understanding these concepts and implementing them effectively in your SwiftUI app, you can provide a more inclusive and user-friendly experience for people around the world. Whether you’re a solo developer or part of a team, embracing localization and internationalization is a step toward making your app accessible to a diverse, global audience.

In summary, localization and internationalization in SwiftUI empower developers to create apps that transcend language barriers and cultural differences, offering a truly global user experience.

A pat on the back !!