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Working with String Catalogs for App Localization in iOS 17

With the discharge of Xcode 15, Apple launched an thrilling function referred to as String Catalogs. This function goals to streamline the localization course of on your app, making it simpler to handle all of your strings in a single central location. By leveraging String Catalogs, you’ll be able to make sure that your app is absolutely localized earlier than it reaches your customers. This new function presents each comfort and confidence within the localization course of.

In earlier variations of Xcode, it’s a must to undergo a string internationalization course of that requires to switch the prevailing texts with the String(localized:) macro earlier than localization. Nevertheless, with the introduction of String Catalogs, this course of is not vital. For SwiftUI initiatives, String Catalogs robotically extracts all user-facing texts for you, eliminating the necessity for guide modifications.

Let’s create a easy mission and see how String Catalogs can simplify the localization course of on your SwiftUI app initiatives.

Constructing a Easy Demo for Localization

Assuming you’ve put in Xcode 15, create a brand new SwiftUI mission and substitute the code in ContentView like this:

It’s a quite simple login display for demo objective. In case you’ve written the code above, Xcode ought to present you the pattern login display within the preview pane.


Utilizing String Catalogs

By default, Xcode initiatives are configured to help solely the English language. If you wish to add help for a further language, first choose the mission file within the mission navigator. Then go to the Data tab and find the Localizations part. Click on the “+” button so as to add a brand new language. Subsequent, select your required language, akin to conventional Chinese language, from the accessible choices.


When you’ve accomplished these steps, your Xcode mission can have help for the chosen language, permitting for localization.

The String Catalog file isn’t bundled within the Xcode mission. Earlier than localization, it’s a must to manually create a String Catalog file. Within the mission navigator, right-click the mission folder and choose “New File…”. Underneath the iOS class, search for the String Catalog template. Click on Subsequent to proceed after which identify the file Localizable.


This course of generates an empty Localizable file that features all of the supported languages on your app. To extract all of the user-facing texts into this file, you’ll be able to comply with these steps: choose Product from the Xcode menu and select Construct to rebuild the mission. After the construct course of, Xcode will robotically extract all of the textual content and populate them within the Localizable file.


As soon as the texts are extracted, you’ll be able to proceed so as to add translations straight within the String Catalog file for every language. This lets you present localized variations of the textual content and make sure the app is correctly localized for various languages.

If you add new user-facing textual content in your mission, Xcode will robotically embody them within the String Catalog. This course of happens each time you construct the mission. It ensures that the newly added textual content is correctly managed and could be simply localized for various languages.

Testing the Localized App

There are a few methods to check the localization of your app. One method is to vary the language choice of the simulator after which run the localized app on it, permitting you to see how the app behaves in numerous languages. An alternative choice is to make the most of a preview function in Xcode that allows you to check your app in numerous languages and areas, each at runtime and in Interface Builder. Let’s discover these choices intimately.

To allow the preview at runtime function in Xcode, you’ll be able to modify the scheme sheet. Throughout the scheme settings, you’ll be able to set your most popular language within the dialog field, permitting you to preview how the app seems and capabilities in that particular language.


Within the dialog field, choose Run > Choices and alter the App language to your most popular language. For instance, Chinese language (Conventional). Click on the Shut button to avoid wasting the setting.


Now click on the Run button to launch the app; the language of the simulator ought to set to your most popular language. In case you’ve set it to Chinese language/German, your app ought to seem like the screenshot.


Testing the Localization Utilizing Preview

To preview the localization of a SwiftUI app, you’ll be able to make the most of the locale surroundings variable in your preview code. This lets you simulate the app UI in numerous languages. For instance, should you want to preview the app UI in Conventional Chinese language, you’ll be able to add a further preview code block with the specified locale settings. Right here’s an instance:

By setting the locale surroundings variable to .init(identifier: "zh-Hant"), you’ll be able to preview the app UI with Conventional Chinese language. You may modify the identifier to simulate different languages as wanted.

Including Remark to Your Textual content

Within the Localizable file, there’s a remark subject that shows the related remark for every key and translation. In case you want to add feedback for a particular key, you’ll be able to embody them when defining the Textual content view, like this:

When you modify the code with the remark, it’ll seem within the Localizable file.



On this tutorial, I’ve guided you thru the localization course of in Xcode. The introduction of String Catalogs in Xcode 15 has considerably simplified the workflow for builders. This new function automates the extraction of textual content from SwiftUI views and consolidates them right into a centralized file. Moreover, translators can conveniently edit the translations straight inside Xcode, streamlining the localization course of.

Observe: It is a pattern chapter (modified model) of the Mastering SwiftUI e-book.



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