Скачать или смотреть How to Save Language Selection in SwiftUI for Optimal User Experience

Learn how to effectively save a selected language in SwiftUI, allowing users to retain their preferences seamlessly.
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This video is based on the question https://stackoverflow.com/q/69701999/ asked by the user 'Lucky' ( https://stackoverflow.com/u/16784881/ ) and on the answer https://stackoverflow.com/a/69702281/ provided by the user 'workingdog support Ukraine' ( https://stackoverflow.com/u/11969817/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Implementing Language Selection Persistence in SwiftUI

In today’s guide, we will tackle a common issue that many SwiftUI developers face: saving a user's language selection when navigating through your application. It’s essential for enhancing user experience, as users expect their preferences to persist even after leaving the selection screen. If you've implemented a language selection UI but found that clicking the "Save" button doesn't retain the user's choice, you're in the right place.

The Problem Statement

You have designed a SwiftUI application where users can select a language from a list. However, after they select and save their choice, it is not displayed when they return to the previous page. This can lead to frustration for users as they need to re-select the language every time they enter the settings.

Solution Overview

To solve this problem, we need to implement a few straightforward changes to our existing code. The key is to use SwiftUI's @ State and @ Binding properties correctly to ensure that the selected language is saved and displayed when returning to the previous view.

Understanding the Existing Structure

Here’s an outline of the current setup your application uses for language selection:

ContentView: This is the main view where the language is initially displayed.

LanguageView: This view allows users to select a language and save that selection.

CustomLanguageView: A subview that displays the list of available languages.

SelectionCell: Represents each option in the language selection.

Key Changes Required

Let’s dive into the modifications required to ensure the language setting is saved correctly:

1. Use @ State in ContentView

Change the declaration of the language variable in ContentView to use @ State instead of using a plain variable. This allows the language value to persist and provide a binding for other views.

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2. Modify Navigation Logic

Ensure that the LanguageView receives the language as a binding so that any changes made can reflect back in the ContentView straight away.

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3. Update LanguageView

Inside the LanguageView, also make sure you're using the @ Binding correctly. By binding the language directly, any updates will be retained:

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When the "Save" button is clicked, just dismiss the view, without reassigning the language value within LanguageView. This is already handled directly since it is bound to ContentView.

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Final Implementation

Here’s the complete and revised code that incorporates all the changes we discussed:

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Conclusion

By employing @ State and @ Binding in your SwiftUI views, you can ensure that user selections like language preferences are effectively saved and displayed throughout your app. This leads to a smoother and more engaging user experience, keeping your users happy and coming back. So, next time you build a preference setting, remember these key steps to simplify your implementation!

If you run into any issues, feel free to reach out for more guidance or share your experiences with SwiftUI development.