Скачать или смотреть How to Fix SwiftUI Picker Value Not Updating in Settings View

Learn how to resolve the issue of a SwiftUI Picker value not updating correctly in a Settings view. This step-by-step guide will provide you with a simplified and effective solution for your SwiftUI apps.
---
This video is based on the question https://stackoverflow.com/q/63948199/ asked by the user 'Dogahe' ( https://stackoverflow.com/u/912893/ ) and on the answer https://stackoverflow.com/a/63948686/ provided by the user 'Asperi' ( https://stackoverflow.com/u/12299030/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Value of Selected Option From a SwiftUI Picker does not Update the View

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Fix SwiftUI Picker Value Not Updating in Settings View

When building SwiftUI applications, developers may encounter situations where the selected value in a Picker does not reflect changes instantly in its corresponding view, especially within a settings context. In this guide, we’ll explore a common scenario where this problem occurs and provide a clear, organized solution.

Understanding the Problem

Imagine you have a Settings view where a user can select a setting from a Picker. You may have set up your app architecture using an ObservableObject to hold these settings. However, after navigating to the Settings view, you notice that even though the selected value reflects correctly in your ContentView, it doesn’t update properly within the Picker itself upon selection in SettingsView.

Example Structure:

You have a Settings class that holds an ObservableObject.

A FirstLevel enum contains the settings options (like even and odd).

The ContentView displays the selected setting but the SettingsView Picker fails to show the updated selection correctly after the first interaction.

The Solution

A more efficient way to code this scenario is by simplifying how we manage the ObservableObject in relation to views, especially those presented in sheets. Here’s how you can refactor your code for better results.

Step 1: Update Settings Class

Make sure your Settings class is an ObservableObject with a @ Published property that the Picker can reflect changes from.

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

Step 2: Refactor ContentView

In your ContentView, utilize the observed settings directly without binding while ensuring you still show the Settings button.

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

Step 3: Implement the Settings Button

Notice that we still manage the state for the presentation of the settings screen but pass the settings object directly to the SettingsView.

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

Step 4: Create the Settings View

In SettingsView, simply observe the settings directly. This will ensure that any changes made in this view are applied to the shared settings object.

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

Conclusion

In this guide, we discussed how to resolve the issue of a SwiftUI Picker value not updating correctly in its settings view. By adopting a clearer structure that effectively uses ObservableObject and managing the state accordingly, we can ensure a smoother user experience in our SwiftUI applications.

Follow these steps to enhance your app functionality and eliminate confusion when dealing with multiple views and settings selections!