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Discover how to resolve the issue of `ProgressView` not showing up in SwiftUI by restructuring your code effectively. Get step-by-step insights!
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This video is based on the question https://stackoverflow.com/q/73001026/ asked by the user 'Nazar' ( https://stackoverflow.com/u/3071003/ ) and on the answer https://stackoverflow.com/a/73001381/ 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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How to Fix the Issue of ProgressView Not Displaying in SwiftUI

When working with SwiftUI, it can be frustrating to see that your UI components are not behaving as expected. One common issue developers face is when a ProgressView does not appear after a button press, despite the expectation that it should. This situation typically arises due to how the @ Published properties are structured and accessed within the views. In this guide, we'll break down the problem, explore the root cause, and then provide a robust solution that will ensure your ProgressView displays correctly.

The Problem: ProgressView Not Showing

You have a LoginView where a button triggers the display of a ProgressView. Here's a simplified version of your current implementation:

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

What’s Wrong?

The issue arises from using nested ObservableObject properties (User and Login) with @ Published variables. When you are updating showLoginProgress, the entire structure does not notify the LoginView to refresh, causing the ProgressView not to show up when expected.

A Solution: Restructuring Your Code

To solve this problem, you should simplify your architecture by having a single ObservableObject that manages all user-related states, including the login progress. Below is a recommended code structure.

The Revised Code Structure

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

Key Changes Explained

Single ObservableObject: By consolidating state management into UserManager, we streamline the properties and their notifications. Now, all relevant information is in one place, making it easier to manage and observe changes.

Using @ StateObject: In ContentView, we define UserManager as a @ StateObject, which ensures that it is owned by the view and persists its state.

Login Logic Encapsulation: The doLogin function now handles both the login process and the progress display without needing to dive into nested property changes.

Conclusion

When you encounter issues in SwiftUI where views don't update as expected, analyzing the structure of your ObservableObject relationships can often lead to a solution. By following the approach outlined above, you can ensure that your ProgressView works seamlessly and enhances the user experience during login operations.

With this newfound understanding, you’ll be able to tackle similar issues in your SwiftUI projects effectively. Happy coding!