Solving the SwiftUI ProgressView Not Updating Trick

Описание: Are you having trouble with your `SwiftUI ProgressView` not updating? Discover the solution to effectively update your progress view in Swift!
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This video is based on the question https://stackoverflow.com/q/72184562/ asked by the user 'Gurkenkr4ll3' ( https://stackoverflow.com/u/19084633/ ) and on the answer https://stackoverflow.com/a/72184896/ provided by the user 'Alexander Sandberg' ( https://stackoverflow.com/u/780291/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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SwiftUI ProgressView Not Updating? Here's How to Fix It!

If you’re diving into SwiftUI and experimenting with ProgressView, it's not uncommon to encounter some hiccups along the way. One such challenge that developers often face is when the progress value of a ProgressView fails to update upon user interaction, particularly within a button closure. This issue can be quite frustrating, especially as you’re trying to provide real-time feedback to your users. In this guide, we'll unravel this problem and guide you through the solution step-by-step.

The Problem: Progress Not Updating

Imagine you're building an application where you want to display a progress view indicating how many items are left in a list. Using Swift Playgrounds on iPad or a larger Xcode project, you might use code similar to the following:

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

In this scenario, you expect the progress to update as users click the "Next" button. However, if the ProgressView won't update, it can lead to confusion about how many items remain.

The Root of the Problem

At the heart of the issue lies the way you're calculating the progress value. Specifically, this line:

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

The problem here is that 1 / names.count gives an integer division. In Swift, when you divide two integers, you end up with an integer result. Therefore, unless names.count is 1, this will always return 0 when it’s less than 1. As a result, your progress variable remains 0, resulting in a static ProgressView that never updates.

The Solution: Update Your Calculation

To fix the issue and ensure the ProgressView updates correctly, we need to convert names.count to a Double before performing the division. The corrected line of code should look like this:

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

Implementing the Fix

Now, let's take a look at the corrected version of your ContentView:

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

Conclusion

By simply changing the way you calculate the value of progress, you can easily make your ProgressView function as intended. Remember, converting values properly in Swift can save you from unexpected behavior. Now your users will receive instant feedback on their progress, creating a more dynamic and engaging experience!

Happy coding!