Скачать или смотреть Solving the SwiftUI Modal Preview Challenge: How to Close Modals with a Button

Discover how to effectively preview modals in `SwiftUI` and close them with a button, even in preview mode!
---
This video is based on the question https://stackoverflow.com/q/65594072/ asked by the user 'dw96' ( https://stackoverflow.com/u/12794518/ ) and on the answer https://stackoverflow.com/a/65594279/ provided by the user 'Raja Kishan' ( https://stackoverflow.com/u/14733292/ ) 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: SwiftUI close modal with a button in preview mode

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.
---
Solving the SwiftUI Modal Preview Challenge: How to Close Modals with a Button

Using SwiftUI can sometimes lead to hurdles, especially when it comes to working with modals. A common challenge developers face is the inability to preview modals while trying to implement functionality to close them with a button. In this guide, we will explore this problem and provide a clear solution to help you visualize your modals effectively.

The Problem

You may find yourself in a situation where you want to present a modal (also known as a sheet) when a button is clicked, and control its dismissal using another button. While this may sound straightforward, maintaining a proper preview of your modal can be tricky.

Let's look at an example: You have a button that opens a modal, and the modal has a button to close it. While this works perfectly during regular runtime, figuring out how to display your modal in SwiftUI’s preview mode can leave you scratching your head — namely because it expects a Binding<Bool> value.

Example Code Snippet

Here is a typical implementation you might have:

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

You may notice that your SettingsView_Previews section is incomplete, specifically this line:

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

Here lies the crux of the issue — how do we provide a valid Binding<Bool> for the preview to work?

The Solution

The good news is that SwiftUI provides a straightforward API to tackle this issue. To enable your preview of the modal, you can use the Binding.constant() method. This method allows you to create a constant binding that works perfectly for preview purposes.

Implement the Solution

To implement the solution, modify your SettingsView_Previews section as follows:

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

Explanation

Binding.constant(true): By using this method, you can pass a constant value of true or false to fulfill the requirement of a Binding<Bool>. This allows you to preview the SettingsView without errors, even though it’s not tied to any state management in the preview.

Additional Notes

You can switch between true and false based on what you want to showcase in your preview.

This solution is not only neat but also paves the way for cleaner code by avoiding unnecessary boilerplate.

Conclusion

Previewing SwiftUI modals while offering the functionality to close them effectively should no longer be a daunting task. By utilizing Binding.constant() for your previews, you can seamlessly visualize your modal design and ensure that everything works perfectly in both runtime and preview modes.

Happy coding! With these tips, you should be ready to design and test your SwiftUI modals with confidence!