Скачать или смотреть How to Dismiss Sheet from within NavigationLink in SwiftUI

Learn how to manage the dismissal of sheets in SwiftUI using NavigationLink. Follow our guide to effectively dismiss sheets from nested views!
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This video is based on the question https://stackoverflow.com/q/68424918/ asked by the user 'Isaak' ( https://stackoverflow.com/u/7399286/ ) and on the answer https://stackoverflow.com/a/68425028/ provided by the user 'jnpdx' ( https://stackoverflow.com/u/560942/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Dismiss Sheet from within NavigationLink in SwiftUI

SwiftUI has made the user interface development process smoother and more efficient. However, some challenges may arise when trying to manage sheet dismissals, especially within a NavigationLink. If you've ever found yourself in a situation where you want to dismiss a sheet from a deeper view, like moving from ViewTwo back to the main view, you're not alone!

In this guide, we'll walk through a common scenario where you might want to dismiss a sheet presented in a SwiftUI application when navigating from one view to another. Let’s break it down step by step.

The Problem

In SwiftUI, when you display a sheet, it's common to use a @ State variable to control its visibility. If your sheet contains a nested navigation structure, as in our example with ViewOne navigating to ViewTwo, the challenge arises: How do you dismiss the sheet while you're in ViewTwo?

You might initially try using presentationMode.wrappedValue.dismiss(), but this will typically just take you back to ViewOne, leaving the sheet still open. So, how can we solve this problem?

The Solution

The crux of the solution involves passing the sheet’s state variable down to the views that need to control it. By doing this, we create a Binding, allowing the inner views to update the outer state's visibility. Here’s how you can accomplish this:

Step 1: Update ContentView

Let’s start with the main view where the sheet is defined:

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Step 2: Modify ViewOne

Next, you need to accept a Binding parameter in ViewOne, so it can control the visibility of the sheet.

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

Step 3: Adjust ViewTwo

Finally, in ViewTwo, you can use the showParentSheet binding to dismiss the sheet directly:

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

Key Takeaways

State Management: By passing the @ State variable down to nested views as a @ Binding, you grant those views the ability to change the state of the sheet directly.

Simplified Dismissal: Instead of manipulating the presentation mode, just update the showParentSheet binding to control whether the sheet is visible.

Navigation: This technique works seamlessly regardless of whether you're on macOS or iOS, simplifying sheet handling in nested navigational structures.

Conclusion

Dismissing sheets in SwiftUI can be straightforward once you understand how to leverage state management through bindings. By applying the techniques we've discussed, you'll be well-equipped to handle sheet dismissals from any nested view confidently. Happy coding!