Скачать или смотреть How to Make Tap Gestures Work Under a ScrollView in SwiftUI

Discover how to resolve tap gesture issues when using ScrollView in `SwiftUI`. Learn effective techniques to ensure your UI responds as expected.
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This video is based on the question https://stackoverflow.com/q/66501581/ asked by the user 'NikaE' ( https://stackoverflow.com/u/6402542/ ) and on the answer https://stackoverflow.com/a/66502147/ provided by the user 'ios coder' ( https://stackoverflow.com/u/13899957/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving Tap Gesture Issues Under ScrollView in SwiftUI

Introduction

When building user interfaces with SwiftUI, developers often encounter issues with gesture handling, particularly when using components like ScrollView. A common problem arises when you want to detect taps on elements that are visually under a ScrollView. In this guide, we will go through a specific situation where a tap gesture doesn’t work as intended due to the layering of views. We will also provide a clear solution to make those gestures functional.

The Problem

The challenge presented in our example is straightforward: we have a green background color that, when tapped, is supposed to trigger a print action. However, this is obstructed by a ScrollView containing a red view. The initial setup looks like this:

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

In this configuration, tapping on the green area does not trigger the gesture because the ScrollView sits on top of it, absorbing touch events.

The Solution: Restructuring the Views

To enable the tap gesture on the green view, we can make minor adjustments to our view hierarchy. Here’s a solution that involves adding a transparent overlay to capture the tap gesture while still allowing the ScrollView to operate correctly.

Restructured Code Implementation

Here’s how you can modify your code:

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

Breakdown of Changes

Transparent Tap Area: We added a Color.white view with an opacity of 0.01. This makes it almost invisible but still clickable. This layer captures tap gestures and calls the same function we assigned to the green view.

Maintaining the Scroll View: The ScrollView remains functional, allowing users to scroll through the content, while also enabling the tap gesture for the green area.

Conclusion

By restructuring your view hierarchy in SwiftUI, you can overcome the limitations of gesture recognition under layered views like ScrollView. Use a transparent overlay to maintain user interactivity with underlying views without compromising the usability of your scrollable content. This method enhances your application's responsiveness and improves the overall user experience.

Implementing these techniques ensures your SwiftUI designs are both intuitive and functional. Now, you can let users interact with different parts of your UI seamlessly!