Скачать или смотреть How to Trigger Action When Releasing LongPressGesture in SwiftUI

Learn how to effectively trigger actions in SwiftUI when releasing a LongPressGesture. This guide breaks down the solution step by step using easy-to-understand concepts and code examples.
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This video is based on the question https://stackoverflow.com/q/63204328/ asked by the user 'xmetal' ( https://stackoverflow.com/u/13419268/ ) and on the answer https://stackoverflow.com/a/63204517/ provided by the user 'pawello2222' ( https://stackoverflow.com/u/8697793/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding LongPressGesture in SwiftUI

If you're working with SwiftUI and trying to implement a LongPressGesture, you might run into a common issue: triggering an action when the long press gesture is released, rather than when it is first activated. In particular, you want the app to respond only when the user releases their finger after a long press. This can be tricky, but fear not—this guide will help you resolve it step-by-step!

The Problem

Imagine you have a button or an image that you want to respond to a long press. You want to ensure that a specific action occurs when the long press is recognized and subsequently released. However, many developers notice that their action is triggered immediately upon starting the long press, which is likely not the intended behavior. Let's look at a code snippet that captures this issue:

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

In this example, when the image is long-pressed, the message "pressed" is printed immediately instead of waiting for the release of the gesture.

The Solution

To correctly trigger an action upon releasing the long press, we can restructure the code to use a Button instead of relying on gestures alone. Here's a clean and efficient way to handle long press and release actions in SwiftUI:

Step-by-Step Code Implementation

Define the Button: We can encapsulate the desired behavior using a button, which already has a press event and can be easily styled to match our needs.

Create a Custom ButtonStyle: The button style allows us to scale it down when pressed, creating a tactile feedback experience.

Here’s how we can write this code:

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

Explanation of the Code

Button Action: The Button now takes an action that is executed when the button is released, cleverly solving our problem.

Scalable Button Style: This custom ButtonStyle scales the button down visually when pressed. configuration.isPressed checks if the button is in the pressed state and applies the scaling effect accordingly.

Conclusion

By using a Button, we can easily trigger actions on release without struggling with gesture states. This approach not only simplifies your code but also provides a pleasant experience for users who expect tactile feedback from buttons.

Now with these adjustments, your app should correctly print "Pressed" only upon releasing the long-press gesture, creating a more intuitive user experience. Happy coding!