Скачать или смотреть How to Use NavigationLink with a Button in SwiftUI

Learn how to effectively use `NavigationLink` in SwiftUI for seamless navigation based on button actions with conditions.
---
This video is based on the question https://stackoverflow.com/q/68118435/ asked by the user 'SoftGuru' ( https://stackoverflow.com/u/14135794/ ) and on the answer https://stackoverflow.com/a/68118678/ provided by the user 'ryandu' ( https://stackoverflow.com/u/13770657/ ) 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: Button with NavigationLink and function call SwiftUI

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.
---
Enhancing Navigation in SwiftUI with Conditional Button Actions

Creating a smooth and intuitive user experience in apps often requires dynamic navigation methodologies. In SwiftUI, you may encounter situations where you want a button to not only trigger an action but also navigate to different views based on certain conditions. In this guide, we'll address a common issue faced by developers: how to implement a NavigationLink that activates based on the result of a function call when a button is clicked.

The Challenge

Imagine you have a button in your SwiftUI application that, when pressed, needs to trigger a function. Depending on the function's return value, you might want to navigate to a new view (like a SheetView). The objective is to ensure the NavigationLink activates automatically based on your button click, rather than requiring a second interaction.

Here's a typical scenario: your button's action calls a function (let's say test(value: Int)) that returns a boolean. If the return value is true, you want to navigate to SheetView. If this is set up incorrectly, the app won't behave as expected. Let’s dive into how you can achieve this.

Solution: Using isActive Binding with NavigationLink

To resolve this issue, we can leverage the isActive parameter within the NavigationLink. Below is an improved version of a SwiftUI example that demonstrates how to do this.

Updated Code Implementation

Here's a step-by-step breakdown of the updated SwiftUI code that correctly handles the navigation based on the button's action:

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

Explanation of the Code

State Variables: The @ State properties check and answer manage the state of your view. The answer property is crucial for controlling navigation.

NavigationLink Setup: The NavigationLink is now configured with isActive: $answer. This stops it from only activating with user interaction and instead links directly to the result of your button action.

Button Action: When the button is pressed, it calls the test(value: Int) function. If this returns true, the answer variable changes, which in turn activates the NavigationLink to push the SheetView onto the navigation stack.

Conclusion

Navigating dynamically in SwiftUI based on conditions can drastically improve user experience in your applications. By using the isActive binding property of NavigationLink, you can effectively control the navigation flow in response to button taps and function evaluations. Implementing these practices allows for a more fluid transition between views, enhancing app usability.

Happy coding, and may your navigation be seamless!