How to Change Shape Color Inside a Custom ButtonStyle in SwiftUI

Learn how to change the color of custom shapes in your SwiftUI button styles dynamically as they are pressed. This guide will walk you through creating engaging button styles.
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Changing Shape Color Inside a Custom ButtonStyle in SwiftUI

In the world of SwiftUI, creating custom button styles is an excellent way to enhance the user interface of your application. However, a common challenge developers face is dynamically changing the color of a custom shape used as a button’s label when it is pressed. In this post, we’ll explore how to create a custom ButtonStyle that allows us to achieve this effect.

Understanding the Problem

When you create a button in SwiftUI, you often want to provide visual feedback to the user. This feedback often includes changing the color of the button when it is pressed. While it's straightforward to change the color using standard buttons with text labels, it's not as simple when working with custom shapes. Here's a breakdown of the problem:

You can change the color of a text label using the foregroundColor modifier, depending on whether the button is pressed or not.

However, customizing the color of a Shape such as a custom button's label requires more work, as configuration.label does not provide direct access to shape-specific view modifiers.

The Solution

The key is to apply the foregroundColor modifier inside your makeBody function and utilize that color when filling in your custom shape. Below, we will go through the steps to implement this solution.

Step 1: Declare Your Custom Button Style

The first step is to create a custom button style that will handle the appearance of our button, including the dynamic color change.

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

In this code, the button color changes based on whether it is pressed. We check configuration.isPressed to determine which color to use.

Step 2: Create the Button with Your Custom Shape

Next, create a button that utilizes your custom shape (RingSegment()), and apply the custom button style you created.

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

By calling .fill(.foreground), you ensure that your custom shape takes the color specified in the button's foregroundColor modifier, allowing it to change dynamically based on the button's state.

Conclusion

Changing the color of custom shapes in SwiftUI buttons is achievable by creatively using the foregroundColor modifier within your button style's makeBody function. This approach lets you deliver better visual feedback to users with a dynamic color change for your custom shapes. Now you can enhance the interactivity of your applications with beautiful and engaging custom buttons.

Feel free to build on this technique by experimenting with different shapes and colors to find the perfect fit for your application’s styling needs.

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