Dynamic Color Blending in SwiftUI

Creating Visual Feedback with Light-to-Pure Color Transitions

In modern UI design, visual cues can enhance user experience by providing immediate feedback. One powerful technique is dynamic color blending — adjusting a color’s intensity based on numeric values. For example, imagine a progress indicator that starts with a soft, pastel blue at 0% and transitions to a deep, pure blue at 100%. This article walks you through creating such a color transition in SwiftUI.

The Concept

Dynamic color blending uses the idea of interpolating between two colors based on a normalized value. When the value is low, you show a lighter (less saturated) version of the color. As the value increases, the color gradually shifts toward its pure, fully saturated version.

In our example, we’ll focus on a single color — blue. We’ll define:

• Light Blue (Pastel Blue): Used when the value is low.
• Pure Blue: Used when the value is at its maximum (e.g., 100).

The core idea is to calculate a normalized fraction from your input value, then blend the RGB components of the light and pure colors accordingly.

The Code Example

Below is a complete SwiftUI example that demonstrates this concept. The…