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Liquid Glass is a new material introduced by Apple that enhances the design and functionality of navigation bars and other UI elements. It is designed to be adaptive, translucent, and dynamic, providing a fluid and immersive user experience. Liquid Glass intelligently adapts its appearance based on the content and context behind it, ensuring legibility and contrast. It can switch between light and dark modes and is used to create a distinct functional layer for controls and navigation.

For navigation bars, Liquid Glass helps elevate navigational controls by creating a natural separation from the content, enhancing clarity without breaking the flow. It adapts to the environment, ensuring that elements like nav bars and tab bars remain legible by flipping from light to dark based on the background. This material is used across various UI components, including toolbars, sidebars, and tab bars, to maintain a cohesive design language across Apple's platforms.

If you are interested in learning more about how Liquid Glass is implemented in UIKit apps, you can refer to the session Build a UIKit app with the new design (08:54) where navigation and toolbars are discussed. Additionally, the session Meet Liquid Glass (15:03) provides an in-depth look at the principles and adaptivity of Liquid Glass.