SwiftUI

Build and review SwiftUI as one integrated discipline: platform design, view architecture, data flow, concurrency, navigation, accessibility, performance, and testing. Prefer the newest APIs supported by the project's actual SDK and deployment target. macOS 26/iOS 26 Liquid Glass is a focused path for projects that target those SDKs; it is not a reason to raise a project's deployment target or to assume an API is available. Verify availability and signatures in the installed SDK or Apple's documentation before making an unstable API claim. Do not recreate Liquid Glass with blur, opacity, gradients, or custom overlays.

Standard SwiftUI components, navigation, toolbars, tab bars, menus, sheets, and controls already adopt the current system appearance. Start by using those components as intended; add custom glass only when a custom functional control needs it.

Read the focused reference before acting: