# UI & Design

Build beautiful, performant interfaces with expert guidance on the latest Apple design systems and testing practices.

## Skills

- **[Liquid Glass](/skills/ui-design/liquid-glass)** – Apple's new material design system (iOS 26+) with expert review checklist
  - *"I'm implementing Liquid Glass but the lensing effect looks like regular blur. What am I missing?"*
  - *"How do I ensure text contrast and legibility while using Liquid Glass?"*

- **[SwiftUI Performance](/skills/ui-design/swiftui-performance)** – Master the new SwiftUI Instrument in Instruments 26, identify bottlenecks with Cause & Effect Graph
  - *"My animations stutter and scrolling is janky. How do I know if SwiftUI is the bottleneck?"*
  - *"Views are updating way too often even though their data hasn't changed."*

- **[SwiftUI Debugging](/skills/ui-design/swiftui-debugging)** – View updates, preview crashes, layout issues with diagnostic decision trees and 3 real-world examples
  - *"List item doesn't update even though the data changed."*
  - *"Preview keeps crashing with mysterious dependency errors."*

- **[UI Testing](/skills/ui-design/ui-testing)** – Recording UI Automation (Xcode 26) and condition-based waiting for reliable tests
  - *"Tests pass locally but fail in CI with no obvious reason."*
  - *"How do I replace sleep() timeouts with reliable condition-based waiting?"*
