swiftui-animation

SwiftUI animations use explicit and implicit modifiers with spring parameters to create physics-based motion. Apply `.animation(.spring(...))` to views or use `.withAnimation` for state changes. Spring presets and custom damping/stiffness values control bounce and speed, letting you animate position, scale, opacity, and other properties with natural deceleration curves.

Hero animations in SwiftUI use `matchedGeometryEffect` to smoothly transition a view between screens. Tag source and destination views with the same ID and namespace, then coordinate transitions with `NavigationStack` or sheet presentation. The effect tracks geometry changes and animates scale, position, and shape simultaneously across view hierarchies.

Yes. Metal shader integration in SwiftUI enables GPU-based effects for advanced visual transformations. Combine Metal shaders with animation timelines to offload complex calculations from the CPU, reducing overhead on graphics-heavy animations and enabling real-time effects like distortions, color shifts, and particle systems.

PhaseAnimator and KeyframeAnimator coordinate sequences of animation stages with precise timing control. PhaseAnimator cycles through discrete phases, while KeyframeAnimator defines keyframes with specific timing curves. Both allow staggered animations, conditional triggers, and complex motion patterns across multiple properties or views.

Transitions handle view insertion and removal animations, while explicit animations control property changes over time. Use transitions for NavigationStack, sheets, and conditional rendering; use explicit animations for opacity, scale, and position changes within persistent views. Transitions automatically manage timing; explicit animations require manual state management.

Respect `accessibilityReduceMotionEnabled` to disable or simplify animations for users sensitive to motion. Test animation speed and duration to ensure they don't cause disorientation. Provide semantic information independent of animation; never rely solely on motion to convey UI state or user feedback.