swiftui-animation

To choose a SwiftUI animation API, match the API to the motion type: use withAnimation for state-driven changes, PhaseAnimator for multi-phase motion, KeyframeAnimator for choreography, and matchedGeometryEffect for shared-element transitions.

Fix inconsistent SwiftUI animation behavior by avoiding over-scoped implicit animations and expensive work inside animation closures. Apply correct API selection alongside proper spring and curve configuration to ensure smooth, intentional motion.

matchedGeometryEffect works for shared-element hero transitions by linking two views with the same matched geometry namespace, allowing SwiftUI to animate the position and size changes smoothly during navigation or state updates.

Make SwiftUI animations respect Reduce Motion by checking the accessibilityReduceMotion environment value and replacing or disabling spring and keyframe animations with instant transitions or static state changes when the setting is active.

You can use PhaseAnimator for multi-phase SwiftUI animations that cycle through states automatically, and KeyframeAnimator for fine-grained, timeline-based keyframe choreography to produce polished, complex motion sequences.

SwiftUI view insertion and removal transitions look broken when using incorrect transition composition or duplicated matched-geometry sources. Apply withAnimation correctly to state changes and ensure transition modifiers are properly scoped.