swiftui-animation

Review, write, and fix SwiftUI animations. Apply modern animation APIs with correct timing, transitions, and accessibility handling using Swift 6.2 patterns.

| State-driven | withAnimation, .animation(:value:) | Simple property changes | | Multi-phase | PhaseAnimator | Sequenced multi-step animations | | Keyframe | KeyframeAnimator | Complex multi-property choreography | | Shared element | matchedGeometryEffect | Layout-driven hero transitions |

| Navigation | matchedTransitionSource + .navigationTransition(.zoom) | NavigationStack push/pop zoom | | View lifecycle | .transition() | Insertion and removal | | Text content | .contentTransition() | In-place text/number changes | | Symbol | .symbolEffect() | SF Symbol animations | | Custom | CustomAnimation protocol | Novel timing curves |

实施、审查或改进 SwiftUI 动画和过渡。在使用 withAnimation 添加隐式或显式动画、配置弹簧动画（.smooth、.snappy、.bouncy）、使用 PhaseAnimator/KeyframeAnimator 构建阶段或关键帧动画、使用matchedGeometryEffect 或matchedTransitionSource 创建英雄过渡、添加 SF 符号效果（bounce、pulse、variableColor、breath、rotate、wiggle）、实现自定义 Transition 或 CustomAnimation 类型或确保动画遵循accessibilityReduceMotion 时使用。 来源：dpearson2699/swift-ios-skills。