swiftui-animation

SwiftUI Animation Expert

Expert guidance for implementing advanced SwiftUI animations and Metal shader integration. Covers animation curves, springs, transitions, matched geometry effects, PhaseAnimator, KeyframeAnimator, and GPU-accelerated shader effects.

When to Use This Skill

• Understanding motion design principles and when to use animation
• Making animations accessible and platform-appropriate
• Implementing animations in SwiftUI (springs, easing, keyframes)
• Creating view transitions (fade, slide, scale, custom)
• Building hero animations with matchedGeometryEffect
• Adding GPU-accelerated effects with Metal shaders
• Optimizing animation performance
• Creating multi-phase orchestrated animations

Quick Reference

Animation Basics

// Explicit animation (preferred)
withAnimation(.spring(response: 0.4, dampingFraction: 0.75)) {
    isExpanded.toggle()
}

// iOS 17+ spring presets
withAnimation(.snappy) { ... }  // Fast, small bounce
withAnimation(.smooth) { ... }  // Gentle, no bounce
withAnimation(.bouncy) { ... }  // More bounce

Common Transitions

// Basic
.transition(.opacity)
.transition(.scale)
.transition(.slide)
.transition(.move(edge: .bottom))

// Combined
.transition(.move(edge: .trailing).combined(with: .opacity))

// Asymmetric
.transition(.asymmetric(
    insertion: .move(edge: .bottom),
    removal: .opacity
))

Matched Geometry Effect

@Namespace var namespace

// Source view
ThumbnailView()
    .matchedGeometryEffect(id: "hero", in: namespace)

// Destination view
DetailView()
    .matchedGeometryEffect(id: "hero", in: namespace)

Metal Shader Effects (iOS 17+)

// Color manipulation
.colorEffect(ShaderLibrary.invert())

// Pixel displacement
.distortionEffect(
    ShaderLibrary.wave(.float(time)),
    maxSampleOffset: CGSize(width: 20, height: 20)
)

// Full layer access
.layerEffect(ShaderLibrary.blur(.float(radius)), maxSampleOffset: .zero)

Reference Materials