📦 deps(thirdparty): update snapshots

2026-07-01 16:02:41 +00:00
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+# SwiftUI Transitions
+
+Transitions for view insertion/removal, custom transitions, and the Animatable protocol.
+
+## Table of Contents
+- [Property Animations vs Transitions](#property-animations-vs-transitions)
+- [Basic Transitions](#basic-transitions)
+- [Asymmetric Transitions](#asymmetric-transitions)
+- [Custom Transitions](#custom-transitions)
+- [Identity and Transitions](#identity-and-transitions)
+- [The Animatable Protocol](#the-animatable-protocol)
+
+---
+
+## Property Animations vs Transitions
+
+**Property animations**: Interpolate values on views that exist before AND after state change.
+
+**Transitions**: Animate views being inserted or removed from the render tree.
+
+```swift
+// Property animation - same view, different properties
+Rectangle()
+    .frame(width: isExpanded ? 200 : 100, height: 50)
+    .animation(.spring, value: isExpanded)
+
+// Transition - view inserted/removed
+if showDetail {
+    DetailView()
+        .transition(.scale)
+}
+```
+
+---
+
+## Basic Transitions
+
+### Critical: Transitions Require Animation Context
+
+```swift
+// GOOD - animation outside conditional
+VStack {
+    Button("Toggle") { showDetail.toggle() }
+    if showDetail {
+        DetailView()
+            .transition(.slide)
+    }
+}
+.animation(.spring, value: showDetail)
+
+// GOOD - explicit animation
+Button("Toggle") {
+    withAnimation(.spring) {
+        showDetail.toggle()
+    }
+}
+if showDetail {
+    DetailView()
+        .transition(.scale.combined(with: .opacity))
+}
+
+// BAD - animation inside conditional (removed with view!)
+if showDetail {
+    DetailView()
+        .transition(.slide)
+        .animation(.spring, value: showDetail)  // Won't work on removal!
+}
+
+// BAD - no animation context
+Button("Toggle") {
+    showDetail.toggle()  // No animation
+}
+if showDetail {
+    DetailView()
+        .transition(.slide)  // Ignored - just appears/disappears
+}
+```
+
+### Built-in Transitions
+
+| Transition | Effect |
+|------------|--------|
+| `.opacity` | Fade in/out (default) |
+| `.scale` | Scale up/down |
+| `.slide` | Slide from leading edge |
+| `.move(edge:)` | Move from specific edge |
+| `.offset(x:y:)` | Move by offset amount |
+
+### Combining Transitions
+
+```swift
+// Parallel - both simultaneously
+.transition(.slide.combined(with: .opacity))
+
+// Chained
+.transition(.scale.combined(with: .opacity).combined(with: .offset(y: 20)))
+```
+
+---
+
+## Asymmetric Transitions
+
+Different animations for insertion vs removal.
+
+```swift
+// GOOD - different animations for insert/remove
+if showCard {
+    CardView()
+        .transition(
+            .asymmetric(
+                insertion: .scale.combined(with: .opacity),
+                removal: .move(edge: .bottom).combined(with: .opacity)
+            )
+        )
+}
+
+// BAD - same transition when different behaviors needed
+if showCard {
+    CardView()
+        .transition(.slide)  // Same both ways - may feel awkward
+}
+```
+
+---
+
+## Custom Transitions
+
+### Pre-iOS 17
+
+```swift
+struct BlurModifier: ViewModifier {
+    var radius: CGFloat
+    func body(content: Content) -> some View {
+        content.blur(radius: radius)
+    }
+}
+
+extension AnyTransition {
+    static func blur(radius: CGFloat) -> AnyTransition {
+        .modifier(
+            active: BlurModifier(radius: radius),
+            identity: BlurModifier(radius: 0)
+        )
+    }
+}
+
+// Usage
+.transition(.blur(radius: 10))
+```
+
+### iOS 17+ (Transition Protocol)
+
+```swift
+struct BlurTransition: Transition {
+    var radius: CGFloat
+
+    func body(content: Content, phase: TransitionPhase) -> some View {
+        content
+            .blur(radius: phase.isIdentity ? 0 : radius)
+            .opacity(phase.isIdentity ? 1 : 0)
+    }
+}
+
+// Usage
+.transition(BlurTransition(radius: 10))
+```
+
+### Good vs Bad Custom Transitions
+
+```swift
+// GOOD - reusable transition
+if showContent {
+    ContentView()
+        .transition(BlurTransition(radius: 10))
+}
+
+// BAD - inline logic (won't animate on removal!)
+if showContent {
+    ContentView()
+        .blur(radius: showContent ? 0 : 10)  // Not a transition
+        .opacity(showContent ? 1 : 0)
+}
+```
+
+---
+
+## Identity and Transitions
+
+View identity changes trigger transitions, not property animations.
+
+```swift
+// Triggers transition - different branches have different identities
+if isExpanded {
+    Rectangle().frame(width: 200, height: 50)
+} else {
+    Rectangle().frame(width: 100, height: 50)
+}
+
+// Triggers transition - .id() changes identity
+Rectangle()
+    .id(flag)  // Different identity when flag changes
+    .transition(.scale)
+
+// Property animation - same view, same identity
+Rectangle()
+    .frame(width: isExpanded ? 200 : 100, height: 50)
+    .animation(.spring, value: isExpanded)
+```
+
+---
+
+## The Animatable Protocol
+
+Enables custom property interpolation during animations.
+
+### Protocol Definition
+
+```swift
+protocol Animatable {
+    associatedtype AnimatableData: VectorArithmetic
+    var animatableData: AnimatableData { get set }
+}
+```
+
+### Basic Implementation
+
+```swift
+// GOOD - explicit animatableData
+struct ShakeModifier: ViewModifier, Animatable {
+    var shakeCount: Double
+
+    var animatableData: Double {
+        get { shakeCount }
+        set { shakeCount = newValue }
+    }
+
+    func body(content: Content) -> some View {
+        content.offset(x: sin(shakeCount * .pi * 2) * 10)
+    }
+}
+
+extension View {
+    func shake(count: Int) -> some View {
+        modifier(ShakeModifier(shakeCount: Double(count)))
+    }
+}
+
+// Usage
+Button("Shake") { shakeCount += 3 }
+    .shake(count: shakeCount)
+    .animation(.default, value: shakeCount)
+
+// BAD - missing animatableData (silent failure!)
+struct BadShakeModifier: ViewModifier {
+    var shakeCount: Double
+    // Missing animatableData! Uses EmptyAnimatableData
+
+    func body(content: Content) -> some View {
+        content.offset(x: sin(shakeCount * .pi * 2) * 10)
+    }
+}
+// Animation jumps to final value instead of interpolating
+```
+
+### Multiple Properties with AnimatablePair
+
+```swift
+// GOOD - AnimatablePair for two properties
+struct ComplexModifier: ViewModifier, Animatable {
+    var scale: CGFloat
+    var rotation: Double
+
+    var animatableData: AnimatablePair<CGFloat, Double> {
+        get { AnimatablePair(scale, rotation) }
+        set {
+            scale = newValue.first
+            rotation = newValue.second
+        }
+    }
+
+    func body(content: Content) -> some View {
+        content
+            .scaleEffect(scale)
+            .rotationEffect(.degrees(rotation))
+    }
+}
+
+// GOOD - nested AnimatablePair for 3+ properties
+struct ThreePropertyModifier: ViewModifier, Animatable {
+    var x: CGFloat
+    var y: CGFloat
+    var rotation: Double
+
+    var animatableData: AnimatablePair<AnimatablePair<CGFloat, CGFloat>, Double> {
+        get { AnimatablePair(AnimatablePair(x, y), rotation) }
+        set {
+            x = newValue.first.first
+            y = newValue.first.second
+            rotation = newValue.second
+        }
+    }
+
+    func body(content: Content) -> some View {
+        content
+            .offset(x: x, y: y)
+            .rotationEffect(.degrees(rotation))
+    }
+}
+```
+
+---
+
+## Quick Reference
+
+### Do
+- Place transitions outside conditional structures
+- Use `withAnimation` or `.animation` outside the `if`
+- Implement `animatableData` explicitly for custom Animatable
+- Use `AnimatablePair` for multiple animated properties
+- Use asymmetric transitions when insert/remove need different effects
+
+### Don't
+- Put animation modifiers inside conditionals for transitions
+- Forget `animatableData` implementation (silent failure)
+- Use inline blur/opacity instead of proper transitions
+- Expect property animation when view identity changes