89 lines
3.9 KiB
Markdown
89 lines
3.9 KiB
Markdown
---
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name: mobile-touch
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description: Use when designing iOS/Android gestures, haptic feedback, touch interactions, or native mobile animations.
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---
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# Mobile Touch Animation
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Apply Disney's 12 animation principles to mobile gestures, haptics, and native app motion.
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## Quick Reference
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| Principle | Mobile Implementation |
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|-----------|----------------------|
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| Squash & Stretch | Rubber-banding, bounce on scroll limits |
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| Anticipation | Peek before reveal, long-press preview |
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| Staging | Sheet presentations, focus states |
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| Straight Ahead / Pose to Pose | Gesture-driven vs preset transitions |
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| Follow Through / Overlapping | Momentum scrolling, trailing elements |
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| Slow In / Slow Out | iOS spring animations, Material easing |
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| Arc | Swipe-to-dismiss curves, card throws |
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| Secondary Action | Haptic pulse with visual feedback |
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| Timing | Touch response <100ms, transitions 250-350ms |
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| Exaggeration | Bounce amplitude, haptic intensity |
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| Solid Drawing | Respect safe areas, consistent anchors |
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| Appeal | 60fps minimum, gesture continuity |
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## Principle Applications
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**Squash & Stretch**: Implement rubber-band effect at scroll boundaries. Pull-to-refresh should stretch content naturally. Buttons compress on touch.
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**Anticipation**: Long-press shows preview before full action. Drag threshold provides visual hint before item lifts. Swipe shows edge of destination content.
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**Staging**: Use sheet presentations to maintain context. Dim and scale background during modal focus. Hero transitions connect views meaningfully.
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**Straight Ahead vs Pose to Pose**: Gesture-following animations (drag, pinch) are straight ahead—driven by touch input. System transitions (push, present) are pose to pose—predefined keyframes.
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**Follow Through & Overlapping**: Content continues moving after finger lifts (momentum). Navigation bar elements animate slightly after main content. Lists items settle with stagger.
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**Slow In / Slow Out**: iOS uses spring physics—configure mass, stiffness, damping. Android Material uses standard easing: `FastOutSlowIn`. Never use linear for user-initiated motion.
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**Arc**: Thrown cards follow parabolic arcs. Swipe-to-dismiss curves based on velocity vector. FAB expand/collapse follows natural arc path.
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**Secondary Action**: Pair haptic feedback with visual response. Button ripple accompanies press. Success checkmark triggers light haptic.
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**Timing**: Touch acknowledgment: <100ms. Quick actions: 150-250ms. View transitions: 250-350ms. Complex animations: 350-500ms. Haptic should sync precisely with visual.
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**Exaggeration**: Pull-to-refresh stretches beyond natural—makes feedback clear. Error shake is pronounced. Success animations celebrate appropriately.
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**Solid Drawing**: Respect device safe areas during animation. Maintain consistent transform origins. Account for notch/dynamic island in motion paths.
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**Appeal**: Minimum 60fps, target 120fps on ProMotion displays. Gesture-driven animation must feel connected to finger. Interruptible animations essential.
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## Platform Patterns
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### iOS
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```swift
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// Spring animation with follow-through
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UIView.animate(withDuration: 0.5,
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delay: 0,
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usingSpringWithDamping: 0.7,
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initialSpringVelocity: 0.5,
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options: .curveEaseOut)
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// Haptic pairing
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let feedback = UIImpactFeedbackGenerator(style: .medium)
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feedback.impactOccurred()
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```
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### Android
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```kotlin
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// Material spring animation
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SpringAnimation(view, DynamicAnimation.TRANSLATION_Y)
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.setSpring(SpringForce()
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.setStiffness(SpringForce.STIFFNESS_MEDIUM)
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.setDampingRatio(SpringForce.DAMPING_RATIO_MEDIUM_BOUNCY))
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.start()
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```
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## Haptic Guidelines
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| Action | iOS | Android |
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|--------|-----|---------|
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| Selection | `.selection` | `EFFECT_TICK` |
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| Success | `.success` | `EFFECT_CLICK` |
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| Warning | `.warning` | `EFFECT_DOUBLE_CLICK` |
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| Error | `.error` | `EFFECT_HEAVY_CLICK` |
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Haptics are secondary action—always pair with visual confirmation.
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