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The most reliable way to animate a mobile app is to model the UI state first, then use native animation APIs for interface changes. Use Lottie for largely predetermined vector artwork, Rive for interactive state-machine graphics, and video only for cinematic or photorealistic content. Share the motion specification across platforms, but implement it with Android and iOS conventions rather than forcing identical rendering.
Start with states, not timelines
Animation should be a visible consequence of a semantic state change, not the source of truth. Define the states a component can occupy before choosing an effect.
| Component | Example states | Visual response |
|---|---|---|
| Upload | Idle, loading, success, failure, disabled | Progress indicator, success icon, or error treatment |
| Expandable card | Collapsed, expanding, expanded, collapsing | Height, chevron rotation, and content visibility |
| Favorite button | Unselected, pressed, selected | Color, icon, and a brief scale change |
Keep semantic and visual state separate. For example, uploadStatus = success is the truth; fading out progress and scaling in a checkmark merely communicates it. If an animation is interrupted, the UI must still settle on the correct status.
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Motion handoff template
Trigger: user taps Expand
Initial state: collapsed card, height 72
Final state: expanded height determined by content
Properties: height, chevron rotation, content opacity
Timing: spring or duration/easing
Interruptions: reverse smoothly if tapped again
Reduced motion: remove travel and use a short fade
Completion: content is interactive when visibleClassify the purpose before selecting an effect:
- Feedback: presses, toggles, validation, refresh, copy confirmation, likes, and bookmarks.
- Orientation: navigation, hierarchy changes, expansion, and shared-element movement.
- Status: loading, progress, empty states, recovery, synchronization, and transfers.
- Delight: onboarding, celebration, branding, and decorative loops.
Functional motion should clarify cause and effect. Decorative motion should never delay or obstruct the task.
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Choose native animation, Lottie, Rive, or video
| Requirement | Best default | Reason |
|---|---|---|
| Fade, scale, move, resize, reveal | Native APIs | State-aware, small, testable, and layout-friendly |
| Screen navigation | Native navigation transitions | Preserves platform behavior and accessibility |
| Simple animated icon | Native vector APIs | Easy to theme and usually lightweight |
| Authored illustration or celebration | Lottie | Efficient for predetermined vector motion |
| Interactive character or control | Rive | Runtime state machines and input handling |
| Photorealistic or cinematic sequence | Video or raster sequence | Handles complex imagery, at a larger cost |
Use this decision order: try a built-in transition, then a single-property animation, then a synchronized transition, then a layout animation. Only after that decide whether the motion is authored artwork or needs a runtime state machine. Native APIs are generally the right default for UI state; they are not automatically the best choice for complex artwork.
Create animations in Jetpack Compose
Compose provides AnimatedVisibility, AnimatedContent, animateContentSize, value-based animate*AsState APIs, Transition, and navigation transition hooks. See the Compose animation documentation for the current API set.
Show and hide content
@Composable
fun StatusMessage(isVisible: Boolean) {
AnimatedVisibility(
visible = isVisible,
enter = fadeIn() + expandVertically(),
exit = fadeOut() + shrinkVertically()
) {
Text("Saved")
}
}Use AnimatedVisibility for insertion and removal. Use AnimatedContent when one piece of content changes into another.
Animate one property
@Composable
fun FavoriteButton(isFavorite: Boolean) {
val scale by animateFloatAsState(
targetValue = if (isFavorite) 1.15f else 1f,
label = "favorite scale"
)
Icon(
imageVector = if (isFavorite) Icons.Default.Favorite
else Icons.Default.FavoriteBorder,
contentDescription = "Favorite",
modifier = Modifier.graphicsLayer {
scaleX = scale
scaleY = scale
}
)
}This pattern suits isolated opacity, scale, color, or offset changes. Use a transition when several properties must respond to the same state.
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Synchronize multiple properties
enum class CardState { Collapsed, Expanded }
@Composable
fun ExpandableCard(state: CardState) {
val transition = updateTransition(state, label = "card transition")
val rotation by transition.animateFloat(label = "chevron rotation") {
if (it == CardState.Expanded) 180f else 0f
}
val alpha by transition.animateFloat(label = "content alpha") {
if (it == CardState.Expanded) 1f else 0f
}
Column {
Icon(Icons.Default.ExpandMore, null, Modifier.rotate(rotation))
Text("Additional details", Modifier.alpha(alpha))
}
}Animate layout and navigation
Place animateContentSize() before the size-changing modifier:
Column(
modifier = Modifier
.animateContentSize()
.height(if (expanded) 400.dp else 120.dp)
) { Text("Description") }For navigation, configure the navigation library’s enterTransition and exitTransition rather than moving complete screens manually. Forward navigation, back navigation, deep links, and interrupted navigation should each have an intentional result. The Compose animation quick guide covers modifier ordering, navigation, and performance.
Read animated values in the least expensive phase that meets the need. Transform and opacity work in the draw phase can avoid unnecessary layout work; changing layout still requires measurement and placement. Profile instead of assuming a particular API is always faster.
Create animations in SwiftUI
SwiftUI is state-driven. withAnimation animates changes made in its closure, while .animation(_:value:) scopes animation to a specific value. Apple’s SwiftUI animation documentation describes these APIs and built-in transitions.
Animate a state change
struct FavoriteButton: View {
@State private var isFavorite = false
var body: some View {
Button {
withAnimation(.spring(duration: 0.35)) {
isFavorite.toggle()
}
} label: {
Image(systemName: isFavorite ? "heart.fill" : "heart")
.scaleEffect(isFavorite ? 1.15 : 1.0)
}
.accessibilityLabel(isFavorite ? "Remove favorite" : "Add favorite")
}
}Scope an animation to one value
struct LoadingRow: View {
let isLoading: Bool
var body: some View {
HStack {
Text("Syncing")
Spacer()
ProgressView().opacity(isLoading ? 1 : 0)
}
.animation(.easeInOut(duration: 0.2), value: isLoading)
}
}Insert and remove views
if isVisible {
Text("Saved")
.transition(.opacity.combined(with: .move(edge: .top)))
}The conditional view must be inside the animated state change for insertion and removal to occur. Layout changes can be animated with a value-scoped spring or ease curve. Navigation should use the platform’s navigation mechanisms, including appropriate behavior for back actions and deep links.
Support legacy Android Views and UIKit
Android Views
Existing View-based apps can use the android.animation package, ViewPropertyAnimator, AnimatorSet, layout transitions, and activity or scene transitions. Android documents property animation and related approaches in its Views animation overview.
view.animate()
.alpha(1f)
.translationY(0f)
.setDuration(220L)
.start()This is a practical path for a View codebase, not a reason to use View APIs in a new Compose screen.
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UIView.animate(
withDuration: 0.25,
delay: 0,
options: [.curveEaseInOut, .beginFromCurrentState]
) {
self.panel.alpha = 1
self.panel.transform = .identity
}Use UIViewPropertyAnimator for interruptible or scrubbable motion, UIView.animateKeyframes for staged sequences, Core Animation for layer effects, and custom view-controller transitions for navigation. For Auto Layout changes, update constraints and call layoutIfNeeded() inside the animation block.
SwiftUI and UIKit are interoperable but not interchangeable animation systems. Apple notes that SwiftUI animations do not have a backing CAAnimation and cannot be used directly with UIViewPropertyAnimator or UIKit keyframe animations. See Apple’s interoperability guidance.
Use Lottie for authored motion graphics
Lottie is a JSON-based format with Android and iOS libraries, useful for checkmarks, confetti, empty states, onboarding, and branded loading illustrations. It is a poor default for layout-aware transitions or arbitrary user-driven interaction.
After Effects previews are not proof of runtime compatibility. LottieFiles documents unsupported or differently interpreted features in its developer documentation. Test the exported asset in both target runtimes, on representative devices, and in the release build. Check for missing effects, embedded raster images, large files, and differences between Android and iOS. Package a static fallback so a missing or corrupt asset cannot block a basic task.
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Use Rive for interactive animations
Rive provides an editor, .riv exports, Android and iOS runtimes, state machines, transitions, listeners, and data binding. It fits interactive characters, gesture-controlled graphics, and reusable components with many visual states. The Android runtime is one of its platform implementations.
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Rive adds a tool and runtime dependency, so it is unnecessary for a fade or expand/collapse. Confirm runtime compatibility, licensing, asset ownership, versioning, and fallback behavior before adopting it.
Share a motion specification, not identical code
Document the component, trigger, purpose, properties, timing category, easing or spring behavior, interruption rule, input methods, reduced-motion variant, semantic announcement, and fallback. Define behavior such as “quick confirmation” or “springy expansion” rather than demanding one duration on every platform. Android and iOS may need different values to feel native.
Shared Lottie or Rive assets do not guarantee identical rendering, text layout, timing, accessibility, or dynamic-type behavior. Treat the asset as one part of a cross-platform contract and validate each implementation.
Make motion accessible and interruptible
Reduced motion is a product requirement. Respect the system setting and provide an app-level option when appropriate. In reduced-motion mode, remove parallax, large travel, zoom, and repeating decorative loops; use an immediate state change or a short opacity transition instead. Preserve meaning with text, color, iconography, and accessible state announcements. Never make motion the only indication that an action succeeded.
Controls should remain understandable and usable while animation runs. Follow Apple’s motion guidance on supporting understanding and interaction at Human Interface Guidelines: Motion.
Handle interruption and cancellation
- Rapid taps: let the final semantic state win; do not queue obsolete animations.
- Reversal: animate from the current presentation when possible.
- Navigation: define behavior for back presses, duplicate actions, deep links, rotation, and backgrounding.
- Network work: never treat animation completion as proof of server success.
- Screen readers: update focus and announcements independently of visual timing.
- Asset failure: show a static fallback and log unsupported features.
Test real performance
There is no universal “fastest” format. Cost depends on animated layers, vectors, masks, mattes, gradients, raster images, text, layout recalculation, device age, thermal state, simultaneous work, and whether the animation runs during scrolling.
- Prefer transforms and opacity when layout need not change.
- Avoid allocations in per-frame callbacks.
- Stop infinite loops when components leave the screen or app.
- Test cold start, low memory, scrolling, typing, rotation, network updates, dark mode, localization, and dynamic type.
- Profile an older supported device as well as a current flagship.
- Inspect dropped frames with Android and iOS profiling tools.
- Measure compressed asset size and decompression cost in the release build.
Compose’s quick guide explains why frame-by-frame changes and expensive layout-phase work can affect responsiveness. Record cancellation and completion behavior as well as visual smoothness.
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Production checklist
- States and semantic source of truth are documented.
- Purpose, properties, timing, easing, and interruption rules are specified.
- The smallest suitable native API was tried first.
- Every authored asset was tested on Android and iOS runtimes.
- Unsupported effects, version requirements, ownership, and fallbacks are documented.
- Reduced-motion behavior removes nonessential travel and loops.
- Screen-reader state and focus do not depend on animation completion.
- Rapid input, cancellation, back navigation, deep links, rotation, and backgrounding were tested.
- Performance was measured in release builds on representative older hardware.
- Localization, dynamic type, dark mode, offline use, and low-memory behavior were verified.
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