Intro to Material Motion

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An introduction to Material Motion by @featherless - engineering lead // April 10, 2017

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About @featherless Software designer on the Material Design team I build shared libraries for Google’s iOS apps and the open source community

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About @featherless Software designer on the Material Design team Previously: Facebook iOS app 2009 Nimbus iOS libraries 2011 Google Maps iOS app 2012 Material Components iOS libraries at Google 2013, 2014-2015

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productive inspiring

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Material Motion

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engineering For considerations on motion design, visit our spec at material.io/guidelines/motion/

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hard

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hard

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hard

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hard

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hard

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hard get right

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Challenges

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Challenges

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Jank is any stuttering, juddering or just plain halting that users see when an app isn't keeping up with the refresh rate. - jankfree.org

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Challenges

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Gestural interactions should feed their velocity into animations in a simulation of continuous momentum.

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Gestural interactions should feed their velocity into animations in a simulation of continuous momentum. - from Facebook Paper’s tech talk youtu.be/OiY1cheLpmI?t=47m30s

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Challenges

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Don’t force users to wait for animations to complete before being allowed to take their next action.

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Challenges

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Animations don’t generally react well to breakpoints because breakpoints disconnect animations from time.

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Animations don’t generally react well to breakpoints because breakpoints disconnect animations from time. We need real-time tooling designed specifically for motion.

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Challenges

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Intro to Material Motion

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Intro to Material Motion How to make things move

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Intro to Material Motion How to make things move How to build transitions

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Intro to Material Motion How to make things move How to build transitions Closing thoughts

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Common implementations of motion

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one-off animation code scattered in view controllers Common implementations of motion

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Interactions Constraints Intro to Material Motion How to make things move How to build transitions Closing thoughts

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Interactions Constraints Intro to Material Motion How to make things move How to build transitions Closing thoughts

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How to make things move

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How to make things move An object that conforms to the Interaction protocol.

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How to make things move

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Gestural interactions How to make things move

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How to make things move Gestural interactions Animated interactions

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How to make things move Gestural interactions Animated interactions Compositional interactions

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How to make things move Gestural

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let draggable = Draggable() let rotatable = Rotatable() let scalable = Scalable() How to make things move Gestural

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// Interaction: Draggable let view = UIView() How to make things move

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// Interaction: Draggable let view = UIView() let runtime = MotionRuntime() How to make things move

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// Interaction: Draggable let view = UIView() let runtime = MotionRuntime() let draggable = Draggable() How to make things move

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// Interaction: Draggable let view = UIView() let runtime = MotionRuntime() let draggable = Draggable() runtime.add(draggable, to: view) How to make things move

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// Interaction: Draggable let view = UIView() let runtime = MotionRuntime() runtime.add(Rotatable(), to: view) How to make things move

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// Interaction: Draggable let view = UIView() let runtime = MotionRuntime() runtime.add(Scalable(), to: view) How to make things move

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How to make things move

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Use Core Animation. How to make things move

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How to make things move Use Core Animation. Generic Interaction types.

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Use Core Animation. Generic Interaction types. let spring = Spring() How to make things move

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Use Core Animation. Generic Interaction types. let spring = Spring() let spring = Spring() How to make things move

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How to make things move Use Core Animation. Generic Interaction types. let spring = Spring() let spring = Spring() let tween = Tween() let tween = Tween()

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// Interaction: Spring let view = UIView() let runtime = MotionRuntime() How to make things move

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// Interaction: Spring let view = UIView() let runtime = MotionRuntime() let spring = Spring() How to make things move

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// Interaction: Spring let view = UIView() let runtime = MotionRuntime() let spring = Spring() runtime.add(spring, How to make things move

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// Interaction: Spring let view = UIView() let runtime = MotionRuntime() let spring = Spring() runtime.add(spring, to: runtime.get(view).position) How to make things move

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// Interaction: Spring let view = UIView() let runtime = MotionRuntime() let spring = Spring() runtime.add(spring, to: runtime.get(view).position) How to make things move

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Reactive programming

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reactive Reactive programming

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Reactive programming view: UIView view

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Reactive programming view: UIView position: ReactiveProperty position 50, 50 view

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Reactive programming view: UIView position: ReactiveProperty let subscription = position .subscribe { value in print(value) } position 50, 50 view Subscription

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Reactive programming view: UIView position: ReactiveProperty let subscription = position .subscribe { value in print(value) } Subscription Console 50, 50 position 50, 50 view

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Reactive programming view: UIView position: ReactiveProperty let subscription = position .subscribe { value in print(value) } position.value = .init(x: 10, y: 20) Subscription Console 50, 50 10, 20 position 50, 50 view

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// Interaction: Spring let view = UIView() let runtime = MotionRuntime() let spring = Spring() runtime.add(spring, to: runtime.get(view).position) How to make things move

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// Interaction: Spring let view = UIView() let runtime = MotionRuntime() let spring = Spring() runtime.add(spring, to: runtime.get(view).position) spring.destination How to make things move reactive property

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// Interaction: Spring let view = UIView() let runtime = MotionRuntime() let spring = Spring() runtime.add(spring, to: runtime.get(view).position) spring.destination.value = CGPoint(x: 75, y: 50) How to make things move

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Reactive programming connect

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Reactive programming runtime.add(spring, to: property) Spring() property

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Reactive programming Spring system value runtime.add(spring, to: property) property

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Reactive programming view runtime.add(Draggable(), to: view) Draggable()

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Reactive programming Pan Gesture translation position view runtime.add(Draggable(), to: view)

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Reactive programming composable

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Reactive programming Draggable + Rotatable + Scalable =

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Reactive programming Draggable + Rotatable + Scalable = DirectlyManipulable

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Reactive programming Draggable + Rotatable + Scalable = DirectlyManipulable Draggable + Spring =

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Reactive programming Draggable + Rotatable + Scalable = DirectlyManipulable Draggable + Spring = Tossable

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// Interaction: Tossable let view = UIView() let runtime = MotionRuntime() How to make things move

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// Interaction: Tossable let view = UIView() let runtime = MotionRuntime() let tossable = Tossable() How to make things move

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// Interaction: Tossable let view = UIView() let runtime = MotionRuntime() let tossable = Tossable() runtime.add(tossable, to: view) How to make things move

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// Interaction: Tossable let view = UIView() let runtime = MotionRuntime() let tossable = Tossable() runtime.add(tossable, to: view) // Under the hood: How to make things move

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// Interaction: Tossable let view = UIView() let runtime = MotionRuntime() let tossable = Tossable() runtime.add(tossable, to: view) // Under the hood: // runtime.add(spring, to: view.position) // runtime.add(draggable, to: view) How to make things move

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// Interaction: Tossable let view = UIView() let runtime = MotionRuntime() let tossable = Tossable() runtime.add(tossable, to: view) // Under the hood: // runtime.connect(draggable.finalVelocity, to: spring.initialVelocity) // runtime.add(spring, to: view.position) // runtime.add(draggable, to: view) How to make things move

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Interactions Constraints Intro to Material Motion How to make things move How to build transitions Closing thoughts

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Reactive programming Pan Gesture translation position view

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Reactive programming Pan Gesture translation position view constraint xLocked

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// Customizing interactions let draggable = Draggable() runtime.add(draggable, to: mochiView) How to make things move

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// Customizing interactions - Constraints let draggable = Draggable() runtime.add(draggable, to: mochiView, constraints: { return $0.xLocked(to: 100) }) How to make things move

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// Customizing interactions - Constraints let draggable = Draggable() runtime.add(draggable, to: mochiView, constraints: { return $0.xLocked(to: 100) .rubberBanded(below: -50, above: 50, maxLength: 25) }) How to make things move

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Intro to Material Motion How to make things move How to build transitions Closing thoughts Short summary:

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Intro to Material Motion How to make things move How to build transitions Closing thoughts Short summary: ●

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Intro to Material Motion How to make things move How to build transitions Closing thoughts Short summary: ● ●

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Intro to Material Motion How to make things move How to build transitions Closing thoughts Short summary: ● ● ●

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Intro to Material Motion How to make things move How to build transitions Closing thoughts

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Intro to Material Motion How to make things move How to build transitions Closing thoughts Using custom transitions Creating a transition

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Intro to Material Motion How to make things move How to build transitions Closing thoughts Using custom transitions Creating a transition

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// Custom transitions viewController How to build transitions

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// Custom transitions viewController.transitionController transitionController How to build transitions

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// Custom transitions viewController.transitionController.transition = PushBackTransition.self How to build transitions PushBackTransition

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// Custom transitions viewController.transitionController.transition = PushBackTransition.self present(viewController, animated: true) How to build transitions

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// Custom transitions viewController.transitionController.transition = PushBackTransition.self present(viewController, animated: true) dismiss(animated: true) How to build transitions

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Intro to Material Motion How to make things move How to build transitions Closing thoughts Using custom transitions Creating a transition

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// Building a transition class PushBackTransition: Transition { } How to build transitions

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How to build transitions // Building a transition class PushBackTransition: Transition { func willBegin(ctx: TransitionContext, runtime: MotionRuntime) { } }

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How to build transitions // Building a transition class PushBackTransition: Transition { func willBegin(ctx: TransitionContext, runtime: MotionRuntime) { } }

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How to build transitions // Building a transition class PushBackTransition: Transition { func willBegin(ctx: TransitionContext, runtime: MotionRuntime) { } } ● ● ● ●

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How to build transitions // Building a transition class PushBackTransition: Transition { func willBegin(ctx: TransitionContext, runtime: MotionRuntime) { let offscreen = ctx.height + ctx.fore.height / 2 let onscreen = ctx.center.y runtime.add(TransitionSpring(back: offscreen, fore: onscreen, direction: ctx.direction) to: ctx.fore.positionY) } }

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// Building a transition class PushBackTransition: Transition { func willBegin(ctx: TransitionContext, runtime: MotionRuntime) { let offscreen = ctx.height + ctx.fore.height / 2 let onscreen = ctx.center.y runtime.add(TransitionSpring(back: offscreen, fore: onscreen, direction: ctx.direction) to: ctx.fore.positionY) runtime.add(TransitionSpring(back: 1, fore: 0.95, direction: ctx.direction), to: ctx.back.scale) } } How to build transitions

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Reactive programming

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Reactive programming reversible

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Reactive programming reversible

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Reactive programming position view

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Reactive programming value position view Spring

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Reactive programming value position view Spring destination

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Reactive programming value position view Spring destination fore value

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Reactive programming value position view Spring destination back value

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Reactive programming value position view Spring destination direction

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Reactive programming value position view Spring destination direction rewrite back fore

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Reactive programming value position view Spring destination direction rewrite fore

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Reactive programming value position view Spring destination direction rewrite back

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Summary: Intro to Material Motion How to make things move How to build transitions Closing thoughts

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Summary: ● Intro to Material Motion How to make things move How to build transitions Closing thoughts

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Intro to Material Motion How to make things move How to build transitions Closing thoughts Summary: ● ● reactive

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Intro to Material Motion How to make things move How to build transitions Closing thoughts

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responsive Intro to Material Motion How to make things move How to build transitions Closing thoughts

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responsive ● ● ● ● ● Intro to Material Motion How to make things move How to build transitions Closing thoughts

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responsive ● ● ● ● ● github.com/material-motion Intro to Material Motion How to make things move How to build transitions Closing thoughts

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responsive ● ● ● ● ● github.com/material-motion discord.gg/ZJyGXza Intro to Material Motion How to make things move How to build transitions Closing thoughts

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github.com/material-motion discord.gg/ZJyGXza

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Some quick background on Core Animation (CA) Core Animation

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Some quick background on Core Animation (CA) ● CA animations occur on the render server. Core Animation

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Some quick background on Core Animation (CA) ● CA animations occur on the render server. ● The render server is independent from your app’s main thread. Core Animation

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Some quick background on Core Animation (CA) ● CA animations occur on the render server. ● The render server is independent from your app’s main thread. This means CA animations aren’t subject to main-thread jank. Core Animation

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Core Animation Some quick background on Core Animation (CA) ● CA animations occur on the render server. ● The render server is independent from your app’s main thread. This means CA animations aren’t subject to main-thread jank. Third-party animation libraries like Facebook’s POP operate on the main thread, which is why POP is often used hand-in-hand with AsyncDisplayKit.