Animate with springs

18:00 - Spring Preset

withAnimation(.snappy) {
  // Changes
}

18:15 - Spring Preset with Custom Duration

withAnimation(.snappy(duration: 0.4)) {
  // Changes
}

18:21 - Spring Preset with Custom Bounce

withAnimation(.snappy(extraBounce: 0.1)) {
  // Changes
}

18:37 - Custom Spring

withAnimation(.spring(duration: 0.6, bounce: 0.2)) {
  // Changes
}

// UIKit
UIView.animate(duration: 0.6, bounce: 0.2) {
  // Changes
}

// Core Animation
let animation = CASpringAnimation(perceptualDuration: 0.6, bounce: 0.2)

18:57 - Spring Model

let mySpring = Spring(duration: 0.5, bounce: 0.2)
let (mass, stiffness, damping) = (mySpring.mass, mySpring.stiffness, mySpring.damping)

19:16 - Spring Model Animation

let otherSpring = Spring(mass: 1, stiffness: 100, damping: 10)
withAnimation(.spring(otherSpring)) {
    // Changes
}

19:26 - Spring Parameter Conversion

mass = 1

stiffness = (2π ÷ duration)^2

damping = 1 - 4π × bounce ÷ duration, bounce ≥ 0
          4π ÷ (duration + 4π × bounce), bounce < 0

19:35 - Evaluating Spring Model

let mySpring = Spring(duration: 0.4, bounce: 0.2)
let value = mySpring.value(target: 1, time: time)
let velocity = mySpring.velocity(target: 1, time: time)

20:15 - Custom Spring Animation

func animate<V: VectorArithmetic>(
    value: V, time: Double, context: inout AnimationContext<V>
) -> V? {
    spring.value(
        target: value, initialVelocity: context.initialVelocity,
        time: effectiveTime(time: time, context: context))
}

20:34 - Spring with No Bounce

withAnimation(.spring(duration: 0.5)) {
    isActive.toggle()
}

21:07 - Spring with Small Bounce

withAnimation(.spring(duration: 0.5, bounce: 0.15)) {
    isActive.toggle()
}

21:14 - Spring with Large Bounce

withAnimation(.spring(duration: 0.5, bounce: 0.3)) {
    isActive.toggle()
}