SwiftUI: Animation

Mar 29 2022 · Swift 5.5, iOS 15, Xcode 13

Part 1: Beginning with SwiftUI Animation

07. Multiple Stages

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00:02As always, remember that all layout changes on screen in SwiftUI are triggered by changes to your state. Currently, you have a single state property which sets which leaf is currently animated.

  @State var currentIndex = -1
  🟩@State var completed = false
  
  var body: some View {

  func animate() {
    var iteration = 0

    Timer.scheduledTimer(withTimeInterval: 0.15, repeats: true) {

      currentIndex = (currentIndex + 1) % leavesCount

      iteration += 1
    }

      iteration += 1
      if iteration == 30 {
        timer.invalidate()
        completed = true
      }
    }

    let isCurrent: Bool
    let isCompleting: Bool

    var body: some View {

            isCurrent: index == currentIndex,
            isCompleting: completed
          )

        .scaleEffect(isCurrent ? 0.5 : 1)
        🟩.rotationEffect(isCompleting ? .zero : rotation)
        🟩.animation(.easeIn(duration: 1.5), value: isCompleting)
        .animation(.easeIn(duration: 1.5), value: isCurrent)

        .stroke(isCurrent ? Color.white : .gray, lineWidth: 8)
        🟩.frame(width: 20, height: isCompleting ? 20 : 50)
        .offset(

        completed = true
        currentIndex = -1
      }

  @State var completed = false
  @State var isVisible = true
  
  var body: some View {

  var body: some View {
    VStack {
      if isVisible {
        ZStack {
          ForEach(0..<leavesCount) { index in
            Leaf(
              rotation: .init(degrees: .init(index) / .init(leavesCount) * 360),
              isCurrent: index == currentIndex,
              isCompleting: completed
            )
          }
        }
        .onAppear(perform: animate)
      }
    }
  }

currentIndex = -1
DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(2)) {
  isVisible = false
}

withAnimation {
  isVisible = false
}

  @State var isVisible = true

  let shootUp =
    AnyTransition.offset(x: 0, y: -1000)
  
  var body: some View {

    AnyTransition.offset(x: 0, y: -1000)
    .animation(.easeIn(duration: 1))
  
  var body: some View {

        }
        .transition(shootUp)
        .onAppear(perform: animate)