TransactionsContentView.swift

import SwiftUI

struct RectangleView: View {
  let colour: Color
  var body: some View {
    Rectangle()
      .foregroundColor(colour)
      .animation(.linear, value: colour)
  }
}

struct ContentView: View {
  @State private var colour: Color = .blue
  @State var animationEnabled = false
  
  var body: some View {
    VStack {
      Toggle("Ease In", isOn: $animationEnabled)
      RectangleView(colour: colour)
        .onTapGesture {
          var transaction = Transaction(animation: .easeIn(duration: 1))
          transaction.disablesAnimations = animationEnabled
          withTransaction(transaction) {
            if colour == .blue { colour = .red }
            else { colour = .blue }
          }
        }
    }
    .padding()
  }
}