SwiftUI / Move object following a first geometry animation - swiftui

Question

Can you please help updating the code to move the green image text "One thing is for sure ....." just above its original position only once the first animation has terminated ?
(for instance just below the "Toggle" text)
Thanks,
Olivier
Can you please help updating the code to move the green image text "One thing is for sure ....." just above its original position only once the first animation has terminated ?
(for instance just below the "Toggle" text)
import SwiftUI
struct ContentView : View {
// #EnvironmentObject var showBack: Bool
#State var showBack = false
var body : some View {
VStack() {
ContentViewTest()
Spacer()
Text(String(self.showBack))
}
}
}
struct ContentViewTest : View {
#State var showBack = false
let sample1 = "If you know you have an unpleasant nature and dislike people, this is no obstacle to work."
let sample2 = "One thing is for sure – a sheep is not a creature of the air."
var body : some View {
let front = CardFace(text: sample1, background: Color.yellow)
let back = CardFace(text: sample2, background: Color.green)
let resetBackButton = Button(action: { self.showBack = true }) { Text("Back")}.disabled(showBack == true)
let resetFrontButton = Button(action: { self.showBack = false }) { Text("Front")}.disabled(showBack == false)
let animatedToggle = Button(action: {
withAnimation(Animation.linear(duration: 0.8)) {
self.showBack.toggle()
}
}) { Text("Toggle")}
return
VStack() {
HStack() {
resetFrontButton
Spacer()
animatedToggle
Spacer()
resetBackButton
}.padding()
Spacer()
Spacer()
Spacer()
Spacer()
FlipView(front: front, back: back, showBack: $showBack)
}
}
}
struct FlipView<SomeTypeOfViewA : View, SomeTypeOfViewB : View> : View {
var front : SomeTypeOfViewA
var back : SomeTypeOfViewB
#State private var flipped = false
#Binding var showBack : Bool
var body: some View {
return VStack {
Spacer()
ZStack() {
front.opacity(flipped ? 0.0 : 1.0)
back.opacity(flipped ? 1.0 : 0.0)
}
.modifier(FlipEffect(flipped: $flipped, angle: showBack ? 180 : 0, axis: (x: 1, y: 0)))
.onTapGesture {
withAnimation(Animation.linear(duration: 0.8)) {
self.showBack.toggle()
}
}
Spacer()
}
}
}
struct CardFace<SomeTypeOfView : View> : View {
var text : String
var background: SomeTypeOfView
var body: some View {
Text(text)
.multilineTextAlignment(.center)
.padding(5).frame(width: 250, height: 150).background(background)
}
}
struct FlipEffect: GeometryEffect {
var animatableData: Double {
get { angle }
set { angle = newValue }
}
#Binding var flipped: Bool
var angle: Double
let axis: (x: CGFloat, y: CGFloat)
func effectValue(size: CGSize) -> ProjectionTransform {
DispatchQueue.main.async {
self.flipped = self.angle >= 90 && self.angle < 270
}
let tweakedAngle = flipped ? -180 + angle : angle
let a = CGFloat(Angle(degrees: tweakedAngle).radians)
var transform3d = CATransform3DIdentity;
transform3d.m34 = -1/max(size.width, size.height)
transform3d = CATransform3DRotate(transform3d, a, axis.x, axis.y, 0)
transform3d = CATransform3DTranslate(transform3d, -size.width/2.0, -size.height/2.0, 0)
let affineTransform = ProjectionTransform(CGAffineTransform(translationX: size.width/2.0, y: size.height / 2.0))
return ProjectionTransform(transform3d).concatenating(affineTransform)
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}