TabView animation glitch - ios

Question

Get that strange glitch and can't fix it.
Source of problem - TabView and changing size of child views with animation.
Changing UITabbar appearance not helped. Changing safe area options not helped.
UITabBar.appearance().isHidden = false and opaque appearance give flickering of whole tabbar.
I want to hide default UITabbar to customize my own.
Any ideas?
Flickering of bottom safe area: Demonstration GIF
Sample project:
struct ContentView: View {
#State var selected = "second"
var body: some View {
ZStack(alignment: .bottom) {
VStack(spacing: 0) {
FirstView()
TabView(selection: $selected) {
SecondView()
.tabItem({
Text("second")
})
.tag("second")
ThirdView()
.tabItem({
Text("third")
})
.tag("third")
}
}
HStack {
Image(systemName: selected == "second" ? "circle.fill" : "circle")
.onTapGesture {
selected = "second"
}
Image(systemName: selected == "third" ? "circle.fill" : "circle")
.onTapGesture {
selected = "third"
}
}
.frame(width: 70, height: 40, alignment: .center)
.background(Color.white)
.cornerRadius(10)
.padding()
}
.edgesIgnoringSafeArea(.all)
.onAppear {
UITabBar.appearance().isHidden = true
}
}
}
struct FirstView: View {
#State var height:CGFloat = 200
var body: some View {
ZStack(alignment: .bottom) {
Color.red
.frame(height: height)
Image(systemName: height == 200 ? "arrow.down" : "arrow.up")
.foregroundColor(.white)
.padding(5)
.onTapGesture {
withAnimation(.easeInOut(duration: 2)) {
height = height == 200 ? 350 : 200
}
}
}
}
}
struct SecondView: View {
var body: some View {
ZStack {
Text("hello")
}
.frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .center)
.background(Color.green)
.onAppear {
UITabBar.appearance().isHidden = true
}
}
}
struct ThirdView: View {
var body: some View {
Color.blue
.edgesIgnoringSafeArea(.bottom)
}
}
Thanks for answers :)

Answer 1

Since you have your own index navigation anyways, I recommend to get rid of TabView altogether and switch views by if / else or switch statements:
struct ContentView: View {
#State var selected = "second"
var body: some View {
ZStack(alignment: .bottom) {
VStack(spacing: 0) {
FirstView()
if selected == "second" {
SecondView()
} else {
ThirdView()
}
}
HStack {
Image(systemName: selected == "second" ? "circle.fill" : "circle")
.onTapGesture {
selected = "second"
}
Image(systemName: selected == "third" ? "circle.fill" : "circle")
.onTapGesture {
selected = "third"
}
}
.frame(width: 70, height: 40, alignment: .center)
.background(Color.white)
.cornerRadius(10)
.padding()
}
.edgesIgnoringSafeArea(.all)
}
}