Keyboard in a sheet's - ios

Question

I have a basic window with an input field (page 1), on top of it appears a popup window (page 2), inside of which there is also an input fields and buttons, which, when clicked, will bring up a small window with an input field (page 3). If there is no "Done" on the keyboard, the interface functions normally. If you add a "Done" button, it turns out that its color changes from system color blue to gray when moving from page 2 to page 3. Experimenting and wondering why this is so, I found that the toolbar on page 1 is responsible for the color of the button on page 3... If you change the color of the button on the toolbar on page 1 - it will change on the toolbar on page 3, and page 2 will not be affected. Also, adding buttons causes error: "[LayoutConstraints] Unable to simultaneously satisfy constraints." I want to understand why setting the button on the keyboard for Page 1, I also get a button when I type on Page 3? And why is it grayed out and not working? Why if I change the color for the button on Page 1, does it also change for that gray button on Page 3?
A small representative sample:
ContentView
import SwiftUI
struct ContentView: View {
#State private var bloodClucoseLvl: String = ""
#State private var isSheetShown: Bool = false
#FocusState private var focusField: Bool
var body: some View {
NavigationView {
List {
Section("Add your current blood glucose lvl") {
TextField("5,0 mmol/l", text: $bloodClucoseLvl)
.focused($focusField)
}
Section("Add food or drink") {
Button(action:{
isSheetShown.toggle()
}, label:{
HStack{
Text("Add")
Image(systemName: "folder.badge.plus")
}
})
.sheet(isPresented: $isSheetShown) {
addFoodButton()
}
}
}
.navigationTitle("Page 1 - General")
.toolbar{
ToolbarItem(placement: .keyboard) {
HStack {
Spacer()
Button(action: {
focusField = false
}) {
Text("Done")
}
}
}
}
.ignoresSafeArea(.keyboard)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
addFoodButton
import SwiftUI
struct addFoodButton: View {
#State private var selectedFood: String = ""
#State public var addScreen: Bool = false
var body: some View {
ZStack {
NavigationView {
List {
Section("or choose from category"){
NavigationLink(destination: Alcohol(addScreen: $addScreen)){
Text("Alcohol")
}
}
}
.listStyle(.insetGrouped)
.searchable(text: $selectedFood, prompt: "Search by word")
.navigationTitle("Page 2 - Search in DB")
}
if addScreen{
addScreenView(addScreen: $addScreen)
}
}
}
}
struct Alcohol: View {
#State private var searchInsideCategory: String = ""
#Binding var addScreen: Bool
var body: some View {
List {
Button(action: {addScreen.toggle()}){
Text("Light beer")
}
}
.navigationTitle("Page 2 - Choose beer")
.searchable(text: $searchInsideCategory, prompt: "Search inside a category")
}
}
struct addFoodButton_Previews: PreviewProvider {
static var previews: some View {
addFoodButton()
}
}
addScreenView
import SwiftUI
struct addScreenView: View {
#Binding var addScreen: Bool
#State private var gram: String = ""
var body: some View {
ZStack{
Color.black.opacity(0.2).ignoresSafeArea()
VStack(spacing:0){
Text("Page 3 - Add an item")
.bold()
.padding()
Divider()
VStack(){
TextField("gram", text: $gram)
.padding(.leading, 16)
.padding(.trailing, 16)
.keyboardType(.numberPad)
Rectangle()
.frame(height: 1)
.padding(.leading, 16)
.padding(.trailing, 16)
}.padding()
Divider()
HStack(){
Button(action: {
addScreen.toggle()
}){
Text("Cancel").frame(minWidth:0 , maxWidth: .infinity)
}
Divider()
Button(action: {
addScreen.toggle()
}){
Text("Save").frame(minWidth:0 , maxWidth: .infinity)
}
}.frame(height: 50)
}
.background(Color.white.cornerRadius(10))
.padding([.leading, .trailing], 15)
}
}
}
struct addScreenView_Previews: PreviewProvider {
static var previews: some View {
addScreenView(addScreen: .constant(true))
}
}