SwiftUI Textfield not actually making updates to data - swift

Question

I am trying to make an application where the user can see a list of foods and recipes and make changes etc. In the DetailView for each food, there is an EditView where the values can be changed. I am trying to use a double binding on the value by using #State to define the value and $food.name for example to make the changes happen.
When I click 'Done' and exit this view back to the DetailView, the changes are not made at all, leaving me confused?
Any help on this problem would be greatly appreciated, thank you :)
My EditView.swift:
import SwiftUI
struct EditView: View {
#State var food: Food
var body: some View {
List {
Section(header: Text("Name")) {
TextField("Name", text: $food.name)
}
Section(header: Text("Image")) {
TextField("Image", text: $food.image)
}
Section(header: Text("Desc")) {
TextField("Desc", text: $food.desc)
}
Section(header: Text("Story")) {
TextField("Story", text: $food.story)
}
}.listStyle(InsetGroupedListStyle())
}
}
struct EditView_Previews: PreviewProvider {
static var previews: some View {
EditView(food: cottonCandy)
}
}
My FoodDetail.swift:
import SwiftUI
struct FoodDetail: View {
#State var food: Food
#State private var isPresented = false
var body: some View {
VStack {
Image(food.image)
.resizable()
.frame(width: 300.0,height:300.0)
.aspectRatio(contentMode: .fill)
.shadow(radius: 6)
.padding(.bottom)
ScrollView {
VStack(alignment: .leading) {
Text(food.name)
.font(.largeTitle)
.fontWeight(.bold)
.padding(.leading)
.multilineTextAlignment(.leading)
Text(food.desc)
.italic()
.fontWeight(.ultraLight)
.padding(.horizontal)
.multilineTextAlignment(.leading)
Text(food.story)
.padding(.horizontal)
.padding(.top)
Text("Ingredients")
.bold()
.padding(.horizontal)
.padding(.vertical)
ForEach(food.ingredients, id: \.self) { ingredient in
Text(ingredient)
Divider()
}.padding(.horizontal)
Text("Recipe")
.bold()
.padding(.horizontal)
.padding(.vertical)
ForEach(food.recipe, id: \.self) { step in
Text(step)
Divider()
}.padding(.horizontal)
}.frame(maxWidth: .infinity)
}.frame(minWidth: 0,
maxWidth: .infinity,
maxHeight: .infinity,
alignment: .center
)
}
.navigationBarItems(trailing: Button("Edit") {
isPresented = true
})
.fullScreenCover(isPresented: $isPresented) {
NavigationView {
EditView(food: food)
.navigationTitle(food.name)
.navigationBarItems(leading: Button("Cancel") {
isPresented = false
}, trailing: Button("Done") {
isPresented = false
})
}
}
}
}
struct FoodDetail_Previews: PreviewProvider {
static var previews: some View {
Group {
FoodDetail(food: cottonCandy)
}
}
}

Answer 1

Inside EditView, you want to have a Binding. Replace
#State var food: Food
with
#Binding var food: Food
... then, you'll need to pass it in:
.fullScreenCover(isPresented: $isPresented) {
NavigationView {
EditView(food: $food) /// make sure to have dollar sign
.navigationTitle(food.name)
.navigationBarItems(leading: Button("Cancel") {
isPresented = false
}, trailing: Button("Done") {
isPresented = false
})
}
}