SwiftUI Elements move down between views - swiftui

Question

I have two views
import SwiftUI
import CoreData
struct ContentView: View {
var body: some View {
NavigationView {
VStack {
Image("qr-code")
.resizable()
.scaledToFit()
.position(x: 100, y: 100)
.offset(x: 100)
Text("Thank you")
.position(x: 200)
}.toolbar{
ToolbarItemGroup(placement: .bottomBar) {
NavigationLink(destination: ContentView().navigationBarBackButtonHidden(true)) {
Text("Show QR")
}
Spacer()
NavigationLink(destination: CustomizeView().navigationBarBackButtonHidden(true)) {
Text("Customize")
}
}
}
}
}
}
struct CustomizeView: View {
var body: some View {
List {
Section(header: Text("Important tasks")) {
Text("Task data goes here")
Text("Task data goes here")
}
}.toolbar{
ToolbarItemGroup(placement: .bottomBar) {
NavigationLink(destination: ContentView().navigationBarBackButtonHidden(true)) {
Text("Show QR")
}
Spacer()
NavigationLink(destination: CustomizeView().navigationBarBackButtonHidden(true)) {
Text("Customize")
}
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
Group {
ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
CustomizeView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
}
}
}
When I click on Customize and the click on Show, I see that the picture moves down. Is it expected behavior? How can I make sure that all elements are in the same positions regardless of how much I clicked on nvaigation buttons?

Answer 1

You should only have one NavigationView in your view hierarchy.
Right now, there are NavigationViews in ContentView and in CustomizeView any time you navigate to either with a NavigationLink, it will add an additional navigation bar to the view, pushing down your content.
To fix this, your root view could just be the NavigationView and then you links could navigation to views that do not contain additional NavigationViews.
struct ContentView: View {
var body: some View {
NavigationView {
BasicView()
}
}
}
struct BasicView : View {
var body: some View {
VStack {
Image(systemName: "pencil")
.resizable()
.scaledToFit()
.position(x: 100, y: 100)
.offset(x: 100)
Text("Thank you")
.position(x: 200)
}.toolbar{
ToolbarItemGroup(placement: .bottomBar) {
NavigationLink(destination: BasicView().navigationBarBackButtonHidden(true)) {
Text("Show QR")
}
Spacer()
NavigationLink(destination: CustomizeView().navigationBarBackButtonHidden(true)) {
Text("Customize")
}
}
}
}
}
struct CustomizeView: View {
var body: some View {
List {
Section(header: Text("Important tasks")) {
Text("Task data goes here")
Text("Task data goes here")
}
}.toolbar{
ToolbarItemGroup(placement: .bottomBar) {
NavigationLink(destination: BasicView().navigationBarBackButtonHidden(true)) {
Text("Show QR")
}
Spacer()
NavigationLink(destination: CustomizeView().navigationBarBackButtonHidden(true)) {
Text("Customize")
}
}
}
}
}

Answer 2

The problem is, I think you have called another ContentView from a ContentView. That's why one more navigation bar is added and shifted
You can create another view called QRShowView and place the qr image there and you have already CustomizeView view . Add two buttons in ContentView like show or customized.
Then call the respective view when is clicked.