Corrupted Navigation Views - list

Question

I'm pretty sure this is a bug in SwiftUI, but I wondered if anyone has encountered it and figured out a workaround. My normal use case is to have a search field appear, but I've simplified it to the point where a simple text string exhibits the bug.
Create a single-view app, copy this into ContentView, and run it. Tap the search icon twice, then scroll the view; you'll see the text scrolling UNDER the title.
import SwiftUI
struct ContentView: View {
private var items = (0 ... 50).map {String($0)}
#State private var condition = false
var searchButton: some View {
Button(action: {self.condition.toggle()}) {
Image(systemName: "magnifyingglass").imageScale(.large)
}
}
var body: some View {
NavigationView {
VStack {
if condition {
Text("Peekaboo")
}
List {
ForEach(items, id: \.self) {item in
HStack {
Text(item)
}
}
}
}
.navigationBarTitle("List of Items")
.navigationBarItems(leading: searchButton)
}
}
}

Answer 1

Maybe it is a bug, submit feedback to Apple, but currently this is how NavigationView behaves - it collapses navigation bar only if its top content is List/ScrollView/Form. So to solve the issue move your VStack either into a List or out of NavigationView
1)
var body: some View {
NavigationView {
List {
if condition {
Text("Peekaboo")
}
ForEach(items, id: \.self) {item in
2)
var body: some View {
VStack {
if condition {
Text("Peekaboo")
}
NavigationView {
List {

Answer 2

It seems that a View cannot cope with variable number of views.
A workaround this strange behavior is this:
import SwiftUI
struct ContentView: View {
private var items = (0 ... 50).map {String($0)}
#State private var condition = false
var searchButton: some View {
Button(action: {self.condition.toggle()}) {
Image(systemName: "magnifyingglass").imageScale(.large)
}
}
var body: some View {
NavigationView {
VStack {
if condition {
Text("Peekaboo")
} else {
Text("")
}
// or use this Text(condition ? "Peekaboo" : "")
List {
ForEach(items, id: \.self) {item in
HStack {
Text(item)
}
}
}
}
.navigationBarTitle("List of Items")
.navigationBarItems(leading: searchButton)
}
}
}
Let me know if it works, if not let us know what device/system you are using. Tested with Xcode 11.6 beta, Mac 10.15.5, target ios 13.5 and mac catalyst.