Description
Title of the view controller is not displayed for the 1st view controller in navigation stack.
Is there a way to show it?
Main problem is that selected tab is a UITabGroup and there's no way to understand which child of it is currently selected without opening the sidebar or guessing by the content.
Human Interface Guidelines
In the guidelines there are examples with title visible on the iPad in similar case:
https://developer.apple.com/design/human-interface-guidelines/tab-bars
Code
import UIKit
import SwiftUI
struct TestView: View {
var tab: UITab?
let id = UUID()
var body: some View {
ScrollView {
HStack {
Spacer()
VStack {
Text(tab?.title ?? id.uuidString)
}
Spacer()
}
.frame(height: 1000)
.background(.red)
.onTapGesture {
tab?.viewController?.navigationController?.pushViewController(
TestViewController(nil), animated: true
)
}
}
}
}
class TestViewController: UIHostingController<TestView> {
let _tab: UITab?
init(_ tab: UITab?) {
self._tab = tab
super.init(rootView: TestView(tab: _tab))
}
@MainActor @preconcurrency required dynamic init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = _tab?.title ?? "tab-nil"
}
}
class ViewController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
mode = .tabSidebar
let provider: (UITab) -> UIViewController = { tab in
print(tab)
return TestViewController(tab)
}
let tab1 = UITabGroup(
title: "Tab 1",
image: UIImage(systemName: "1.square.fill"),
identifier: "tab1",
children: [
UITab(title: "Sub 1",
image: UIImage(systemName: "1.circle"),
identifier: "First Tab",
viewControllerProvider: provider),
UITab(title: "Sub 2",
image: UIImage(systemName: "2.circle"),
identifier: "Second Tab",
viewControllerProvider: provider)
])
tab1.selectedChild = tab1.children[0]
tab1.managingNavigationController = UINavigationController()
let tab2 = UITabGroup(
title: "Tab 2",
image: UIImage(systemName: "2.square.fill"),
identifier: "Section one",
children:
[
UITab(
title: "Sub 1",
image: UIImage(systemName: "a.circle"),
identifier: "Section 1, item A",
viewControllerProvider: provider),
UITabGroup(title: "Sub Group", image: nil, identifier: "q",
children: [
UITab(
title: "Item 1",
image: UIImage(systemName: "b.circle"),
identifier: "c1",
viewControllerProvider: provider),
UITab(
title: "Item 2",
image: UIImage(systemName: "b.circle"),
identifier: "c2",
viewControllerProvider: provider)
],
viewControllerProvider: provider
),
]
)
tab2.selectedChild = tab2.children[0]
tab2.managingNavigationController = UINavigationController()
tabs = [
tab1,
tab2,
]
selectedTab = tab1
}
}
