As bridge to UIKit is officially allowed and documented, it is possible to read needed information from there when needed.
Here is possible approach to read tab bar height directly from UITabBar
// Helper bridge to UIViewController to access enclosing UITabBarController
// and thus its UITabBar
struct TabBarAccessor: UIViewControllerRepresentable {
var callback: (UITabBar) -> Void
private let proxyController = ViewController()
func makeUIViewController(context: UIViewControllerRepresentableContext<TabBarAccessor>) ->
UIViewController {
proxyController.callback = callback
return proxyController
}
func updateUIViewController(_ uiViewController: UIViewController, context: UIViewControllerRepresentableContext<TabBarAccessor>) {
}
typealias UIViewControllerType = UIViewController
private class ViewController: UIViewController {
var callback: (UITabBar) -> Void = { _ in }
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let tabBar = self.tabBarController {
self.callback(tabBar.tabBar)
}
}
}
}
// Demo SwiftUI view of usage
struct TestTabBar: View {
var body: some View {
TabView {
Text("First View")
.background(TabBarAccessor { tabBar in
print(">> TabBar height: \(tabBar.bounds.height)")
// !! use as needed, in calculations, @State, etc.
})
.tabItem { Image(systemName: "1.circle") }
.tag(0)
Text("Second View")
.tabItem { Image(systemName: "2.circle") }
.tag(1)
}
}
}