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swiftswiftuiuikit

UIBarButtonItem with custom view doesn't work with UIHostingController

Assume we have UIWindow with UINavigationController as rootViewController.

window = UIWindow()
window!.makeKeyAndVisible()
let navigationController = UINavigationController()
window.rootViewController = navigationController

And then a basic UIHostingController with some dummy SwiftUI view.

let controller = UIHostingController(rootView: SomeView())
navigatonController.setViewControllers([controller], animated: false)

My problem is, that when I want to add UIBarButtonItem to UIHostingController it doesn't work and act like its nil (no frame in Debug View Hierarchy).

controller.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: CustomButton())

When I change the exact same code from UIHostingController to just UIViewController it works fine.

controller = UIViewController()

Any ideas how to fix this?

Solution

  • Use working variant with

    let controller = UIViewController()
controller.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: CustomButton())

    and inject hosting controller as child of that controller

    let hosting = UIHostingController(rootView: SomeView())
controller.view.addSubview(hosting.view)

// set up view constraints here for `hosting.view`

controller.addChild(hosting)
hosting.didMove(toParent: controller)