SwiftUI Status bar customization

ContentView.swift

//
//  ContentView.swift
//  TestingGround
//
//  Created by Brian Dashore on 12/31/21.
//

import SwiftUI
import Introspect

struct ContentView: View {
    @StateObject var hostingViewController: HostingViewController = .init(rootViewController: nil, style: .default)

    @State var bgColor: Color = .yellow
    @State var showSheet: Bool = false
    
    var body: some View {
        ZStack {
            bgColor
                .ignoresSafeArea()

            VStack(spacing: 30) {
                Button("Light color") {
                    bgColor = .yellow
                }

                Button("Dark color") {
                    bgColor = .black
                }

                Button("Show sheet") {
                    showSheet.toggle()
                }
                .sheet(isPresented: $showSheet) {
                    InnerView()
                }
            }
        }
        // You can use any way to grab the rootViewController, but I want to use Introspect
        .introspectViewController { viewController in
            // Grab the root view controller from the UIWindow and set that to the hosting controller
            let window = viewController.view.window
            guard let rootViewController = window?.rootViewController else { return }
            hostingViewController.rootViewController = rootViewController

            // Ignore system dark mode color inversion
            hostingViewController.ignoreDarkMode = true

            // Hide the statusbar. Overriding the hosting controller disables the statusbar view modifier
            hostingViewController.isHidden = false

            // Set the window's root view controller to the hosting controller subclass
            window?.rootViewController = hostingViewController
        }
        .onChange(of: bgColor) { newColor in
            // darkContent is used for light backgrounds and vice versa
            if newColor.isLight {
                hostingViewController.style = .darkContent
            } else {
                hostingViewController.style = .lightContent
            }
        }
    }
}

struct InnerView: View {
    var body: some View {
        Text("Hello, world!")
    }
}

HostingViewController.swift

//
//  HostingViewController.swift
//  TestingGround
//
//  Created by Brian Dashore on 4/7/22.
//

import UIKit

// Inspired by Thomas Rademaker's UIHosting controller
// Article: https://barstool.engineering/set-the-ios-status-bar-style-in-swiftui-using-a-custom-view-modifier/

// This code is used in Asobi if you want a practical example:
// https://github.com/bdashore3/Asobi/blob/next/Asobi/RepresentableViews/HostingViewController.swift

// ObservableObject to observe statusbar changes and set accordingly
class HostingViewController: UIViewController, ObservableObject {
    // The main controller to customize
    var rootViewController: UIViewController?

    // The statusbar style, updates on change
    var style: UIStatusBarStyle = .lightContent {
        didSet {
            // Can remove the animation block
            UIView.animate(withDuration: 0.3) {
                 self.rootViewController?.setNeedsStatusBarAppearanceUpdate()
            }
        }
    }

    // If the statusbar is hidden. Subclassing breaks SwiftUI's statusbar modifier, so handle hiding here
    var isHidden: Bool = false {
        didSet {
            // Can remove the animation block
            UIView.animate(withDuration: 0.3) {
                self.rootViewController?.setNeedsStatusBarAppearanceUpdate()
            }
        }
    }

    // Ignore dark mode color inversion
    var ignoreDarkMode: Bool = false

    init(rootViewController: UIViewController?, style: UIStatusBarStyle, ignoreDarkMode: Bool = false) {
        self.rootViewController = rootViewController
        self.style = style
        self.ignoreDarkMode = ignoreDarkMode
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        guard let child = rootViewController else { return }
        addChild(child)
        view.addSubview(child.view)
        child.didMove(toParent: self)
    }

    override var preferredStatusBarStyle: UIStatusBarStyle {
        if ignoreDarkMode || traitCollection.userInterfaceStyle == .light {
            return style
        } else {
            if style == .darkContent {
                return .lightContent
            } else {
                return .darkContent
            }
        }
    }

    override var prefersStatusBarHidden: Bool {
        return isHidden
    }

    // Can change this to whatever animation you want
    override var preferredStatusBarUpdateAnimation: UIStatusBarAnimation {
        return .fade
    }

    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
        setNeedsStatusBarAppearanceUpdate()
    }
}