comaps/iphone/Maps/Bridging/BridgeControllers.swift

import SwiftUI
import UIKit

/// Class for accesing SwiftUI views from Objective-C code
@objc class BridgeControllers: NSObject {
    /// The `ProfileView` for presentation in an alert
    @objc static func profileAsAlert() -> UIViewController {
        let profileBridgeController = UIHostingController(rootView: ProfileView(isPresentedAsAlert: true))
        profileBridgeController.view.backgroundColor = .systemGroupedBackground
        return profileBridgeController
    }
    
    /// The `RoutingOptionsView` for presentation in an alert
    @objc static func routingOptions() -> UIViewController {
        let routinOptionsBridgeController = UIHostingController(rootView: RoutingOptionsView())
        routinOptionsBridgeController.view.backgroundColor = .systemGroupedBackground
        return routinOptionsBridgeController
    }
}

final class BridgeCell<Content: View>: UITableViewCell {
    private let hostingController = UIHostingController<Content?>(rootView: nil)

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        hostingController.view.backgroundColor = .clear
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("Has not been implemented")
    }

    func layout() {
        self.hostingController.view.invalidateIntrinsicContentSize()
    }
    
    func set(content: Content, parentController: UIViewController) {
        self.hostingController.rootView = content
        self.hostingController.view.invalidateIntrinsicContentSize()

        let requiresControllerMove = hostingController.parent != parentController
        if requiresControllerMove {
            parentController.addChild(hostingController)
        }

        if !self.contentView.subviews.contains(hostingController.view) {
            self.contentView.addSubview(hostingController.view)
            hostingController.view.translatesAutoresizingMaskIntoConstraints = false
            hostingController.view.leadingAnchor.constraint(equalTo: self.contentView.leadingAnchor).isActive = true
            hostingController.view.trailingAnchor.constraint(equalTo: self.contentView.trailingAnchor).isActive = true
            hostingController.view.topAnchor.constraint(equalTo: self.contentView.topAnchor).isActive = true
            hostingController.view.bottomAnchor.constraint(equalTo: self.contentView.bottomAnchor).isActive = true
        }

        if requiresControllerMove {
            hostingController.didMove(toParent: parentController)
        }
    }
}

/// Class for using the SwiftUI `AboutView` in the interface builder
class AboutBridgeController: UIHostingController<AboutView> {
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder, rootView: AboutView())
    }
}



/// Class for using the SwiftUI `SettingsView` in the interface builder
class SettingsBridgeController: UIHostingController<SettingsView> {
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder, rootView: SettingsView())
    }
}



/// Class for using the SwiftUI `ProfileView` in the interface builder
class ProfileBridgeController: UIHostingController<ProfileView> {
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder, rootView: ProfileView())
        self.view.tintColor = .toolbarAccent
    }
}