space-ios/iOSClient/Main/NCMainNavigationController.swift

//
//  NCMainNavigationController.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 17/10/2020.
//  Copyright © 2020 Marino Faggiana. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import UIKit

class NCMainNavigationController: UINavigationController {

    // MARK: - View Life Cycle

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

        NotificationCenter.default.addObserver(self, selector: #selector(changeTheming), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterChangeTheming), object: nil)

        changeTheming()
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
    }

    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
        super.traitCollectionDidChange(previousTraitCollection)

        changeTheming()
    }

    // MARK: - Theming

    @objc func changeTheming() {

        if #available(iOS 13.0, *) {

            let appearance = UINavigationBarAppearance()

            appearance.configureWithOpaqueBackground()
            appearance.largeTitleTextAttributes = [NSAttributedString.Key.foregroundColor: NCBrandColor.shared.label]
            appearance.backgroundColor = NCBrandColor.shared.systemBackground
            appearance.configureWithOpaqueBackground()
            appearance.titleTextAttributes = [NSAttributedString.Key.foregroundColor: NCBrandColor.shared.label]
            appearance.backgroundColor = NCBrandColor.shared.systemBackground

            navigationBar.scrollEdgeAppearance = appearance
            navigationBar.standardAppearance = appearance

        } else {

            navigationBar.barStyle = .default
            navigationBar.barTintColor = NCBrandColor.shared.systemBackground
            navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor: NCBrandColor.shared.label]
            navigationBar.largeTitleTextAttributes = [NSAttributedString.Key.foregroundColor: NCBrandColor.shared.label]
        }

        navigationBar.tintColor = .systemBlue
        navigationBar.setNeedsLayout()
    }
}