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 {
    
    private let appDelegate = UIApplication.shared.delegate as! AppDelegate

    // 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()
    }
}