mobile-ios/CovidSafe/UploadDataVC.swift

import UIKit
import CoreData

class UploadDataViewController: UIViewController {
    
    // MARK: - Local
    private var uploadStepsNavigationVC: UINavigationController?
    var _preferredScreenEdgesDeferringSystemGestures: UIRectEdge = []
    
    // MARK: - Delegates
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        NotificationCenter.default.addObserver(self, selector: #selector(enableDeferringSystemGestures(_:)), name: .enableDeferringSystemGestures, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(disableDeferringSystemGestures(_:)), name: .disableDeferringSystemGestures, object: nil)
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        // Reset the Steps navigation vc whenever user re-enter this tab
        uploadStepsNavigationVC?.popToRootViewController(animated: false)
        
    }
    
    override var preferredScreenEdgesDeferringSystemGestures: UIRectEdge {
        return _preferredScreenEdgesDeferringSystemGestures
    }
    
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    
    @objc
    func enableDeferringSystemGestures(_ notification: Notification) {
        if #available(iOS 11.0, *) {
            _preferredScreenEdgesDeferringSystemGestures = .bottom
            setNeedsUpdateOfScreenEdgesDeferringSystemGestures()
        }
    }
    
    @objc
    func disableDeferringSystemGestures(_ notification: Notification) {
        if #available(iOS 11.0, *) {
            _preferredScreenEdgesDeferringSystemGestures = []
            setNeedsUpdateOfScreenEdgesDeferringSystemGestures()
        }
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let vc = segue.destination as? UINavigationController {
            uploadStepsNavigationVC = vc
        }
    }
    
}