IOS UISegmentedControl doesn't not display in ios 10 - ios

Question

I'm a beginner in IOS. I'm developping a Swift app and I am using a UISegmentedControl. It displays well in ios 11, but when I run my app on a IOS 10 device, the segmented control is not showing. Does anyone know why ?
Is the segmented control only available in IOS 11 ?
Here are the screenshots of my app (sorry I can't post images yet) :
IOS 11
IOS10
Here is my SegmentedViewController.swift :
import UIKit
import MMDrawerController
class SegmentedViewController: UIViewController {
#IBOutlet weak var viewContainer: UIView!
var segmentedController: UISegmentedControl!
var floorRequest:Int = 0
var segmentedControlIndex:Int = 0
lazy var travelViewController: TravelViewController = {
var viewController = self.initTravelViewController()
return viewController
}()
lazy var nearbyViewController: NearbyTableViewController = {
let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
var viewController = storyboard.instantiateViewController(withIdentifier: "NearbyTableViewController") as! NearbyTableViewController
self.addViewControllerAsChildViewController(childViewController: viewController)
return viewController
}()
var views: [UIView]!
let appDelegate:AppDelegate = UIApplication.shared.delegate as! AppDelegate
func initTravelViewController() -> TravelViewController {
let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
let viewController = storyboard.instantiateViewController(withIdentifier: "TravelViewController") as! TravelViewController
viewController.floorRequest = floorRequest
self.addViewControllerAsChildViewController(childViewController: viewController)
return viewController
}
override func viewDidLoad() {
super.viewDidLoad()
segmentedController = UISegmentedControl()
navigationItem.titleView = segmentedController
self.title = "TAB_BAR_MAP".localized()
}
override func viewWillAppear(_ animated: Bool) {
self.tabBarController?.navigationItem.title = "MENU_SECTION_TRAVEL".localized().uppercased()
// Navigation Bar
self.navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName : UIColor.white, NSFontAttributeName: UIFont(name: "Lato-Bold", size: 18)!]
self.navigationController?.navigationBar.tintColor = .white
self.navigationController?.navigationBar.barTintColor = appDelegate.colorAqaDark
self.navigationController?.navigationBar.isTranslucent = false
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
if (self.navigationController?.viewControllers.count)! < 2 {
let buttonLeft: UIButton = appDelegate.aqaBarButton(image: #imageLiteral(resourceName: "IconWhiteMenu"))
buttonLeft.addTarget(self, action: #selector(toggleMenu), for: .touchUpInside)
buttonLeft.frame = CGRect.init(x: 0, y: 0, width: 25, height: 25)
let buttonMenu = UIBarButtonItem(customView: buttonLeft)
self.navigationItem.setLeftBarButton(buttonMenu, animated: false);
}
setupView()
super.viewWillAppear(animated)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func toggleMenu() {
appDelegate.mainContainer!.toggle(MMDrawerSide.left, animated: true, completion: nil)
}
private func setupView(){
setupSegmentedControl()
updateView()
}
private func updateView(){
travelViewController.view.isHidden = !(segmentedController.selectedSegmentIndex == 0)
nearbyViewController.view.isHidden = (segmentedController.selectedSegmentIndex == 0)
segmentedControlIndex = segmentedController.selectedSegmentIndex
}
private func setupSegmentedControl(){
segmentedController.removeAllSegments()
segmentedController.insertSegment(withTitle: "TAB_BAR_MAP".localized(), at: 0, animated: false)
segmentedController.insertSegment(withTitle: "TAB_BAR_NEARBY".localized(), at: 1, animated: false)
segmentedController.addTarget(self, action: #selector(selectionDidChange(sender:)), for: .valueChanged)
segmentedController.selectedSegmentIndex = segmentedControlIndex
}
func selectionDidChange(sender: UISegmentedControl){
updateView()
}
private func addViewControllerAsChildViewController(childViewController: UIViewController){
addChildViewController(childViewController)
view.addSubview(childViewController.view)
childViewController.view.frame = view.bounds
childViewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
childViewController.didMove(toParentViewController: self)
}
}

Answer 1

The problem is that you are not giving the segmented control any size. In iOS 11 the title view is sized internally by autolayout, but not in iOS 10 or before. So you end up with a segmented control of zero size.