In xcode 9 with iOS 11 - issue with loading of Map tiles on first run

Question

--Updated with new findings -- Tested in both simulator and on device. Maps are not loaded correctly when the app is run from a cold start. Tiles are not being displayed.

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Answer 1

Had same problem my BROKEN code looked something like:

class ViewController: UIViewController {

    fileprivate var mapView = MKMapView()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Add the mapView to the VC
        mapView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(mapView)
        mapView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
        mapView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
        mapView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        mapView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
    }
}

As it turned out in iOS 11 it does not like having the MKMapView initialize before the view controller has loaded ie viewDidLoad() so FIX was changing to:

class ViewController: UIViewController {

    fileprivate var mapView: CSMapView?

    override func viewDidLoad() {
        super.viewDidLoad()

        // Init instance here.
        mapView = CSMapView()

        // Add the mapView to the VC
        mapView?.translatesAutoresizingMaskIntoConstraints = false
        ...
    }
}

Also tried putting it in init methods but this DID NOT work for me:

override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
    super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    mapView = MKMapView()
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    mapView = MKMapView()
}