MapKit Map with child view won't add annotations - ios

Question

I'm currently trying to implement a Map connected with a search function. For the overlay containing the table view, I've decided to go for a library called FloatingPanel. Anyways, this shouldn't be of importance, since it shouldn't affect the essential code etc.
The data is being read inside of SearchResultsTableViewController and passed to MapViewController by passData().
Inside of passData() a function called addAnnotationToMap() from MapViewController is being called to process the data - printing inside of the function will always return the correct value.
Inside of the function I'm trying to add an annotation to the map, but it won't work. Nothing happens - but when I do print(mapView.annotations) the Array of annotations is being returned including mine.
By the way, I had to add loadViewIfNeeded() to the MapViewController because without (after using the overlay view) mapView returned nil.
Sorry for the amount of code - but there might be some relevant code. I didn't include the code for the table view.
MapViewController
class MapViewController: UIViewController, FloatingPanelControllerDelegate, UISearchBarDelegate {
var fpc: FloatingPanelController!
var searchVC = SearchResultTableViewController()
private enum AnnotationReuseID: String {
case pin
}
#IBOutlet private var mapView: MKMapView!
var mapItems: [MKMapItem]?
var boundingRegion: MKCoordinateRegion?
override func viewDidLoad() {
super.viewDidLoad()
if let region = boundingRegion {
mapView.region = region
}
fpc = FloatingPanelController()
fpc.delegate = self
// Initialize FloatingPanelController and add the view
fpc.surfaceView.backgroundColor = .clear
fpc.surfaceView.cornerRadius = 9.0
fpc.surfaceView.shadowHidden = false
searchVC = (storyboard?.instantiateViewController(withIdentifier: "SearchPanel") as! SearchResultTableViewController)
// Set a content view controller
fpc.set(contentViewController: searchVC)
fpc.track(scrollView: searchVC.tableView)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// Add FloatingPanel to a view with animation.
fpc.addPanel(toParent: self, animated: true)
fpc.move(to: .tip, animated: true)
// Must be here
searchVC.searchController.searchBar.delegate = self
}
func addAnnotationToMap() {
loadViewIfNeeded()
guard let item = mapItems?.first else { return }
guard let coordinate = item.placemark.location?.coordinate else { return }
let annotation = MKPointAnnotation()
annotation.title = item.name
annotation.coordinate = coordinate
mapView.addAnnotation(annotation)
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searchBar.resignFirstResponder()
searchBar.showsCancelButton = false
fpc.move(to: .tip, animated: true)
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
searchBar.showsCancelButton = true
searchVC.tableView.alpha = 1.0
fpc.move(to: .full, animated: true)
searchVC.hideHeader()
}
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
fpc.move(to: .half, animated: true)
searchVC.showHeader()
}
func floatingPanelDidMove(_ vc: FloatingPanelController) {
let y = vc.surfaceView.frame.origin.y
let tipY = vc.originYOfSurface(for: .tip)
if y > tipY - 44.0 {
let progress = max(0.0, min((tipY - y) / 44.0, 1.0))
self.searchVC.tableView.alpha = progress
}
}
func floatingPanelWillBeginDragging(_ vc: FloatingPanelController) {
if vc.position == .full {
searchVC.searchBar.showsCancelButton = false
searchVC.searchBar.resignFirstResponder()
}
}
func floatingPanelDidEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetPosition: FloatingPanelPosition) {
UIView.animate(withDuration: 0.25,
delay: 0.0,
options: .allowUserInteraction,
animations: {
if targetPosition == .tip {
self.searchVC.tableView.alpha = 0.0
self.searchVC.hideHeader()
} else if targetPosition == .half {
self.searchVC.tableView.alpha = 1.0
self.searchVC.showHeader()
} else {
self.searchVC.tableView.alpha = 1.0
self.searchVC.hideHeader()
}
}, completion: nil)
}
}
SearchViewController
class SearchResultTableViewController: UIViewController {
#IBOutlet weak var searchBar: UISearchBar!
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var visualEffectView: UIVisualEffectView!
private enum CellReuseID: String {
case resultCell
}
private var places: [MKMapItem]? {
didSet {
tableView.reloadData()
}
}
private var suggestionController: SuggestionsTableTableViewController!
var searchController: UISearchController!
private var localSearch: MKLocalSearch? {
willSet {
places = nil
localSearch?.cancel()
}
}
private var boundingRegion: MKCoordinateRegion?
override func awakeFromNib() {
super.awakeFromNib()
suggestionController = SuggestionsTableTableViewController()
suggestionController.tableView.delegate = self
searchController = UISearchController(searchResultsController: suggestionController)
searchController.searchResultsUpdater = suggestionController
searchController.searchBar.isUserInteractionEnabled = false
searchController.searchBar.alpha = 0.5
}
override func viewDidLoad() {
super.viewDidLoad()
searchBar.addSubview(searchController.searchBar)
searchController.searchBar.searchBarStyle = .minimal
searchController.searchBar.tintColor = .black
searchController.searchBar.isUserInteractionEnabled = true
searchController.dimsBackgroundDuringPresentation = false
definesPresentationContext = true
hideHeader()
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
if #available(iOS 10, *) {
visualEffectView.layer.cornerRadius = 9.0
visualEffectView.clipsToBounds = true
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
}
func showHeader() {
changeHeader(height: 116.0)
}
func hideHeader() {
changeHeader(height: 0.0)
}
func changeHeader(height: CGFloat) {
tableView.beginUpdates()
if let headerView = tableView.tableHeaderView {
UIView.animate(withDuration: 0.25) {
var frame = headerView.frame
frame.size.height = height
self.tableView.tableHeaderView?.frame = frame
}
}
tableView.endUpdates()
}
func passData() {
guard let mapViewController = storyboard?.instantiateViewController(withIdentifier: "map") as? MapViewController else { return }
guard let mapItem = places?.first else { return }
guard let coordinate = mapItem.placemark.location?.coordinate else { return }
let span = MKCoordinateSpan(latitudeDelta: coordinate.latitude, longitudeDelta: coordinate.longitude)
let region = MKCoordinateRegion(center: coordinate, span: span)
mapViewController.boundingRegion = region
mapViewController.mapItems = [mapItem]
mapViewController.addAnnotationToMap()
}
private func search(for suggestedCompletion: MKLocalSearchCompletion) {
let searchRequest = MKLocalSearch.Request(completion: suggestedCompletion)
search(using: searchRequest)
}
private func search(for queryString: String?) {
let searchRequest = MKLocalSearch.Request()
searchRequest.naturalLanguageQuery = queryString
search(using: searchRequest)
}
private func search(using searchRequest: MKLocalSearch.Request) {
if let region = boundingRegion {
searchRequest.region = region
}
UIApplication.shared.isNetworkActivityIndicatorVisible = true
localSearch = MKLocalSearch(request: searchRequest)
localSearch?.start { [weak self] (response, error) in
if error == nil {
self?.passData()
} else {
self?.displaySearchError(error)
return
}
self?.places = response?.mapItems
self?.boundingRegion = response?.boundingRegion
UIApplication.shared.isNetworkActivityIndicatorVisible = false
}
}
private func displaySearchError(_ error: Error?) {
if let error = error as NSError?, let errorString = error.userInfo[NSLocalizedDescriptionKey] as? String {
let alertController = UIAlertController(title: "Could not find any places.", message: errorString, preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
present(alertController, animated: true, completion: nil)
}
}
}