refactor(route): show route in UIKit map when searched

StepMap/ContentView.swift

@@ -35,15 +35,6 @@ struct ContentView: View {
     // if user clicks on the place, display better view and then calculate route there
     var body: some View {
         MapView(locationManager: locationManager, viewModel: viewModel)
-        //        Map(position: $position) {
-        //            UserAnnotation()
-        //            ForEach(0..<directions.count) { i in
-        //                if destination != nil {
-        //                    Marker(item: destination!)
-        //                }
-        //                MapPolyline(directions[i].polyline)
-        //                    .stroke(Defaults.routeColor[i], lineWidth: Defaults.routeWidth)
-        //            }
             .ignoresSafeArea()
             .onAppear {
                 Task {

StepMap/SearchView.swift

@@ -43,6 +43,8 @@ struct SearchView: View {
                                     .foregroundStyle(.gray)
                                     .onTapGesture {
                                         query = ""
+                                        viewModel.destination = nil
+                                        viewModel.directions = []
                                     }
                             }
                         }

StepMap/UIKitMapView.swift

@@ -8,12 +8,14 @@
 import UIKit
 import MapKit
 import SwiftUI
+import Combine
 
 class UIKitMapView: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
     var locationManager: LocationManager
     var viewModel: ViewModel
-    var directions: [MKRoute] = []
-    var destination: MKMapItem?
+    var oldDirections: [MKRoute] = []
+    var oldDestination: MKMapItemAnnotation?
+    private var cancellables = Set<AnyCancellable>()
     let mapView : MKMapView = {
         let map = MKMapView()
         map.showsUserTrackingButton = true
@@ -34,6 +36,7 @@ class UIKitMapView: UIViewController, MKMapViewDelegate, CLLocationManagerDelega
     
     override func viewDidLoad() {
         super.viewDidLoad()
+        bindViewModel()
         
         mapView.delegate = self
         setMapConstraints()
@@ -83,6 +86,42 @@ class UIKitMapView: UIViewController, MKMapViewDelegate, CLLocationManagerDelega
         self.present(searchViewConctroller, animated: true, completion: nil)
     }
     
+    private func refreshRoute() {
+        DispatchQueue.main.async {
+            for route in self.oldDirections {
+                self.mapView.removeOverlay(route.polyline)
+            }
+            self.oldDirections = self.viewModel.directions
+            for route in self.viewModel.directions {
+                self.mapView.addOverlay(route.polyline, level: .aboveRoads)
+            }
+            
+            if let destination = self.oldDestination {
+                self.mapView.removeAnnotation(destination)
+            }
+            if let destination = self.viewModel.destination {
+                self.oldDestination = MKMapItemAnnotation(mapItem: destination)
+                self.mapView.addAnnotation(self.oldDestination!)
+            }
+        }
+    }
+    
+    func mapView(_ mapView: MKMapView, rendererFor overlay: any MKOverlay) -> MKOverlayRenderer {
+        let renderer = MKGradientPolylineRenderer(overlay: overlay)
+        renderer.setColors(Defaults.routeColor, locations: [])
+        renderer.lineCap = .round
+        renderer.lineWidth = Defaults.routeWidth
+        return renderer
+    }
+    
+    private func bindViewModel() {
+        viewModel.$directions
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refreshRoute()
+            }
+            .store(in: &cancellables)
+    }
 }
 
 struct MapView: UIViewControllerRepresentable {

StepMap/Utils.swift

@@ -10,10 +10,10 @@ import MapKit
 import SwiftUI
 
 struct Defaults {
-    static let routeColor: [Color] = [
+    static let routeColor: [UIColor] = [
         .blue,
-        .red,
-        .yellow,
+//        .red,
+//        .yellow,
     ]
     static let routeWidth: CGFloat = 8