Add Async image loading

Examples/Drawing Paths And Shapes/StartingPoint/Landmarks/Landmarks/Supporting Views/CircleImage.swift

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+/*
+See LICENSE folder for this sample’s licensing information.
+
+Abstract:
+A view that clips an image to a circle and adds a stroke and shadow.
+*/
+
+import SwiftUI
+
+struct CircleImage: View {
+    var image: Image
+
+    var body: some View {
+        image
+            .clipShape(Circle())
+            .overlay(Circle().stroke(Color.white, lineWidth: 4))
+            .shadow(radius: 10)
+    }
+}
+
+#if DEBUG
+struct CircleImage_Previews: PreviewProvider {
+    static var previews: some View {
+        CircleImage(image: Image("turtlerock"))
+    }
+}
+#endif

Examples/Drawing Paths And Shapes/StartingPoint/Landmarks/Landmarks/Supporting Views/LandmarkRow.swift

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+/*
+See LICENSE folder for this sample’s licensing information.
+
+Abstract:
+A single row to be displayed in a list of landmarks.
+*/
+
+import SwiftUI
+
+struct LandmarkRow: View {
+    var landmark: Landmark
+
+    var body: some View {
+        HStack {
+            landmark.image(forSize: 50)
+            Text(verbatim: landmark.name)
+            Spacer()
+
+            if landmark.isFavorite {
+                Image(systemName: "star.fill")
+                    .imageScale(.medium)
+                    .foregroundColor(.yellow)
+            }
+        }
+    }
+}
+
+#if DEBUG
+struct LandmarkRow_Previews: PreviewProvider {
+    static var previews: some View {
+        Group {
+            LandmarkRow(landmark: landmarkData[0])
+            LandmarkRow(landmark: landmarkData[1])
+        }
+        .previewLayout(.fixed(width: 300, height: 70))
+    }
+}
+#endif

Examples/Drawing Paths And Shapes/StartingPoint/Landmarks/Landmarks/Supporting Views/MapView.swift

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+/*
+See LICENSE folder for this sample’s licensing information.
+
+Abstract:
+A view that hosts an `MKMapView`.
+*/
+
+import SwiftUI
+import MapKit
+
+struct MapView: UIViewRepresentable {
+    var coordinate: CLLocationCoordinate2D
+
+    func makeUIView(context: Context) -> MKMapView {
+        MKMapView(frame: .zero)
+    }
+
+    func updateUIView(_ view: MKMapView, context: Context) {
+        let span = MKCoordinateSpan(latitudeDelta: 0.02, longitudeDelta: 0.02)
+        let region = MKCoordinateRegion(center: coordinate, span: span)
+        view.setRegion(region, animated: true)
+    }
+}
+
+#if DEBUG
+struct MapView_Previews: PreviewProvider {
+    static var previews: some View {
+        MapView(coordinate: landmarkData[0].locationCoordinate)
+    }
+}
+#endif