1 files changed, 79 insertions, 0 deletions
diff --git a/platform/ios/demo/Examples/Swift/DrawingAGeoJSONLineExample.swift b/platform/ios/demo/Examples/Swift/DrawingAGeoJSONLineExample.swift
new file mode 100644
index 0000000000..3b132186f5
--- /dev/null
+++ b/platform/ios/demo/Examples/Swift/DrawingAGeoJSONLineExample.swift
@@ -0,0 +1,79 @@
+import Mapbox
+
+@objc(DrawingAGeoJSONLineExample_Swift)
+
+class DrawingAGeoJSONLineExample_Swift: UIViewController, MGLMapViewDelegate {
+    var mapView: MGLMapView!
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        mapView = MGLMapView(frame: view.bounds)
+        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+        
+        mapView.setCenter(CLLocationCoordinate2D(latitude: 45.5076, longitude: -122.6736),
+                          zoomLevel: 11, animated: false)
+        view.addSubview(self.mapView)
+        
+        mapView.delegate = self
+        
+        drawPolyline()
+    }
+    
+    func drawPolyline() {
+        // Parsing GeoJSON can be CPU intensive, do it on a background thread
+        
+        DispatchQueue.global(qos: .background).async(execute: {
+            // Get the path for example.geojson in the app's bundle
+            let jsonPath = Bundle.main.path(forResource: "example", ofType: "geojson")
+            let url = URL(fileURLWithPath: jsonPath!)
+            
+            do {
+                // Convert the file contents to a shape collection feature object
+                let data = try Data(contentsOf: url)
+                let shapeCollectionFeature = try MGLShape(data: data, encoding: String.Encoding.utf8.rawValue) as! MGLShapeCollectionFeature
+                
+                if let polyline = shapeCollectionFeature.shapes.first as? MGLPolylineFeature {
+                    // Optionally set the title of the polyline, which can be used for:
+                    //  - Callout view
+                    //  - Object identification
+                    polyline.title = polyline.attributes["name"] as? String
+                    
+                    // Add the annotation on the main thread
+                    DispatchQueue.main.async(execute: {
+                        // Unowned reference to self to prevent retain cycle
+                        [unowned self] in
+                        self.mapView.addAnnotation(polyline)
+                    })
+                }
+            }
+            catch {
+                print("GeoJSON parsing failed")
+            }
+            
+        })
+        
+    }
+    
+    func mapView(_ mapView: MGLMapView, alphaForShapeAnnotation annotation: MGLShape) -> CGFloat {
+        // Set the alpha for all shape annotations to 1 (full opacity)
+        return 1
+    }
+    
+    func mapView(_ mapView: MGLMapView, lineWidthForPolylineAnnotation annotation: MGLPolyline) -> CGFloat {
+        // Set the line width for polyline annotations
+        return 2.0
+    }
+    
+    func mapView(_ mapView: MGLMapView, strokeColorForShapeAnnotation annotation: MGLShape) -> UIColor {
+        // Give our polyline a unique color by checking for its `title` property
+        if (annotation.title == "Crema to Council Crest" && annotation is MGLPolyline) {
+            // Mapbox cyan
+            return UIColor(red: 59/255, green:178/255, blue:208/255, alpha:1)
+        }
+        else
+        {
+            return .red
+        }
+    }
+}