1 files changed, 80 insertions, 0 deletions
diff --git a/platform/ios/demo/Examples/Swift/RuntimeToggleLayerExample.swift b/platform/ios/demo/Examples/Swift/RuntimeToggleLayerExample.swift
new file mode 100644
index 0000000000..d6b6776f2a
--- /dev/null
+++ b/platform/ios/demo/Examples/Swift/RuntimeToggleLayerExample.swift
@@ -0,0 +1,80 @@
+import Mapbox
+
+@objc(RuntimeToggleLayerExample_Swift)
+
+class RuntimeToggleLayerExample_Swift: UIViewController, MGLMapViewDelegate {
+    var mapView: MGLMapView!
+    var contoursLayer: MGLStyleLayer?
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        mapView = MGLMapView(frame: view.bounds)
+        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+        
+        mapView.setCenter(CLLocationCoordinate2D(latitude: 37.745395, longitude: -119.594421), zoomLevel: 11, animated: false)
+        view.addSubview(mapView)
+        
+        addToggleButton()
+        
+        mapView.delegate = self
+    }
+    
+    // Wait until the style is loaded before modifying the map style
+    func mapView(_ mapView: MGLMapView, didFinishLoading style: MGLStyle) {
+        addLayer(to: style)
+    }
+    
+    func addLayer(to style: MGLStyle) {
+        let source = MGLVectorSource(identifier: "contours", configurationURL: NSURL(string: "mapbox://mapbox.mapbox-terrain-v2")! as URL)
+        
+        let layer = MGLLineStyleLayer(identifier: "contours", source: source)
+        layer.sourceLayerIdentifier = "contour"
+        layer.lineJoin = MGLStyleValue(rawValue: NSValue(mglLineJoin: .round))
+        layer.lineCap = MGLStyleValue(rawValue: NSValue(mglLineCap: .round))
+        layer.lineColor = MGLStyleValue(rawValue: UIColor.brown)
+        layer.lineWidth = MGLStyleValue(rawValue: 1.0)
+        
+        style.addSource(source)
+        if let water = style.layer(withIdentifier: "water") {
+            // You can insert a layer below an existing style layer
+            style.insertLayer(layer, below: water)
+        } else {
+            // or you can simply add it above all layers
+            style.addLayer(layer)
+        }
+        
+        self.contoursLayer = layer
+        
+        showContours()
+    }
+    
+    func toggleLayer(sender: UIButton) {
+        sender.isSelected = !sender.isSelected
+        if sender.isSelected {
+            showContours()
+        } else {
+            hideContours()
+        }
+    }
+    
+    func showContours() {
+        self.contoursLayer?.isVisible = true
+    }
+    
+    func hideContours() {
+        self.contoursLayer?.isVisible = false
+    }
+    
+    func addToggleButton() {
+        let button = UIButton(type: .system)
+        button.autoresizingMask = [.flexibleTopMargin, .flexibleLeftMargin, .flexibleRightMargin]
+        button.setTitle("Toggle Contours", for: .normal)
+        button.isSelected = true
+        button.sizeToFit()
+        button.center.x = self.view.center.x
+        button.frame = CGRect(origin: CGPoint(x: button.frame.origin.x, y: self.view.frame.size.height - button.frame.size.height - 5), size: button.frame.size)
+        button.addTarget(self, action: #selector(RuntimeToggleLayerExample_Swift.toggleLayer(sender:)), for: .touchUpInside)
+        self.view.addSubview(button)
+    }
+}