From 04a0c64482c045bd622a8d1c4ad6ca1baace2c34 Mon Sep 17 00:00:00 2001
From: jmkiley <jordan.kiley@mapbox.com>
Date: Tue, 13 Jun 2017 15:21:50 -0700
Subject: [ios] added demo project

---
 .../Swift/RuntimeCircleStylesExample.swift         | 69 ++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 platform/ios/demo/Examples/Swift/RuntimeCircleStylesExample.swift

(limited to 'platform/ios/demo/Examples/Swift/RuntimeCircleStylesExample.swift')

diff --git a/platform/ios/demo/Examples/Swift/RuntimeCircleStylesExample.swift b/platform/ios/demo/Examples/Swift/RuntimeCircleStylesExample.swift
new file mode 100644
index 0000000000..14dc2a81f9
--- /dev/null
+++ b/platform/ios/demo/Examples/Swift/RuntimeCircleStylesExample.swift
@@ -0,0 +1,69 @@
+import Mapbox
+
+@objc(RuntimeCircleStylesExample_Swift)
+
+class RuntimeCircleStylesExample_Swift: UIViewController, MGLMapViewDelegate {
+    var mapView: MGLMapView!
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        mapView = MGLMapView(frame: view.bounds)
+        mapView.styleURL = MGLStyle.lightStyleURL(withVersion: 9)
+        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+        mapView.tintColor = .darkGray
+
+        mapView.setCenter(
+            CLLocationCoordinate2D(latitude: 37.753574, longitude: -122.447303),
+            zoomLevel: 10,
+            animated: false)
+        view.addSubview(mapView)
+        
+        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: "population", configurationURL: URL(string: "mapbox://examples.8fgz4egr")!)
+
+        let ethnicities = [
+            "White": UIColor(red: 251/255.0, green: 176/255.0, blue: 59/255.0, alpha: 1.0),
+            "Black": UIColor(red: 34/255.0, green: 59/255.0, blue: 83/255.0, alpha: 1.0),
+            "Hispanic": UIColor(red: 229/255.0, green: 94/255.0, blue: 94/255.0, alpha: 1.0),
+            "Asian": UIColor(red: 59/255.0, green: 178/255.0, blue: 208/255.0, alpha: 1.0),
+            "Other": UIColor(red: 204/255.0, green: 204/255.0, blue: 204/255.0, alpha: 1.0),
+        ]
+
+        style.addSource(source)
+
+        // Create a new layer for each ethnicity/circle color.
+        for (ethnicity, color) in ethnicities {
+            // Each layer should have a unique identifier.
+            let layer = MGLCircleStyleLayer(identifier: "population-\(ethnicity)", source: source)
+
+            // Specifying the `sourceLayerIdentifier` is required for a vector tile source. This is the json attribute that wraps the data in the source.
+            layer.sourceLayerIdentifier = "sf2010"
+
+            // Use a style function to smoothly adjust the circle radius from 2pt to 180pt between zoom levels 12 and 22. The `interpolationBase` parameter allows the values to interpolate along an exponential curve.
+            layer.circleRadius = MGLStyleValue(interpolationMode: .exponential,
+                cameraStops: [12: MGLStyleValue(rawValue: 2),
+                              22: MGLStyleValue(rawValue: 180)],
+                options: [.defaultValue : 1.75])
+            
+//            (interpolationBase: 1.75, stops: )
+            layer.circleOpacity = MGLStyleValue(rawValue: 0.7)
+
+            // Set the circle color to match the ethnicity.
+            layer.circleColor = MGLStyleValue(rawValue: color)
+            
+            // Use an NSPredicate to filter to just one ethnicity for this layer.
+            layer.predicate = NSPredicate(format: "ethnicity == %@", ethnicity)
+            
+            style.addLayer(layer)
+        }
+    }
+}
-- 
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