1 files changed, 51 insertions, 0 deletions
diff --git a/platform/ios/app/bugcontroller.swift b/platform/ios/app/bugcontroller.swift
new file mode 100644
index 0000000000..85139d9545
--- /dev/null
+++ b/platform/ios/app/bugcontroller.swift
@@ -0,0 +1,51 @@
+// From https://github.com/mapbox/mapbox-gl-native/issues/15342#issue-478458025
+import Foundation
+import Mapbox
+
+class TestMapController: UIViewController, MGLMapViewDelegate {
+    
+    var mapView: MGLMapView!
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        mapView = MGLMapView(frame: view.bounds, styleURL: MGLStyle.lightStyleURL)
+        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+        mapView.tintColor = .darkGray
+        mapView.delegate = self
+        view.addSubview(mapView)
+        
+    }
+    
+    func mapView(_ mapView: MGLMapView, didFinishLoading style: MGLStyle) {
+        let source = MGLShapeSource(identifier: "pictures", features: [], options: nil)
+        let blueBoxImage = TestMapController.singleColoredImage(of: .blue, and: CGSize(width: 50, height: 50))
+        style.setImage(blueBoxImage, forName: "picture")
+        let layer = TestMapController.getLayer(for: source)
+        style.addSource(source)
+        style.addLayer(layer)
+    }
+    
+    static func singleColoredImage(of color: UIColor, and size: CGSize) -> UIImage {
+        let format = UIGraphicsImageRendererFormat()
+        return UIGraphicsImageRenderer(size: size, format: format).image { (context) in
+            color.setFill()
+            context.fill(CGRect(origin: .zero, size: size))
+        }
+    }
+    
+    static func getLayer(for source: MGLShapeSource) -> MGLStyleLayer {
+        let layer = MGLSymbolStyleLayer(identifier: "pictures", source: source)
+        layer.iconAllowsOverlap = NSExpression(forConstantValue: true)
+        layer.minimumZoomLevel = 6.0
+        let nameOfPictures = "picture"
+        let matching = "'\(nameOfPictures)', '\(nameOfPictures)'"
+        let formatImageName = "MGL_MATCH(highlight, \(matching), '\(nameOfPictures)')"
+        let functionImage = NSExpression(format: formatImageName)
+        layer.iconImageName = functionImage
+        layer.keepsIconUpright = NSExpression(forConstantValue: 1)
+        let formatScale = "mgl_interpolate:withCurveType:parameters:stops:($zoomLevel, 'exponential', 1, %@)"
+        layer.iconScale = NSExpression(format: formatScale, [6: 0.3, 11: 0.6, 14: 0.88])
+        return layer
+    }
+}