1 files changed, 71 insertions, 0 deletions
diff --git a/platform/ios/demo/Examples/ObjectiveC/SelectFeatureExample.m b/platform/ios/demo/Examples/ObjectiveC/SelectFeatureExample.m
new file mode 100644
index 0000000000..c3f5dd971d
--- /dev/null
+++ b/platform/ios/demo/Examples/ObjectiveC/SelectFeatureExample.m
@@ -0,0 +1,71 @@
+#import "SelectFeatureExample.h"
+@import Mapbox;
+
+NSString *const MBXExampleSelectFeature = @"SelectFeatureExample";
+
+@interface SelectFeatureExample () <MGLMapViewDelegate>
+@property (nonatomic) MGLMapView *mapView;
+@property (nonatomic) MGLShapeSource *selectedFeaturesSource;
+@end
+
+@implementation SelectFeatureExample
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+
+    MGLMapView *mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds];
+
+    mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+
+    [mapView setCenterCoordinate:CLLocationCoordinate2DMake(45.5076, -122.6736)
+                       zoomLevel:11
+                        animated:NO];
+
+    // Add our own gesture recognizer to handle taps on our custom map features
+    [mapView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didTapMap:)]];
+
+    mapView.delegate = self;
+
+    [self.view addSubview:mapView];
+
+    self.mapView = mapView;
+}
+
+- (void)mapView:(MGLMapView *)mapView didFinishLoadingStyle:(MGLStyle *)style {
+    // Create a placeholder MGLShapeSource that will hold copies of any features we’ve selected.
+    MGLShapeSource *source = [[MGLShapeSource alloc] initWithIdentifier:@"selected-features" features:@[] options:nil];
+    [style addSource:source];
+
+    // Keep a reference to the source so we can update it when the map is tapped.
+    self.selectedFeaturesSource = source;
+
+    // Color any selected features red on the map.
+    MGLFillStyleLayer *selectedFeaturesLayer = [[MGLFillStyleLayer alloc] initWithIdentifier:@"selected-features" source:source];
+    selectedFeaturesLayer.fillColor = [MGLStyleValue valueWithRawValue:[UIColor redColor]];
+
+    [style addLayer:selectedFeaturesLayer];
+}
+
+- (void)didTapMap:(UITapGestureRecognizer *)recognizer {
+    if (recognizer.state == UIGestureRecognizerStateEnded) {
+        // A tap’s center coordinate may not intersect a feature exactly, so let’s make a 44x44 rect that represents a touch and select all features that interesect.
+        CGRect pointRect = { [recognizer locationInView:recognizer.view], CGSizeZero };
+        CGRect touchRect = CGRectInset(pointRect, -22.0, -22.0);
+
+        // Let’s only select parks near the rect. There’s a layer within the Mapbox Streets style with "id" = "park". You can see all of the layers used within the default mapbox styles by creating a new style using Mapbox Studio.
+        NSSet *layerIdentifiers = [NSSet setWithObject:@"park"];
+
+        // Query the current mapview for any features that intersect our rect.
+        NSMutableArray *features = [NSMutableArray array];
+        for (id f in [self.mapView visibleFeaturesInRect:touchRect inStyleLayersWithIdentifiers:layerIdentifiers]) {
+            [features addObject:f];
+        }
+
+        MGLShapeCollectionFeature *shapes = [MGLShapeCollectionFeature shapeCollectionWithShapes:features];
+
+        // Update our MGLShapeSource to match our selected features.
+        self.selectedFeaturesSource.shape = shapes;
+    }
+}
+
+@end