1 files changed, 64 insertions, 0 deletions
diff --git a/platform/ios/demo/Examples/ObjectiveC/PointConversionExample.m b/platform/ios/demo/Examples/ObjectiveC/PointConversionExample.m
new file mode 100644
index 0000000000..a5156e64fc
--- /dev/null
+++ b/platform/ios/demo/Examples/ObjectiveC/PointConversionExample.m
@@ -0,0 +1,64 @@
+#import "PointConversionExample.h"
+@import Mapbox;
+
+NSString *const MBXExamplePointConversion = @"PointConversionExample";
+
+@interface PointConversionExample ()
+@property (nonatomic) MGLMapView *mapView;
+@end
+
+@implementation PointConversionExample
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+
+    self.mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds];
+    self.mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+
+    [self.view addSubview:self.mapView];
+
+    // Double tapping zooms the map, so ensure that can still happen.
+    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:nil];
+    doubleTap.numberOfTapsRequired = 2;
+    [self.mapView addGestureRecognizer:doubleTap];
+
+    // Delay single tap recognition until it is clearly not a double.
+    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
+    [singleTap requireGestureRecognizerToFail:doubleTap];
+    [self.mapView addGestureRecognizer:singleTap];
+
+    // Convert `mapView.centerCoordinate` (CLLocationCoordinate2D)
+    // to screen location (CGPoint).
+    CGPoint centerScreenPoint = [self.mapView convertCoordinate:self.mapView.centerCoordinate
+                                                  toPointToView:self.mapView];
+
+    NSLog(@"Screen center: %@ = %@",
+          NSStringFromCGPoint(centerScreenPoint),
+          NSStringFromCGPoint(self.mapView.center));
+}
+
+- (void)handleSingleTap:(UITapGestureRecognizer *)tap {
+    // Convert tap location (CGPoint)
+    // to geographic coordinates (CLLocationCoordinate2D).
+    CLLocationCoordinate2D location = [self.mapView convertPoint:[tap locationInView:self.mapView]
+                                            toCoordinateFromView:self.mapView];
+
+    NSLog(@"You tapped at: %.5f, %.5f", location.latitude, location.longitude);
+
+    // Create an array of coordinates for our polyline.
+    CLLocationCoordinate2D coordinates[] = {
+        self.mapView.centerCoordinate,
+        location
+    };
+    NSUInteger numberOfCoordinates = sizeof(coordinates) / sizeof(CLLocationCoordinate2D);
+
+    // Remove existing polyline from the map, (re)add polyline with coordinates.
+    if (self.mapView.annotations.count) {
+        [self.mapView removeAnnotations:self.mapView.annotations];
+    }
+    MGLPolyline *polyline = [MGLPolyline polylineWithCoordinates:coordinates
+                                                           count:numberOfCoordinates];
+    [self.mapView addAnnotation:polyline];
+}
+
+@end