1 files changed, 64 insertions, 0 deletions
diff --git a/platform/ios/demo/Examples/ObjectiveC/BlockingGesturesDelegateExample.m b/platform/ios/demo/Examples/ObjectiveC/BlockingGesturesDelegateExample.m
new file mode 100644
index 0000000000..2ac90fdc67
--- /dev/null
+++ b/platform/ios/demo/Examples/ObjectiveC/BlockingGesturesDelegateExample.m
@@ -0,0 +1,64 @@
+#import "BlockingGesturesDelegateExample.h"
+@import Mapbox;
+
+NSString *const MBXExampleBlockingGesturesDelegate = @"BlockingGesturesDelegateExample";
+
+@interface BlockingGesturesDelegateExample () <MGLMapViewDelegate>
+@property (nonatomic) MGLCoordinateBounds colorado;
+@end
+
+@implementation BlockingGesturesDelegateExample
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    
+    MGLMapView *mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds];
+    mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+    mapView.delegate = self;
+    mapView.styleURL = [MGLStyle outdoorsStyleURLWithVersion:9];
+    
+    // Denver, Colorado
+    CLLocationCoordinate2D center = CLLocationCoordinate2DMake(39.748947, -104.995882);
+    
+    // Starting point
+    [mapView setCenterCoordinate:center zoomLevel:10 direction:0 animated:NO];
+    
+    // Colorado's bounds
+    CLLocationCoordinate2D ne = CLLocationCoordinate2DMake(40.989329, -102.062592);
+    CLLocationCoordinate2D sw = CLLocationCoordinate2DMake(36.986207, -109.049896);
+    self.colorado = MGLCoordinateBoundsMake(sw, ne);
+    
+    [self.view addSubview:mapView];
+}
+
+// This example uses Colorado's boundaries to restrict
+// the camera movement.
+
+- (BOOL)mapView:(MGLMapView *)mapView shouldChangeFromCamera:(MGLMapCamera *)oldCamera toCamera:(MGLMapCamera *)newCamera
+{
+    // Get the current camera to restore it after
+    MGLMapCamera *currentCamera = mapView.camera;
+    
+    // From the new camera obtain the center to test
+    // if it's inside the boundaries
+    CLLocationCoordinate2D newCameraCenter = newCamera.centerCoordinate;
+    
+    
+    // Set mapView to newCamera to project the
+    // new boundaries
+    mapView.camera = newCamera;
+    MGLCoordinateBounds newVisibleCoordinates = mapView.visibleCoordinateBounds;
+    
+    // Revert the camera
+    mapView.camera = currentCamera;
+    
+    // Test if the newCameraCenter and newVisibleCoordinates
+    // are inside self.colorado
+    BOOL inside = MGLCoordinateInCoordinateBounds(newCameraCenter, self.colorado);
+    BOOL intersects = MGLCoordinateInCoordinateBounds(newVisibleCoordinates.ne, self.colorado) && MGLCoordinateInCoordinateBounds(newVisibleCoordinates.sw, self.colorado);
+    
+    return inside && intersects;
+
+}
+
+@end