added reset functionality (resets tracking and removes existing anchors)

Author: Victor Cordos

ios/RCTARKit.h

@@ -53,6 +53,7 @@ typedef void (^RCTARKitReject)(NSString *code, NSString *message, NSError *error
 #pragma mark - Public Method
 - (void)pause;
 - (void)resume;
+- (void)reset;
 - (void)hitTestPlane:(CGPoint)tapPoint types:(ARHitTestResultType)types resolve:(RCTARKitResolve)resolve reject:(RCTARKitReject)reject;
 - (void)hitTestSceneObjects:(CGPoint)tapPoint resolve:(RCTARKitResolve) resolve reject:(RCTARKitReject)reject;
 - (SCNVector3)projectPoint:(SCNVector3)point;

ios/RCTARKit.m

@@ -98,6 +98,12 @@ - (void)resume {
     [self.session runWithConfiguration:self.configuration];
 }
 
+- (void)reset {
+    if (ARWorldTrackingConfiguration.isSupported) {
+        [self.session runWithConfiguration:self.configuration options:ARSessionRunOptionRemoveExistingAnchors | ARSessionRunOptionResetTracking];
+    }
+}
+
 - (void)focusScene {
     [self.nodeManager.localOrigin setPosition:self.nodeManager.cameraOrigin.position];
     [self.nodeManager.localOrigin setRotation:self.nodeManager.cameraOrigin.rotation];

ios/RCTARKitManager.m

@@ -77,6 +77,11 @@ - (NSDictionary *)constantsToExport
     resolve(@{});
 }
 
+RCT_EXPORT_METHOD(reset:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject) {
+    [[ARKit sharedInstance] reset];
+    resolve(@{});
+}
+
 
 RCT_EXPORT_METHOD(
                   hitTestPlanes: (NSDictionary *)pointDict