implement isInitialized and isMounted

ARKit.js

@@ -159,13 +159,12 @@ Object.keys(ARKitManager).forEach(key => {
   ARKit[key] = ARKitManager[key];
 });
 
-const addDefaultsToSnapShotFunc = funcName => ({
-  target = 'cameraRoll',
-  format = 'png'
-} = {}) => ARKitManager[funcName]({ target, format });
+const addDefaultsToSnapShotFunc = funcName => (
+  { target = 'cameraRoll', format = 'png' } = {},
+) => ARKitManager[funcName]({ target, format });
 
-ARKit.snapshot = addDefaultsToSnapShotFunc("snapshot");
-ARKit.snapshotCamera = addDefaultsToSnapShotFunc("snapshotCamera");
+ARKit.snapshot = addDefaultsToSnapShotFunc('snapshot');
+ARKit.snapshotCamera = addDefaultsToSnapShotFunc('snapshotCamera');
 
 ARKit.exportModel = presetId => {
   const id = presetId || generateId();
@@ -197,6 +196,8 @@ ARKit.propTypes = {
   onTapOnPlaneUsingExtent: PropTypes.func,
   onTapOnPlaneNoExtent: PropTypes.func,
   onEvent: PropTypes.func,
+  isMounted: PropTypes.func,
+  isInitialized: PropTypes.func,
 };
 
 const RCTARKit = requireNativeComponent('RCTARKit', ARKit);

ios/RCTARKit.h

@@ -21,6 +21,7 @@ typedef void (^RCTARKitReject)(NSString *code, NSString *message, NSError *error
 @interface RCTARKit : UIView
 
 + (instancetype)sharedInstance;
++ (bool)isInitialized;
 - (instancetype)initWithARView:(ARSCNView *)arView;
 
 
@@ -72,8 +73,7 @@ typedef void (^RCTARKitReject)(NSString *code, NSString *message, NSError *error
 - (NSDictionary *)readCamera;
 - (NSDictionary* )getCurrentLightEstimation;
 - (NSArray * )getCurrentDetectedFeaturePoints;
-
-
+- (bool)isMounted;
 
 #pragma mark - Delegates
 - (void)renderer:(id <SCNSceneRenderer>)renderer didRenderScene:(SCNScene *)scene atTime:(NSTimeInterval)time;

ios/RCTARKit.m

@@ -36,9 +36,14 @@ void dispatch_once_on_main_thread(dispatch_once_t *predicate,
 
 
 @implementation RCTARKit
+static RCTARKit *instance = nil;
+
++ (bool)isInitialized {
+    return instance !=nil;
+}
 
 + (instancetype)sharedInstance {
-    static RCTARKit *instance = nil;
+
     static dispatch_once_t onceToken;
 
     dispatch_once_on_main_thread(&onceToken, ^{
@@ -47,9 +52,15 @@ + (instancetype)sharedInstance {
             instance = [[self alloc] initWithARView:arView];
         }
     });
+
     return instance;
 }
 
+- (bool)isMounted {
+
+    return self.superview != nil;
+}
+
 - (instancetype)initWithARView:(ARSCNView *)arView {
     if ((self = [super init])) {
         self.arView = arView;
@@ -85,6 +96,8 @@ - (instancetype)initWithARView:(ARSCNView *)arView {
     return self;
 }
 
+
+
 - (void)layoutSubviews {
     [super layoutSubviews];
     //NSLog(@"setting view bounds %@", NSStringFromCGRect(self.bounds));

ios/RCTARKitManager.m

@@ -139,6 +139,19 @@ - (NSDictionary *)constantsToExport
     resolve(@{});
 }
 
+RCT_EXPORT_METHOD(isInitialized:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject) {
+   resolve(@([ARKit isInitialized]));
+}
+
+RCT_EXPORT_METHOD(isMounted:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject) {
+    if( [ARKit isInitialized]) {
+        dispatch_async(dispatch_get_main_queue(), ^{
+            resolve(@([[ARKit sharedInstance] isMounted]));
+        });
+    } else {
+        resolve(@(NO));
+    }
+}
 
 RCT_EXPORT_METHOD(
                   hitTestPlanes: (NSDictionary *)pointDict

startup.js

@@ -6,5 +6,10 @@ export default () => {
   // when reloading the app, the scene should be cleared.
   // on prod, this usually does not happen, but you can reload the app in develop mode
   // without clearing, this would result in inconsistency
-  ARKitManager.clearScene();
+  ARKitManager.isInitialized().then(isInitialized => {
+    console.log('was already initialized on startup', isInitialized);
+    if (isInitialized) {
+      ARKitManager.clearScene();
+    }
+  });
 };