message: Called willNavigate event on appearing
diff: }
  }
  +-(void)viewWillAppear:(BOOL)animated
  +{
  + [super viewWillAppear:animated];
  + if (self.navigationModule && self.navigationModule.bridge) {
  + [self.navigationModule sendEventWithName:@"WillNavigate" body:@{@"crumb": @(self.crumb), @"tab": @(self.tab)}];
  + }
  +}
  +
  - (void)loadView
  {
  NVApplicationHostDelegate *delegate = (NVApplicationHostDelegate *)[[UIApplication sharedApplication] delegate];
  