message: cleanup NVNavigationBarView
diff: }
  }
  --(void)layoutSubviews
  -{
  - [super layoutSubviews];
  +- (void)updateStyle {
  + UINavigationBar *navigationBar;
  if (self.reactViewController == self.reactViewController.navigationController.topViewController) {
  - UINavigationBar *navigationBar = self.reactViewController.navigationController.navigationBar;
  + navigationBar = self.reactViewController.navigationController.navigationBar;
  for (UIView *view in [navigationBar subviews]) {
  if ([view isKindOfClass:NSClassFromString(@"_UINavigationBarContentView")]) {
  for (UIView *child in [view subviews]) {
  }
  }
  }
  -}
  -
  -- (void)updateStyle {
  - UINavigationBar *navigationBar;
  - if (self.reactViewController == self.reactViewController.navigationController.topViewController) {
  - navigationBar = self.reactViewController.navigationController.navigationBar;
  - }
  if (@available(iOS 13.0, *)) {
  [navigationBar setTintColor: self.tintColor];
  UINavigationBarAppearance *appearance = [UINavigationBarAppearance new];
  