message: Implemented custom view children of bar button
diff: @@ -116,6 +116,17 @@ using namespace facebook::react;
  #pragma mark - RCTComponentViewProtocol
  +- (void)mountChildComponentView:(UIView<RCTComponentViewProtocol> *)childComponentView index:(NSInteger)index
  +{
  + [self.button setCustomView:childComponentView];
  +}
  +
  +- (void)unmountChildComponentView:(UIView<RCTComponentViewProtocol> *)childComponentView index:(NSInteger)index
  +{
  + if (self.button.customView == childComponentView)
  + [self.button setCustomView:nil];
  +}
  +
  + (ComponentDescriptorProvider)componentDescriptorProvider
  {
  return concreteComponentDescriptorProvider<NVBarButtonComponentDescriptor>();
  