SoompiBlog - AppCoordinator+Perform.swift

@discardableResult func perform(_ navigation: Navigation) -> Bool {
  guard let navigationController = currentNavigationController() else { return false }

  // Check first if we can perform the navigation.
  let currentNavigation = (navigationController.visibleViewController as? NavigationSource)?.sourceNavigation
  let nextNavigation = navigation.redirectIfNeeded(from: currentNavigation)

  switch nextNavigation {
  case .tab(let tabType):
    for viewController in tabBarController.viewControllers ?? [] {
      if let tabTypeProvidable = viewController as? TabTypeProvidable, tabTypeProvidable.tabType == tabType {
        tabBarController.selectedViewController = viewController
      }
    }
  case .post(let id, let partialPost, let fetcher):
    let viewController = ArticleViewController(appCoordinator: self, id: id, partialPost: partialPost, fetcher: fetcher)
    navigationController.pushViewController(viewController, animated: true)
  case .feed(let parameter):
    let viewController = FeedViewController(appCoordinator: self,
                                            loader: apiClient.getFeed(parameter:),
                                            parameter: parameter,
                                            sourceNavigation: navigation)
    navigationController.pushViewController(viewController, animated: true)
  case .search:
    let viewController = SearchViewController(appCoordinator: self)
    navigationController.pushViewController(viewController, animated: true)
  case .safari(let url):
    let viewController = SFSafariViewController(url: url)
    navigationController.present(viewController, animated: true, completion: nil)
  case .applicationOpen(let url):
    UIApplication.shared.open(url, options: [:], completionHandler: nil)
  //...
  }
}