AppCoordinator can open screens now.

1Weather/Coordinators/AppCoordinator.swift

@@ -40,6 +40,30 @@ class AppCoordinator: Coordinator {
         tabBarController.setupTabBar()
     }
     
+    public func openToday() {
+        tabBarController.selectedIndex = AppTabBarController.AppTab.today.rawValue
+    }
+    
+    public func openForecast(timePeriod: TimePeriod?) {
+        let forecastIndex = AppTabBarController.AppTab.forecast.rawValue
+        tabBarController.selectedIndex = forecastIndex
+        if let timePeriod = timePeriod {
+            if let forecastCoordinator = childCoordinators[forecastIndex] as? ForecastCoordinator {
+                forecastCoordinator.open(timePeriod: timePeriod)
+            }
+        }
+    }
+    
+    public func openRadar() {
+        tabBarController.selectedIndex = AppTabBarController.AppTab.radar.rawValue
+    }
+    
+    public func openNotifications() {
+        let notificationsCoordinator = NotificationsCoordinator(parentViewController: tabBarController)
+        notificationsCoordinator.parentCoordinator = self
+        notificationsCoordinator.start()
+    }
+    
     func viewControllerDidEnd(controller: UIViewController) {
         //
     }

1Weather/Coordinators/ForecastCoordinator.swift

@@ -12,6 +12,7 @@ class ForecastCoordinator: Coordinator {
     private let forecastViewModel = ForecastViewModel(locationManager: LocationManager.shared)
     private let navigationController = UINavigationController(nibName: nil, bundle: nil)
     private var tabBarController:UITabBarController?
+    private var forecastViewController: ForecastViewController?
     
     //Public
     var childCoordinators = [Coordinator]()
@@ -25,6 +26,11 @@ class ForecastCoordinator: Coordinator {
         let forecastViewController = ForecastViewController(viewModel: forecastViewModel)
         navigationController.viewControllers = [forecastViewController]
         tabBarController?.add(viewController: navigationController)
+        self.forecastViewController = forecastViewController
+    }
+    
+    public func open(timePeriod: TimePeriod) {
+        self.forecastViewController?.switchTo(timePeriod: timePeriod)
     }
     
     func viewControllerDidEnd(controller: UIViewController) {

1Weather/UI/View controllers/AppTabBarController.swift

@@ -7,16 +7,17 @@
 
 import UIKit
 
-private enum AppTab:Int, CaseIterable {
-    case today = 0
-    case forecast = 1
-    case radar = 2
-    case menu = 3
-}
+
 class AppTabBarController: UITabBarController {
     override func viewDidLoad() {
         super.viewDidLoad()
-
+    }
+    
+    public enum AppTab:Int, CaseIterable {
+        case today = 0
+        case forecast = 1
+        case radar = 2
+        case menu = 3
     }
     
     public func setupTabBar() {

1Weather/UI/View controllers/Forecast/ForecastViewController.swift

@@ -67,13 +67,19 @@ class ForecastViewController: UIViewController {
         }
     }
     
+    public func switchTo(timePeriod: TimePeriod) {
+        if self.timePeriodControl.selectedSegmentIndex != timePeriod.rawValue {
+            self.timePeriodControl.selectedSegmentIndex = timePeriod.rawValue
+        }
+        forecastCellFactory.setTimePeriod(timePeriod: timePeriod)
+        self.tableView.reloadData()
+    }
+    
     @objc private func handleSegmentDidChange() {
         guard let timePeriod = TimePeriod(rawValue: self.timePeriodControl.selectedSegmentIndex) else {
             return
         }
-        
-        forecastCellFactory.setTimePeriod(timePeriod: timePeriod)
-        self.tableView.reloadData()
+        self.switchTo(timePeriod: timePeriod)
     }
     
     @objc private func handleCityButton() {