Tab Bar: Adds tab bar view/view controller

App/Tabs/TabBarViewController.swift

@@ -0,0 +1,74 @@
+//
+//  TabBarViewController.swift
+//  App
+//
+//  Created by James Magahern on 10/28/20.
+//
+
+import Combine
+import UIKit
+
+class TabBarViewController: UIViewController, TabBarViewDataSource, TabBarViewDelegate
+{
+    let tabBarView = TabBarView()
+    
+    private var tabController: TabController
+    
+    private var tabObserver: AnyCancellable?
+    private var activeTabIndexObserver: AnyCancellable?
+    
+    override func loadView() {
+        self.view = tabBarView
+    }
+    
+    init(tabController: TabController) {
+        self.tabController = tabController
+        super.init(nibName: nil, bundle: nil)
+        
+        tabBarView.dataSource = self
+        tabBarView.delegate = self
+        tabBarView.reloadTabs()
+        
+        tabObserver = tabController.$tabs.sink(receiveValue: { [tabBarView] (newTabs: [Tab]) in
+            DispatchQueue.main.async { tabBarView.reloadTabs() }
+        })
+        
+        activeTabIndexObserver = tabController.$activeTabIndex.sink(receiveValue: { [tabBarView] (activeIndex: Int) in
+            tabBarView.activateTab(atIndex: activeIndex)
+        })
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    // MARK: TabBarViewDelegate
+    func tabBarView(_ tabBarView: TabBarView, didClickToActivateTabAtIndex index: Int) {
+        tabController.activeTabIndex = index
+    }
+    
+    func tabBarView(_ tabBarView: TabBarView, didClickToCloseTabAtIndex index: Int) {
+        let tab = tabController.tabs[index]
+        tabController.closeTab(tab)
+    }
+    
+    // MARK: TabBarViewDataSource
+    func numberOfTabs(forTabBarView: TabBarView) -> Int {
+        return tabController.tabs.count
+    }
+    
+    func tabBarView(_ tabBarView: TabBarView, titleForTabAtIndex index: Int) -> String {
+        let defaultTitle = "New Tab"
+        
+        if let title = tabController.tabs[index].title, title.count > 0 {
+            return title
+        }
+        
+        return defaultTitle
+    }
+    
+    func tabBarView(_ tabBarView: TabBarView, imageForTabAtIndex index: Int) -> UIImage? {
+        tabController.tabs[index].favicon
+    }
+    
+}