Load progress indicator

SBrowser/Browser View/BrowserViewController.swift

@@ -19,6 +19,8 @@ class BrowserViewController: UIViewController,
     private var blockedScriptOrigins = Set<String>()
     override var canBecomeFirstResponder: Bool { true }
     
+    private var loadingObservation: NSKeyValueObservation?
+    
     init() {
         super.init(nibName: nil, bundle: nil)
     }
@@ -53,6 +55,11 @@ class BrowserViewController: UIViewController,
         // TextField delegate
         toolbarController.urlBar.textField.delegate = self
         
+        // Load progress
+        loadingObservation = webView.observe(\.estimatedProgress) { (webView, observedChange) in
+            self.toolbarController.urlBar.loadProgress = .loading(progress: webView.estimatedProgress)
+        }
+        
         self.view = browserView
     }
     
@@ -94,6 +101,10 @@ class BrowserViewController: UIViewController,
         }
     }
     
+    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
+        toolbarController.urlBar.loadProgress = .complete
+    }
+    
     // MARK: UITextField Delegate
     
     func textFieldShouldReturn(_ textField: UITextField) -> Bool {