iOS: Assorted tweaks

BrowserCore/BrowserView.swift

@@ -28,18 +28,21 @@ public struct BrowserView: View {
     
     @ViewBuilder
     private var mainView: some View {
-        switch state {
-        case .loading:
-            loadingView
-                .onAppear(perform: self.loadDocument)
-        case let .error(message):
-            VStack {
+        VStack {
+            switch state {
+            case .loading:
+                Spacer()
+                loadingView
+                    .onAppear(perform: self.loadDocument)
+                Spacer()
+            case let .error(message):
                 Text("An error occurred")
                     .font(.headline)
                 Text(message)
+            case let .document(doc):
+                DocumentView(document: doc, scrollingEnabled: scrollingEnabled, changeURL: navigator.changeURL)
+                Spacer()
             }
-        case let .document(doc):
-            DocumentView(document: doc, scrollingEnabled: scrollingEnabled, changeURL: navigator.changeURL)
         }
     }
     
@@ -79,7 +82,12 @@ public struct BrowserView: View {
     }
     
     private func urlChanged(_ newValue: URL) {
-        state = .loading
+        if case .loading = state {
+            task?.cancel()
+            loadDocument()
+        } else {
+            state = .loading
+        }
     }
 }
 

Gemini-iOS/BrowserViewController.swift

@@ -8,6 +8,7 @@
 import UIKit
 import SwiftUI
 import BrowserCore
+import Combine
 
 class BrowserViewController: UIViewController, UIScrollViewDelegate {
     
@@ -23,6 +24,8 @@ class BrowserViewController: UIViewController, UIScrollViewDelegate {
     
     private var barAnimator: UIViewPropertyAnimator?
     
+    private var cancellables = [AnyCancellable]()
+    
     init(navigator: NavigationManager) {
         self.navigator = navigator
         
@@ -40,6 +43,7 @@ class BrowserViewController: UIViewController, UIScrollViewDelegate {
         
         scrollView = UIScrollView()
         scrollView.translatesAutoresizingMaskIntoConstraints = false
+        scrollView.keyboardDismissMode = .interactive
         view.addSubview(scrollView)
         scrollView.delegate = self
         NSLayoutConstraint.activate([
@@ -62,7 +66,7 @@ class BrowserViewController: UIViewController, UIScrollViewDelegate {
             browserHost.view.widthAnchor.constraint(equalTo: view.widthAnchor),
             
             // make sure the browser host view is at least the screen height so the loading indicator appears centered
-            browserHost.view.heightAnchor.constraint(greaterThanOrEqualTo: view.safeAreaLayoutGuide.heightAnchor),
+            browserHost.view.heightAnchor.constraint(greaterThanOrEqualTo: view.heightAnchor),
         ])
         
         navBarHost = UIHostingController(rootView: NavigationBar(navigator: navigator))
@@ -90,6 +94,14 @@ class BrowserViewController: UIViewController, UIScrollViewDelegate {
             toolBarHost.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
             toolBarHost.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
         ])
+        
+        navigator.$currentURL
+            .sink { (_) in
+                self.scrollView.contentOffset = .zero
+                self.navBarHost.view.transform = .identity
+                self.toolBarHost.view.transform = .identity
+            }
+            .store(in: &cancellables)
     }
     
     override func viewDidLayoutSubviews() {
@@ -116,7 +128,9 @@ class BrowserViewController: UIViewController, UIScrollViewDelegate {
         
         // When certain state changes happen, the scroll view seems to "scroll" by top the safe area inset.
         // It's not actually user scrolling, and this screws up our animation, so we ignore it.
-        guard abs(scrollViewDelta) != view.safeAreaInsets.top, scrollViewDelta != 0 else { return }
+        guard abs(scrollViewDelta) != view.safeAreaInsets.top,
+              scrollViewDelta != 0,
+              scrollView.contentOffset.y > 0 else { return }
         
         let barAnimator: UIViewPropertyAnimator
         if let animator = self.barAnimator {

Gemini-iOS/NavigationBar.swift

@@ -33,6 +33,9 @@ struct NavigationBar: View {
                 .foregroundColor(Color(white: colorScheme == .dark ? 0.25 : 0.75))
         }
         .background(Color(UIColor.systemBackground).edgesIgnoringSafeArea(.top))
+        .onReceive(navigator.$currentURL) { (newURL) in
+            urlFieldContents = newURL.absoluteString
+        }
     }
     
     private func commitURL() {

Gemini-iOS/ToolBar.swift

@@ -66,6 +66,8 @@ struct ToolBar: View {
                 
                 Spacer()
             }
+            
+            Spacer(minLength: 4)
         }
         .background(Color(UIColor.systemBackground).edgesIgnoringSafeArea(.bottom))
         .sheet(isPresented: $showPreferencesSheet, content: {