Fix home navigation bar visibility and hide scan tab title.

Home uses a custom top bar, so TabNavigationController now syncs system nav bar visibility with the stack top; remove the scan tab text label to show icon only.

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkan_ios/App/App.md

@@ -112,4 +112,6 @@ Toast 展示为顶部全宽横幅，背景使用不透明主色并延伸到屏
 
 Tab 根页面显示底部 TabBar。通过 `AppRoute` push 到子页面时，会根据 `AppRoute.hidesTabBarWhenPushed` 统一隐藏 TabBar。
 
+首页根页面使用自定义顶部栏，因此 `TabNavigationController` 会在展示 `HomeViewController` 时隐藏系统导航栏；push 到其他业务子页面或从子页面返回时，由导航栈统一按栈顶页面恢复系统导航栏显隐，避免首页隐藏状态影响子页面标题栏和返回按钮。
+
 跨 Tab、推送通知、UI Test 直达和全局扫码都通过 `AppNavigator` 处理。`AppNavigationPolicy.currentStack` 沿当前栈 push，`.tabRoot` 切到目标 Tab 并先回到 root，`.preserveTab` 只切换 Tab 并保留原栈。新增页面时优先扩展 `AppRoute` / `HomeRoute` / `ProfileRoute` / `OrdersRoute`，并在 `AppRouteViewControllerFactory` 注册对应 ViewController。

suixinkan_ios/App/Navigation/TabNavigationController.swift

@@ -17,6 +17,7 @@ final class TabNavigationController: UINavigationController {
         self.appTab = tab
         self.services = services
         super.init(nibName: nil, bundle: nil)
+        delegate = self
         navigationBar.prefersLargeTitles = false
         setViewControllers([tab.makeRootViewController(services: services)], animated: false)
     }
@@ -32,4 +33,66 @@ final class TabNavigationController: UINavigationController {
         viewController.hidesBottomBarWhenPushed = route.hidesTabBarWhenPushed
         pushViewController(viewController, animated: animated)
     }
+
+    /// Push 页面时按目标页同步系统导航栏状态，覆盖各页面直接调用系统 push 的场景。
+    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
+        updateNavigationBarVisibility(for: viewController, animated: animated)
+        super.pushViewController(viewController, animated: animated)
+    }
+
+    /// 设置导航栈时按最终栈顶同步系统导航栏状态。
+    override func setViewControllers(_ viewControllers: [UIViewController], animated: Bool) {
+        if let topViewController = viewControllers.last {
+            updateNavigationBarVisibility(for: topViewController, animated: animated)
+        }
+        super.setViewControllers(viewControllers, animated: animated)
+    }
+
+    /// 弹出页面后按新的栈顶同步系统导航栏状态。
+    override func popViewController(animated: Bool) -> UIViewController? {
+        let poppedViewController = super.popViewController(animated: animated)
+        if !animated, let topViewController {
+            updateNavigationBarVisibility(for: topViewController, animated: false)
+        }
+        return poppedViewController
+    }
+
+    /// 回到根页面后按根页面同步系统导航栏状态。
+    override func popToRootViewController(animated: Bool) -> [UIViewController]? {
+        let poppedViewControllers = super.popToRootViewController(animated: animated)
+        if !animated, let topViewController {
+            updateNavigationBarVisibility(for: topViewController, animated: false)
+        }
+        return poppedViewControllers
+    }
+
+    /// 弹到指定页面后按该页面同步系统导航栏状态。
+    override func popToViewController(_ viewController: UIViewController, animated: Bool) -> [UIViewController]? {
+        let poppedViewControllers = super.popToViewController(viewController, animated: animated)
+        if !animated, let topViewController {
+            updateNavigationBarVisibility(for: topViewController, animated: false)
+        }
+        return poppedViewControllers
+    }
+
+    /// 根据页面类型判断系统导航栏是否应隐藏。
+    private func shouldHideNavigationBar(for viewController: UIViewController) -> Bool {
+        viewController is HomeViewController
+    }
+
+    /// 将系统导航栏显示状态同步到目标页面，避免首页隐藏状态泄漏到子页面。
+    private func updateNavigationBarVisibility(for viewController: UIViewController, animated: Bool) {
+        setNavigationBarHidden(shouldHideNavigationBar(for: viewController), animated: animated)
+    }
+}
+
+extension TabNavigationController: UINavigationControllerDelegate {
+    /// 导航转场即将展示页面时更新系统导航栏显隐状态。
+    func navigationController(
+        _ navigationController: UINavigationController,
+        willShow viewController: UIViewController,
+        animated: Bool
+    ) {
+        updateNavigationBarVisibility(for: viewController, animated: animated)
+    }
 }