From 44809628a8107cb0d474e8e58845f8f0d7b434f3 Mon Sep 17 00:00:00 2001
From: Chris Ballinger <chrisballinger@gmail.com>
Date: Sun, 12 Apr 2026 18:16:46 -0400
Subject: [PATCH] Add iOS 26 Liquid Glass navigation bar support

Adapt navigation bars and detail views for the iOS 26 Liquid Glass
translucent chrome. On iOS 26+, nav bars use system transparency
instead of custom opaque appearance theming.

- Appearance: skip custom nav bar background on iOS 26, keep tint color
- DetailHostingController: move nav bar setup to viewWillAppear, enable translucency
- DetailView: hide nav bar background via toolbarBackgroundVisibility for glass effect
- PageViewManager: preserve translucency on iOS 26 instead of forcing opaque

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 iBurn/Appearance.swift                             |  5 +++++
 .../Controllers/DetailHostingController.swift      | 14 +++++++++-----
 iBurn/Detail/Views/DetailView.swift                | 12 ++++++++++++
 iBurn/PageViewManager.swift                        |  6 +++++-
 4 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/iBurn/Appearance.swift b/iBurn/Appearance.swift
index b5fed756..ab103214 100644
--- a/iBurn/Appearance.swift
+++ b/iBurn/Appearance.swift
@@ -190,6 +190,11 @@ extension Appearance {
     }
     
     @objc public static func applyNavigationBarAppearance(_ navBar: UINavigationBar, colors: BRCImageColors, animated: Bool) {
+        if #available(iOS 26, *) {
+            // iOS 26: let system Liquid Glass handle nav bar appearance
+            navBar.tintColor = colors.primaryColor
+            return
+        }
         let appearance = makeNavigationBarAppearance(colors: colors)
         let applyTheme = {
             navBar.standardAppearance = appearance
diff --git a/iBurn/Detail/Controllers/DetailHostingController.swift b/iBurn/Detail/Controllers/DetailHostingController.swift
index e8440605..45c31b81 100644
--- a/iBurn/Detail/Controllers/DetailHostingController.swift
+++ b/iBurn/Detail/Controllers/DetailHostingController.swift
@@ -73,11 +73,13 @@ class DetailHostingController: UIHostingController<DetailView>, DynamicViewContr
     
     override func viewDidLoad() {
         super.viewDidLoad()
-        
-        // Configure navigation bar appearance
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
         setupNavigationBarAppearance()
     }
-    
+
     override func viewWillLayoutSubviews() {
         super.viewWillLayoutSubviews()
         
@@ -107,7 +109,9 @@ class DetailHostingController: UIHostingController<DetailView>, DynamicViewContr
     }
     
     private func setupNavigationBarAppearance() {
-        // This can be customized based on existing app theming
-        // For now, use default appearance
+        if #available(iOS 26, *) {
+            // Transparent nav bar for Liquid Glass effect
+            navigationController?.navigationBar.isTranslucent = true
+        }
     }
 }
diff --git a/iBurn/Detail/Views/DetailView.swift b/iBurn/Detail/Views/DetailView.swift
index d0fa2447..4f5e1fb6 100644
--- a/iBurn/Detail/Views/DetailView.swift
+++ b/iBurn/Detail/Views/DetailView.swift
@@ -55,6 +55,7 @@ struct DetailView: View {
         .background(backgroundColor)
         .navigationBarTitleDisplayMode(.inline)
         .navigationTitle(viewModel.title)
+        .modifier(TransparentNavBarModifier())
         .sheet(isPresented: imageViewerBinding) {
             if let selected = viewModel.selectedImage {
                 ImageViewerSheet(image: selected)
@@ -786,6 +787,17 @@ struct DetailVisitStatusCell: View {
     }
 }
 
+/// Hides the navigation bar background on iOS 26+ for Liquid Glass transparency.
+private struct TransparentNavBarModifier: ViewModifier {
+    func body(content: Content) -> some View {
+        if #available(iOS 26, *) {
+            content.toolbarBackgroundVisibility(.hidden, for: .navigationBar)
+        } else {
+            content
+        }
+    }
+}
+
 struct DetailViewHistoryCell: View {
     let firstViewed: Date?
     let lastViewed: Date?
diff --git a/iBurn/PageViewManager.swift b/iBurn/PageViewManager.swift
index a8c7046e..b88d0188 100644
--- a/iBurn/PageViewManager.swift
+++ b/iBurn/PageViewManager.swift
@@ -45,7 +45,11 @@ import EventKitUI
         
         pageVC.delegate = self
         pageVC.dataSource = self
-        navBar?.isTranslucent = false
+        if #available(iOS 26, *) {
+            // Let iOS 26 Liquid Glass handle nav bar transparency
+        } else {
+            navBar?.isTranslucent = false
+        }
         navBar?.setColorTheme(colors, animated: false)
         pageVC.setViewControllers([detailVC], direction: .forward, animated: false, completion: nil)
         // Navigation item forwarding is now handled automatically by DetailPageViewController