Host a public-API native glass surface behind the app tab bar

ios/Runner.xcodeproj/project.pbxproj

@@ -37,7 +37,7 @@
 		9A4F20EC31E1000100000001 /* ApplePCCBridge.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9A4F20EB31E1000100000001 /* ApplePCCBridge.swift */; };
 		A17D0FF131E1000100000001 /* HandoffBridge.swift in Sources */ = {isa = PBXBuildFile; fileRef = A17D0FF031E1000100000001 /* HandoffBridge.swift */; };
 		A685F7A8DE8A8339A7CFE48A /* RunnerUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = F8FADD48E0FE94429FDE1912 /* RunnerUITests.swift */; };
-		AC39B11031E1000100000001 /* NativeBottomTabBar.swift in Sources */ = {isa = PBXBuildFile; fileRef = AC39B11131E1000100000001 /* NativeBottomTabBar.swift */; };
+		AC39B11231E1000100000001 /* NativeGlassSurface.swift in Sources */ = {isa = PBXBuildFile; fileRef = AC39B11331E1000100000001 /* NativeGlassSurface.swift */; };
 		B005C7BA5D2714CB149B4B95 /* MithkaBlue.icon in Resources */ = {isa = PBXBuildFile; fileRef = 0CC7151EAA772074B2F1F159 /* MithkaBlue.icon */; };
 		B45E6836D8D2D05AB2676E08 /* NotificationService.swift in Sources */ = {isa = PBXBuildFile; fileRef = DB5790DB6BBC8220D67CE86B /* NotificationService.swift */; };
 		BD06D3B4F53874C98C6D9618 /* tdjson.xcframework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 7AF24ACBEB1466595B72E2DD /* tdjson.xcframework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
@@ -136,7 +136,7 @@
 		9AE1F80607B45379F5468F27 /* Pods-Runner.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.debug.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"; sourceTree = "<group>"; };
 		A17D0FF031E1000100000001 /* HandoffBridge.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = HandoffBridge.swift; path = ../../apple/HandoffBridge.swift; sourceTree = "<group>"; };
 		A257B729519AB240FBD5E29F /* MithkaPurple.icon */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = folder.iconcomposer.icon; path = MithkaPurple.icon; sourceTree = "<group>"; };
-		AC39B11131E1000100000001 /* NativeBottomTabBar.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NativeBottomTabBar.swift; sourceTree = "<group>"; };
+		AC39B11331E1000100000001 /* NativeGlassSurface.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NativeGlassSurface.swift; sourceTree = "<group>"; };
 		B02F5C04823E6F1B8B4DC318 /* NotificationCommunicationContent.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = NotificationCommunicationContent.swift; sourceTree = "<group>"; };
 		C145FCC43A8CB4B5D827E2D6 /* MithkaPixel.icon */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = folder.iconcomposer.icon; path = MithkaPixel.icon; sourceTree = "<group>"; };
 		D20D61E8E4A929586A940D51 /* NotificationService.entitlements */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.plist.entitlements; path = NotificationService.entitlements; sourceTree = "<group>"; };
@@ -273,7 +273,7 @@
 				9A4F20F131E1000100000001 /* NowPlayingBridge.swift */,
 				9A4F20E931E1000100000001 /* CommunicationNotificationBridge.swift */,
 				9A4F20EB31E1000100000001 /* ApplePCCBridge.swift */,
-				AC39B11131E1000100000001 /* NativeBottomTabBar.swift */,
+				AC39B11331E1000100000001 /* NativeGlassSurface.swift */,
 				A17D0FF031E1000100000001 /* HandoffBridge.swift */,
 				7884E8672EC3CC0400C636F2 /* SceneDelegate.swift */,
 				74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */,
@@ -700,7 +700,7 @@
 				9A4F20F231E1000100000001 /* NowPlayingBridge.swift in Sources */,
 				9A4F20EA31E1000100000001 /* CommunicationNotificationBridge.swift in Sources */,
 				9A4F20EC31E1000100000001 /* ApplePCCBridge.swift in Sources */,
-				AC39B11031E1000100000001 /* NativeBottomTabBar.swift in Sources */,
+				AC39B11231E1000100000001 /* NativeGlassSurface.swift in Sources */,
 				A17D0FF131E1000100000001 /* HandoffBridge.swift in Sources */,
 				1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */,
 				7884E8682EC3CC0700C636F2 /* SceneDelegate.swift in Sources */,

ios/Runner/AppDelegate.swift

@@ -172,8 +172,8 @@ import UserNotifications
     guard !didRegisterFlutterPlugins else { return }
     didRegisterFlutterPlugins = true
     GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
-    if let registrar = engineBridge.pluginRegistry.registrar(forPlugin: "NativeBottomTabBar") {
-      registrar.register(NativeBottomTabBarFactory(registrar: registrar), withId: "mithka/native_bottom_bar")
+    if let registrar = engineBridge.pluginRegistry.registrar(forPlugin: "NativeGlassSurface") {
+      registrar.register(NativeGlassSurfaceFactory(registrar: registrar), withId: "mithka/native_glass")
     }
     let windowGeometryChannel = FlutterMethodChannel(
       name: "mithka/window_geometry",

ios/Runner/NativeGlassSurface.swift

@@ -0,0 +1,115 @@
+import Flutter
+import UIKit
+
+/// A glass-surface-only platform view behind the app-owned tab row:
+///
+/// - On iOS 26+ the glass is the public `UIGlassEffect(style: .regular)` inside
+///   a `UIVisualEffectView`, styled with `overrideUserInterfaceStyle` and
+///   `tintColor` from the active theme.
+/// - Before iOS 26 it uses a system material `UIBlurEffect`.
+/// - The view draws no tabs, icons, or badges, and disables user interaction so
+///   every tap lands on the Flutter tab controls above it.
+@MainActor
+final class NativeGlassSurfaceFactory: NSObject, FlutterPlatformViewFactory {
+  private let registrar: FlutterPluginRegistrar
+
+  init(registrar: FlutterPluginRegistrar) {
+    self.registrar = registrar
+    super.init()
+  }
+
+  func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
+    FlutterStandardMessageCodec.sharedInstance()
+  }
+
+  func create(
+    withFrame frame: CGRect,
+    viewIdentifier viewId: Int64,
+    arguments args: Any?
+  ) -> FlutterPlatformView {
+    NativeGlassSurface(frame: frame, id: viewId, registrar: registrar, arguments: args)
+  }
+}
+
+@MainActor
+private final class NativeGlassSurface: NSObject, FlutterPlatformView {
+  private let host: GlassSurfaceHost
+  private let channel: FlutterMethodChannel
+
+  init(frame: CGRect, id: Int64, registrar: FlutterPluginRegistrar, arguments: Any?) {
+    host = GlassSurfaceHost(frame: frame)
+    channel = FlutterMethodChannel(
+      name: "mithka/native_glass/\(id)", binaryMessenger: registrar.messenger()
+    )
+    super.init()
+    if let configuration = arguments as? [String: Any] { host.apply(configuration) }
+    channel.setMethodCallHandler { [weak self] call, result in
+      guard let self, call.method == "update",
+        let configuration = call.arguments as? [String: Any]
+      else {
+        result(FlutterMethodNotImplemented)
+        return
+      }
+      self.host.apply(configuration)
+      result(nil)
+    }
+  }
+
+  func view() -> UIView { host }
+
+  deinit { channel.setMethodCallHandler(nil) }
+}
+
+@MainActor
+private final class GlassSurfaceHost: UIView {
+  private let effectView = UIVisualEffectView(effect: nil)
+
+  override init(frame: CGRect) {
+    super.init(frame: frame)
+    backgroundColor = .clear
+    isOpaque = false
+    isUserInteractionEnabled = false
+    effectView.isUserInteractionEnabled = false
+    effectView.layer.masksToBounds = true
+    addSubview(effectView)
+  }
+
+  required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
+
+  func apply(_ configuration: [String: Any]) {
+    let dark = configuration["dark"] as? Bool == true
+    overrideUserInterfaceStyle = dark ? .dark : .light
+    effectView.overrideUserInterfaceStyle = dark ? .dark : .light
+    let cornerRadius = (configuration["radius"] as? NSNumber)?.doubleValue ?? 0
+    effectView.layer.cornerRadius = cornerRadius
+
+    if #available(iOS 26.0, *) {
+      var tint: UIColor?
+      if let argb = configuration["tint"] as? NSNumber {
+        let value = argb.uint32Value
+        tint = UIColor(
+          red: CGFloat((value >> 16) & 255) / 255,
+          green: CGFloat((value >> 8) & 255) / 255,
+          blue: CGFloat(value & 255) / 255,
+          alpha: CGFloat((value >> 24) & 255) / 255
+        )
+      }
+      if let current = effectView.effect as? UIGlassEffect {
+        if current.tintColor != tint { current.tintColor = tint }
+      } else {
+        let glass = UIGlassEffect(style: .regular)
+        glass.tintColor = tint
+        glass.isInteractive = false
+        effectView.effect = glass
+      }
+    } else {
+      let desiredStyle: UIBlurEffect.Style = dark ? .systemMaterialDark : .systemMaterialLight
+      effectView.effect = UIBlurEffect(style: desiredStyle)
+    }
+  }
+
+  override func layoutSubviews() {
+    super.layoutSubviews()
+    effectView.frame = bounds
+  }
+}