[Liquid glass]: Modals

Examples/DemosApp/DemosApp/ComponentsPreview/Helpers/ModalPreview+Helpers.swift

@@ -65,6 +65,7 @@ struct ModalPreviewHelpers {
           Text("Warning Background").tag(UniversalColor.warningBackground)
           Text("Danger Background").tag(UniversalColor.dangerBackground)
         }
+        BackgroundStylePicker(selection: self.$model.backgroundStyle)
         BorderWidthPicker(selection: self.$model.borderWidth)
         Toggle("Closes On Overlay Tap", isOn: self.$model.closesOnOverlayTap)
           .disabled(self.footer == nil)

Examples/DemosApp/DemosApp/ComponentsPreview/Helpers/PreviewPickers.swift

@@ -32,6 +32,22 @@ struct AutocapitalizationPicker: View {
   }
 }
 
+// MARK: - BackgroundStylePicker
+
+struct BackgroundStylePicker: View {
+  @Binding var selection: ComponentsKit.BackgroundStyle
+
+  var body: some View {
+    Picker("Background Style", selection: self.$selection) {
+      Text("Solid").tag(ComponentsKit.BackgroundStyle.solid)
+      Text("Blur").tag(ComponentsKit.BackgroundStyle.blur)
+      if #available(iOS 26.0, *) {
+        Text("Liquid Glass").tag(ComponentsKit.BackgroundStyle.liquidGlass)
+      }
+    }
+  }
+}
+
 // MARK: - BorderWidthPicker
 
 struct BorderWidthPicker: View {

Examples/DemosApp/DemosApp/ComponentsPreview/PreviewPages/AlertPreview.swift

@@ -89,6 +89,7 @@ struct AlertPreview: View {
             Text("Warning Background").tag(UniversalColor.warningBackground)
             Text("Danger Background").tag(UniversalColor.dangerBackground)
           }
+          BackgroundStylePicker(selection: self.$model.backgroundStyle)
           BorderWidthPicker(selection: self.$model.borderWidth)
           Toggle("Closes On Overlay Tap", isOn: self.$model.closesOnOverlayTap)
           Picker("Content Paddings", selection: self.$model.contentPaddings) {

Sources/ComponentsKit/Components/Alert/Models/AlertVM.swift

@@ -21,6 +21,9 @@ public struct AlertVM: ComponentVM {
   /// The background color of the alert.
   public var backgroundColor: UniversalColor?
 
+  /// Defines how the alert renders its background.
+  public var backgroundStyle: BackgroundStyle = .solid
+
   /// The border thickness of the alert.
   ///
   /// Defaults to `.small`.
@@ -61,6 +64,7 @@ extension AlertVM {
   var modalVM: CenterModalVM {
     return CenterModalVM {
       $0.backgroundColor = self.backgroundColor
+      $0.backgroundStyle = self.backgroundStyle
       $0.borderWidth = self.borderWidth
       $0.closesOnOverlayTap = self.closesOnOverlayTap
       $0.contentPaddings = self.contentPaddings

Sources/ComponentsKit/Components/Modal/Models/BottomModalVM.swift

@@ -5,6 +5,9 @@ public struct BottomModalVM: ModalVM {
   /// The background color of the modal.
   public var backgroundColor: UniversalColor?
 
+  /// Defines how modal renders its background.
+  public var backgroundStyle: BackgroundStyle = .solid
+
   /// The border thickness of the modal.
   ///
   /// Defaults to `.small`.

Sources/ComponentsKit/Components/Modal/Models/CenterModalVM.swift

@@ -5,6 +5,9 @@ public struct CenterModalVM: ModalVM {
   /// The background color of the modal.
   public var backgroundColor: UniversalColor?
 
+  /// Defines how modal renders its background.
+  public var backgroundStyle: BackgroundStyle = .solid
+
   /// The border thickness of the modal.
   ///
   /// Defaults to `.small`.

Sources/ComponentsKit/Components/Modal/Models/ModalVM.swift

@@ -5,6 +5,9 @@ public protocol ModalVM: ComponentVM {
   /// The background color of the modal.
   var backgroundColor: UniversalColor? { get set }
 
+  /// Defines how modal renders its background.
+  var backgroundStyle: BackgroundStyle { get set }
+
   /// The border thickness of the modal.
   var borderWidth: BorderWidth { get set }
 
@@ -36,10 +39,15 @@ public protocol ModalVM: ComponentVM {
 // MARK: - Helpers
 
 extension ModalVM {
-  var preferredBackgroundColor: UniversalColor {
-    return self.backgroundColor ?? .themed(
-      light: UniversalColor.background.light,
-      dark: UniversalColor.secondaryBackground.dark
-    )
+  var preferredBackgroundColor: UniversalColor? {
+    switch self.backgroundStyle {
+    case .solid:
+      return self.backgroundColor ?? .themed(
+        light: UniversalColor.background.light,
+        dark: UniversalColor.secondaryBackground.dark
+      )
+    case .liquidGlass, .blur:
+      return self.backgroundColor
+    }
   }
 }

Sources/ComponentsKit/Components/Modal/SwiftUI/ModalContent.swift

@@ -55,11 +55,9 @@ struct ModalContent<VM: ModalVM, Header: View, Body: View, Footer: View>: View {
         .padding(.bottom, self.model.contentPaddings.bottom)
     }
     .frame(maxWidth: self.model.size.maxWidth, alignment: .leading)
-    .background(self.model.preferredBackgroundColor.color)
-    .clipShape(RoundedRectangle(cornerRadius: self.model.cornerRadius.value))
-    .overlay(
-      RoundedRectangle(cornerRadius: self.model.cornerRadius.value)
-        .strokeBorder(UniversalColor.divider.color, lineWidth: self.model.borderWidth.value)
+    .modalBackground(
+      shape: RoundedRectangle(cornerRadius: model.cornerRadius.value),
+      model: self.model
     )
     .padding(self.model.outerPaddings.edgeInsets)
   }
@@ -74,3 +72,43 @@ struct ModalContent<VM: ModalVM, Header: View, Body: View, Footer: View>: View {
     return self.bodySize.height + self.bodyTopPadding + self.bodyBottomPadding
   }
 }
+
+extension View {
+  @ViewBuilder
+  fileprivate func modalBackground<BackgroundShape: InsettableShape>(
+    shape: BackgroundShape,
+    model: any ModalVM
+  ) -> some View {
+    switch model.backgroundStyle {
+    case .solid:
+      self.background(model.preferredBackgroundColor?.color)
+        .clipShape(shape)
+        .overlay(
+          shape
+            .strokeBorder(UniversalColor.divider.color, lineWidth: model.borderWidth.value)
+        )
+    case .blur:
+      self
+        .background {
+          shape
+            .fill(.thinMaterial)
+            .overlay {
+              shape.strokeBorder(UniversalColor.divider.color, lineWidth: model.borderWidth.value)
+            }
+        }
+        .background(model.preferredBackgroundColor?.color)
+        .clipShape(shape)
+    case .liquidGlass:
+      if #available(iOS 26.0, *) {
+        self.glassEffect(
+          .regular
+            .tint(model.preferredBackgroundColor?.color)
+            .interactive(),
+          in: shape
+        )
+      } else {
+        self
+      }
+    }
+  }
+}

Sources/ComponentsKit/Components/Modal/SwiftUI/ModalOverlay.swift

@@ -17,7 +17,7 @@ struct ModalOverlay<VM: ModalVM>: View {
     Group {
       switch self.model.overlayStyle {
       case .dimmed:
-        Color.black.opacity(0.7)
+        Color.black.opacity(0.35)
       case .blurred:
         Color.clear.background(.ultraThinMaterial)
       case .transparent:

Sources/ComponentsKit/Components/Modal/UIKit/UKModalController.swift

@@ -27,6 +27,8 @@ open class UKModalController<VM: ModalVM>: UIViewController {
   public var footer: UIView?
   /// The content view, holding the header, body, and footer.
   public let contentView = UIView()
+  /// The visual effect container used to render blur and liquid glass modal backgrounds.
+  public let backgroundEffectView = UIVisualEffectView()
   /// A scrollable wrapper for the body content.
   public let bodyWrapper: UIScrollView = ContentSizedScrollView()
   /// The overlay view that appears behind the modal.
@@ -76,12 +78,13 @@ open class UKModalController<VM: ModalVM>: UIViewController {
   open func setup() {
     self.view.addSubview(self.overlay)
     self.view.addSubview(self.contentView)
+    self.contentView.addSubview(self.backgroundEffectView)
     if let header {
-      self.contentView.addSubview(header)
+      self.backgroundEffectView.contentView.addSubview(header)
     }
-    self.contentView.addSubview(self.bodyWrapper)
+    self.backgroundEffectView.contentView.addSubview(self.bodyWrapper)
     if let footer {
-      self.contentView.addSubview(footer)
+      self.backgroundEffectView.contentView.addSubview(footer)
     }
 
     self.bodyWrapper.addSubview(self.body)
@@ -141,6 +144,7 @@ open class UKModalController<VM: ModalVM>: UIViewController {
   open func style() {
     Self.Style.overlay(self.overlay, model: self.model)
     Self.Style.contentView(self.contentView, model: self.model)
+    Self.Style.backgroundEffectView(self.backgroundEffectView, model: self.model)
     Self.Style.bodyWrapper(self.bodyWrapper)
   }
 
@@ -149,6 +153,7 @@ open class UKModalController<VM: ModalVM>: UIViewController {
   /// Configures the layout of the modal's subviews.
   open func layout() {
     self.overlay.allEdges()
+    self.backgroundEffectView.allEdges()
 
     if let header {
       header.top(self.model.contentPaddings.top)
@@ -242,6 +247,7 @@ open class UKModalController<VM: ModalVM>: UIViewController {
 
   @objc private func handleTraitChanges() {
     Self.Style.contentView(self.contentView, model: self.model)
+    Self.Style.backgroundEffectView(self.backgroundEffectView, model: self.model)
   }
 }
 
@@ -252,18 +258,39 @@ extension UKModalController {
     static func overlay(_ view: UIView, model: VM) {
       switch model.overlayStyle {
       case .dimmed:
-        view.backgroundColor = .black.withAlphaComponent(0.7)
+        view.backgroundColor = .black.withAlphaComponent(0.35)
       case .transparent:
         view.backgroundColor = .clear
       case .blurred:
         (view as? UIVisualEffectView)?.effect = UIBlurEffect(style: .systemUltraThinMaterial)
       }
     }
     static func contentView(_ view: UIView, model: VM) {
-      view.backgroundColor = model.preferredBackgroundColor.uiColor
+      view.layer.cornerRadius = model.cornerRadius.value
+    }
+    static func backgroundEffectView(_ view: UIVisualEffectView, model: VM) {
       view.layer.cornerRadius = model.cornerRadius.value
       view.layer.borderColor = UniversalColor.divider.cgColor
       view.layer.borderWidth = model.borderWidth.value
+      view.clipsToBounds = true
+
+      switch model.backgroundStyle {
+      case .solid:
+        view.effect = nil
+        view.backgroundColor = model.preferredBackgroundColor?.uiColor
+      case .blur:
+        view.effect = UIBlurEffect(style: .systemThinMaterial)
+        view.backgroundColor = model.preferredBackgroundColor?.uiColor
+      case .liquidGlass:
+        if #available(iOS 26.0, *) {
+          let effect = UIGlassEffect(style: .regular)
+          effect.tintColor = model.preferredBackgroundColor?.uiColor
+          effect.isInteractive = true
+          view.effect = effect
+        } else {
+          view.effect = nil
+        }
+      }
     }
     static func bodyWrapper(_ scrollView: UIScrollView) {
       scrollView.delaysContentTouches = false

Sources/ComponentsKit/Shared/Types/BackgroundStyle.swift

@@ -0,0 +1,11 @@
+import Foundation
+
+/// Defines how a component renders its background.
+public enum BackgroundStyle {
+  /// A regular filled background using the component's configured background color.
+  case solid
+  /// A system liquid glass effect that lets underlying content show through the component.
+  @available(iOS 26.0, *) case liquidGlass
+  /// A system blur material that softens content behind the component.
+  case blur
+}