[WIP] Preview descriptor

Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
   name: "UIPreview",
   platforms: [
-    .iOS(.v11)
+    .iOS(.v13)
   ],
   products: [
     // Products define the executables and libraries a package produces, and make them visible to other packages.

Sources/UIPreview/Binding+Mock.swift

@@ -1,7 +1,6 @@
 #if canImport(SwiftUI)
 import SwiftUI
 #endif
-import UIKit
 
 @available(iOS 13, *)
 extension Binding {

Sources/UIPreview/Preview.swift

@@ -0,0 +1,23 @@
+#if canImport(SwiftUI)
+import SwiftUI
+#endif
+import UIKit
+
+extension UICatalog {
+  public struct Preview {
+    init(_ view: AnyView, title: String) {
+      self.title = title
+      self.view = view
+    }
+
+    public func asViewController() -> UIViewController {
+      ScrollView(.vertical, showsIndicators: true) {
+        view
+      }.navigationBarTitle(title)
+      .asViewController()
+    }
+
+    let title: String
+    let view: AnyView
+  }
+}

Sources/UIPreview/PreviewConfiguration.swift

@@ -0,0 +1,28 @@
+#if canImport(SwiftUI)
+import SwiftUI
+#endif
+import UIKit
+
+extension UICatalog {
+  public struct PreviewConfiguration {
+    public init(themes: [Theme] = Theme.allCases) {
+      self.themes = themes
+    }
+
+    let themes: [Theme]
+  }
+
+  public enum Theme: CaseIterable {
+    case light, dark
+  }
+}
+
+@available(iOS 13, *)
+extension UICatalog.Theme {
+  var scheme: ColorScheme {
+    switch self {
+    case .light: return .light
+    case .dark: return .dark
+    }
+  }
+}

Sources/UIPreview/PreviewDescriptor.swift

@@ -0,0 +1,35 @@
+#if canImport(SwiftUI)
+import SwiftUI
+#endif
+import UIKit
+
+extension UICatalog {
+
+  public struct PreviewDescriptor: Identifiable, Hashable {
+    let view: AnyView
+    public let id: String
+    public let title: String
+    public var preview: Preview { Preview(view, title: title) }
+
+    public func hash(into hasher: inout Hasher) {
+      hasher.combine(id)
+    }
+
+    public static func == (lhs: PreviewDescriptor, rhs: PreviewDescriptor) -> Bool {
+      lhs.id == rhs.id
+    }
+  }
+  
+}
+
+public extension UICatalog.PreviewDescriptor {
+  init<Content>(_ content: Content.Type,
+                configuration: UICatalog.PreviewConfiguration = .init(),
+                title: String? = nil) where Content: UIViewCatalogPresentable {
+    id = "\(content)"
+    self.title = title ?? "\(content)"
+    //    self.view = CatalogPage<Content>(schemes: themes.map(\.scheme))
+
+    self.view = AnyView(Text("sdf"))
+  }
+}

Sources/UIPreview/UICatalog.swift

@@ -1,29 +1 @@
-#if canImport(SwiftUI)
-import SwiftUI
-#endif
-import UIKit
-
-public enum UICatalog {
-  public enum Theme {
-    case light, dark
-  }
-
-  public static func makePreviewPage<Content>(_ content: Content.Type,
-                                              themes: [Theme] = [.light, .dark]
-  ) -> UIViewController where Content: UIViewCatalogPresentable {
-    guard #available(iOS 13, *) else {
-      return UIViewController()
-    }
-    return CatalogPage<Content>(schemes: themes.map(\.scheme)).asViewController()
-  }
-}
-
-@available(iOS 13, *)
-extension UICatalog.Theme {
-  var scheme: ColorScheme {
-    switch self {
-    case .light: return .light
-    case .dark: return .dark
-    }
-  }
-}
+public enum UICatalog {}