feat: add AI retouch before-after comparison

suixinkanTests/TravelAlbumDetailViewControllerTests.swift

@@ -637,35 +637,96 @@ final class TravelAlbumDetailViewControllerTests: XCTestCase {
         XCTAssertEqual(cell.accessibilityValue, "未选择")
     }
 
-    func testAIRetouchTemplatePreviewUsesImmersiveZoomableLayout() throws {
-        let template = TravelAlbumAIRetouchTemplate(
-            id: 2,
-            name: "简约留白",
-            previewURL: ""
+    func testBeforeAfterComparisonUsesImmersiveAccessibleLayout() throws {
+        let controller = BeforeAfterComparisonViewController(
+            viewModel: BeforeAfterComparisonViewModel(
+                content: BeforeAfterComparisonContent(
+                    beforeURL: "https://cdn.example.com/before.jpg",
+                    afterURL: "https://cdn.example.com/after.jpg"
+                )
+            )
         )
-        let controller = TravelAlbumAIRetouchTemplatePreviewViewController(template: template)
         controller.loadViewIfNeeded()
         controller.view.frame = CGRect(x: 0, y: 0, width: 390, height: 844)
         controller.view.layoutIfNeeded()
 
-        let scrollView = try XCTUnwrap(
+        let imageContainer = try XCTUnwrap(
             controller.view.findSubview {
-                $0.accessibilityIdentifier == "travelAlbum.aiRetouchTemplatePreviewScrollView"
-            } as? UIScrollView
+                $0.accessibilityIdentifier == "travelAlbum.beforeAfterImageContainer"
+            }
         )
         let backButton = try XCTUnwrap(
             controller.view.findSubview {
-                $0.accessibilityIdentifier == "travelAlbum.aiRetouchTemplatePreviewBackButton"
+                $0.accessibilityIdentifier == "travelAlbum.beforeAfterBackButton"
+            } as? UIButton
+        )
+        let divider = try XCTUnwrap(
+            controller.view.findSubview {
+                $0.accessibilityIdentifier == "travelAlbum.beforeAfterDivider"
+            }
+        )
+
+        XCTAssertEqual(controller.view.backgroundColor, UIColor(hex: 0x05070D))
+        XCTAssertTrue(controller.view.allLabels().contains { $0.text == "原图" })
+        XCTAssertTrue(controller.view.allLabels().contains { $0.text == "效果图" })
+        XCTAssertEqual(imageContainer.layer.cornerRadius, 0)
+        XCTAssertTrue(divider.accessibilityTraits.contains(.adjustable))
+        XCTAssertEqual(divider.accessibilityValue, "原图占比 50%")
+        XCTAssertGreaterThanOrEqual(backButton.bounds.width, 44)
+        XCTAssertGreaterThanOrEqual(backButton.bounds.height, 44)
+    }
+
+    func testPreviewComparisonButtonOnlyShowsForSelectedAIResult() throws {
+        UIView.setAnimationsEnabled(false)
+        defer { UIView.setAnimationsEnabled(true) }
+        let project = TravelAlbumPreviewProject(
+            originalMaterialId: 7,
+            assets: [
+                TravelAlbumPreviewAsset(
+                    id: "original-7",
+                    kind: .original,
+                    fileURL: "https://cdn.example.com/original.jpg",
+                    coverURL: "",
+                    fileName: "原图.jpg",
+                    fileSize: 10
+                ),
+                TravelAlbumPreviewAsset(
+                    id: "retouched-7",
+                    kind: .retouched,
+                    fileURL: "https://cdn.example.com/retouched.jpg",
+                    coverURL: "",
+                    fileName: "精修.jpg",
+                    fileSize: 10
+                ),
+            ]
+        )
+        let controller = TravelAlbumPhotoPreviewViewController(
+            projects: [project],
+            totalCount: 1,
+            startProjectIndex: 0
+        )
+        controller.loadViewIfNeeded()
+        controller.view.frame = CGRect(x: 0, y: 0, width: 390, height: 844)
+        controller.view.layoutIfNeeded()
+        let segmentedControl = try XCTUnwrap(
+            controller.view.findSubview {
+                $0.accessibilityIdentifier == "travelAlbum.previewVariantSegmentedControl"
+            } as? UISegmentedControl
+        )
+        let comparisonButton = try XCTUnwrap(
+            controller.view.findSubview {
+                $0.accessibilityIdentifier == "travelAlbum.previewComparisonButton"
             } as? UIButton
         )
 
-        XCTAssertEqual(controller.view.backgroundColor, .black)
-        XCTAssertTrue(controller.view.allLabels().contains { $0.text == "简约留白" })
-        XCTAssertTrue(controller.view.allLabels().contains { $0.text == "双指缩放查看细节" })
-        XCTAssertEqual(scrollView.minimumZoomScale, 1)
-        XCTAssertEqual(scrollView.maximumZoomScale, 4)
-        XCTAssertGreaterThanOrEqual(backButton.bounds.width, 44)
-        XCTAssertGreaterThanOrEqual(backButton.bounds.height, 44)
+        XCTAssertTrue(comparisonButton.isHidden)
+        segmentedControl.selectedSegmentIndex = 1
+        segmentedControl.sendActions(for: .valueChanged)
+
+        XCTAssertFalse(comparisonButton.isHidden)
+        XCTAssertNil(comparisonButton.configuration?.title)
+        XCTAssertNotNil(comparisonButton.configuration?.image)
+        XCTAssertEqual(comparisonButton.bounds.size, CGSize(width: 48, height: 48))
     }
 
     func testPreviewAIRetouchUsesSelectedRetouchedTabWorkflowAndStaysPresented() async throws {