feat(ios-qa): adaptive XCUITest runner that reaches nested controls and verifies taps

JSON-driven XCUITest runner plus SwiftUI/UIKit fixture apps that drive a
real app by bundle id. The runner resolves the actual switch inside a
SwiftUI Toggle wrapper, and when a center tap misses the full-width row it
retries on the control's trailing edge via an element-anchored normalized
offset (adaptive, not a raw screen coordinate), then verifies the switch
value actually changed. A tap that silently does nothing is now reported
as an interaction failure, not a false product defect. Validated on the
simulator and on a physical iPhone.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

test/fixtures/ios-qa/FixtureApp/Sources/AdaptiveSwiftUIFixture/AdaptiveSwiftUIFixtureApp.swift

@@ -0,0 +1,79 @@
+import SwiftUI
+
+@main
+struct AdaptiveSwiftUIFixtureApp: App {
+    var body: some Scene { WindowGroup { GalleryView() } }
+}
+
+private struct GalleryView: View {
+    @State private var count = 0
+    @State private var query = ""
+    @State private var showingSheet = false
+    @State private var showingAlert = false
+
+    var body: some View {
+        NavigationStack {
+            List {
+                Section("Actions") {
+                    Button("Increment") { count += 1 }
+                        .accessibilityIdentifier("swiftui.increment")
+                    Text("Count: \(count)")
+                        .accessibilityIdentifier("swiftui.count")
+                    Button("Unavailable") {}
+                        .disabled(true)
+                        .accessibilityIdentifier("swiftui.disabled")
+                    Button("Show sheet") { showingSheet = true }
+                        .accessibilityIdentifier("swiftui.sheet.open")
+                    Button("Show alert") { showingAlert = true }
+                        .accessibilityIdentifier("swiftui.alert.open")
+                }
+
+                Section("Input") {
+                    TextField("Search terms", text: $query)
+                        .textInputAutocapitalization(.never)
+                        .accessibilityIdentifier("swiftui.search")
+                    Text("Echo: \(query)")
+                        .accessibilityIdentifier("swiftui.echo")
+                }
+
+                Section("Nested horizontal scroll") {
+                    ScrollView(.horizontal) {
+                        HStack {
+                            ForEach(0..<12) { index in
+                                Button("Card \(index)") {}
+                                    .buttonStyle(.bordered)
+                                    .accessibilityIdentifier("swiftui.card.\(index)")
+                            }
+                        }
+                    }
+                    .accessibilityIdentifier("swiftui.horizontal-scroll")
+                }
+
+                Section("Long vertical list") {
+                    ForEach(0..<35) { index in
+                        NavigationLink("Row \(index)") {
+                            Text("Detail \(index)")
+                                .accessibilityIdentifier("swiftui.detail.\(index)")
+                        }
+                        .accessibilityIdentifier("swiftui.row.\(index)")
+                    }
+                }
+            }
+            .accessibilityIdentifier("swiftui.list")
+            .navigationTitle("SwiftUI Gallery")
+            .sheet(isPresented: $showingSheet) {
+                NavigationStack {
+                    Text("Sheet content").accessibilityIdentifier("swiftui.sheet.content")
+                        .toolbar {
+                            Button("Done") { showingSheet = false }
+                                .accessibilityIdentifier("swiftui.sheet.done")
+                        }
+                }
+            }
+            .alert("Confirm action", isPresented: $showingAlert) {
+                Button("Cancel", role: .cancel) {}
+                Button("Confirm") { count += 10 }
+            }
+        }
+    }
+}

test/fixtures/ios-qa/FixtureApp/Sources/AdaptiveSwiftUIFixture/Info.plist

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>SwiftUI QA Gallery</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>UILaunchScreen</key>
+	<dict/>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
+</dict>
+</plist>

test/fixtures/ios-qa/FixtureApp/Sources/AdaptiveUIKitFixture/AdaptiveUIKitFixtureApp.swift

@@ -0,0 +1,85 @@
+import UIKit
+
+@main
+final class AppDelegate: UIResponder, UIApplicationDelegate {
+    var window: UIWindow?
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions options: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
+        let window = UIWindow(frame: UIScreen.main.bounds)
+        window.rootViewController = UINavigationController(rootViewController: UIKitGalleryController())
+        window.makeKeyAndVisible()
+        self.window = window
+        return true
+    }
+}
+
+final class UIKitGalleryController: UIViewController, UITextFieldDelegate {
+    private let stack = UIStackView()
+    private let countLabel = UILabel()
+    private let echoLabel = UILabel()
+    private var count = 0
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        title = "UIKit Gallery"
+        view.backgroundColor = .systemBackground
+
+        let scroll = UIScrollView()
+        scroll.accessibilityIdentifier = "uikit.vertical-scroll"
+        stack.axis = .vertical
+        stack.spacing = 16
+        stack.layoutMargins = UIEdgeInsets(top: 24, left: 20, bottom: 24, right: 20)
+        stack.isLayoutMarginsRelativeArrangement = true
+        view.addSubview(scroll); scroll.addSubview(stack)
+        scroll.translatesAutoresizingMaskIntoConstraints = false
+        stack.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            scroll.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor), scroll.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            scroll.leadingAnchor.constraint(equalTo: view.leadingAnchor), scroll.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            stack.topAnchor.constraint(equalTo: scroll.contentLayoutGuide.topAnchor), stack.bottomAnchor.constraint(equalTo: scroll.contentLayoutGuide.bottomAnchor),
+            stack.leadingAnchor.constraint(equalTo: scroll.frameLayoutGuide.leadingAnchor), stack.trailingAnchor.constraint(equalTo: scroll.frameLayoutGuide.trailingAnchor)
+        ])
+
+        addButton("Increment", id: "uikit.increment", action: #selector(increment))
+        countLabel.text = "Count: 0"; countLabel.accessibilityIdentifier = "uikit.count"; stack.addArrangedSubview(countLabel)
+        let disabled = addButton("Unavailable", id: "uikit.disabled", action: #selector(noop)); disabled.isEnabled = false
+        addButton("Show sheet", id: "uikit.sheet.open", action: #selector(showSheet))
+        addButton("Show alert", id: "uikit.alert.open", action: #selector(showAlert))
+
+        let field = UITextField(); field.placeholder = "Search terms"; field.borderStyle = .roundedRect
+        field.accessibilityIdentifier = "uikit.search"; field.delegate = self; field.addTarget(self, action: #selector(textChanged(_:)), for: .editingChanged)
+        stack.addArrangedSubview(field)
+        echoLabel.text = "Echo: "; echoLabel.accessibilityIdentifier = "uikit.echo"; stack.addArrangedSubview(echoLabel)
+
+        let horizontal = UIScrollView(); horizontal.accessibilityIdentifier = "uikit.horizontal-scroll"
+        let cards = UIStackView(); cards.axis = .horizontal; cards.spacing = 12
+        horizontal.addSubview(cards); cards.translatesAutoresizingMaskIntoConstraints = false; horizontal.heightAnchor.constraint(equalToConstant: 52).isActive = true
+        NSLayoutConstraint.activate([cards.topAnchor.constraint(equalTo: horizontal.contentLayoutGuide.topAnchor), cards.bottomAnchor.constraint(equalTo: horizontal.contentLayoutGuide.bottomAnchor), cards.leadingAnchor.constraint(equalTo: horizontal.contentLayoutGuide.leadingAnchor), cards.trailingAnchor.constraint(equalTo: horizontal.contentLayoutGuide.trailingAnchor), cards.heightAnchor.constraint(equalTo: horizontal.frameLayoutGuide.heightAnchor)])
+        for index in 0..<12 { let button = UIButton(type: .system); button.setTitle("Card \(index)", for: .normal); button.accessibilityIdentifier = "uikit.card.\(index)"; cards.addArrangedSubview(button) }
+        stack.addArrangedSubview(horizontal)
+
+        for index in 0..<35 { addButton("Row \(index)", id: "uikit.row.\(index)", action: #selector(openRow(_:)), tag: index) }
+
+        let occluded = addButton("Occluded target", id: "uikit.occluded", action: #selector(noop))
+        let blocker = UIView(); blocker.backgroundColor = .systemBackground; blocker.accessibilityIdentifier = "uikit.occluder"; blocker.isAccessibilityElement = true
+        occluded.addSubview(blocker); blocker.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([blocker.topAnchor.constraint(equalTo: occluded.topAnchor), blocker.bottomAnchor.constraint(equalTo: occluded.bottomAnchor), blocker.leadingAnchor.constraint(equalTo: occluded.leadingAnchor), blocker.trailingAnchor.constraint(equalTo: occluded.trailingAnchor)])
+    }
+
+    @discardableResult private func addButton(_ title: String, id: String, action: Selector, tag: Int = 0) -> UIButton {
+        let button = UIButton(type: .system); button.configuration = .bordered(); button.setTitle(title, for: .normal); button.accessibilityIdentifier = id; button.tag = tag
+        button.addTarget(self, action: action, for: .touchUpInside); stack.addArrangedSubview(button); return button
+    }
+    @objc private func increment() { count += 1; countLabel.text = "Count: \(count)" }
+    @objc private func noop() {}
+    @objc private func textChanged(_ sender: UITextField) { echoLabel.text = "Echo: \(sender.text ?? "")" }
+    @objc private func openRow(_ sender: UIButton) { navigationController?.pushViewController(DetailController(index: sender.tag), animated: true) }
+    @objc private func showSheet() { let vc = UIViewController(); vc.view.backgroundColor = .systemBackground; vc.view.accessibilityIdentifier = "uikit.sheet.content"; vc.title = "Sheet content"; let nav = UINavigationController(rootViewController: vc); vc.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(closeSheet)); vc.navigationItem.rightBarButtonItem?.accessibilityIdentifier = "uikit.sheet.done"; present(nav, animated: true) }
+    @objc private func closeSheet() { dismiss(animated: true) }
+    @objc private func showAlert() { let alert = UIAlertController(title: "Confirm action", message: nil, preferredStyle: .alert); alert.addAction(UIAlertAction(title: "Cancel", style: .cancel)); alert.addAction(UIAlertAction(title: "Confirm", style: .default) { _ in self.count += 10; self.countLabel.text = "Count: \(self.count)" }); present(alert, animated: true) }
+}
+
+final class DetailController: UIViewController {
+    init(index: Int) { super.init(nibName: nil, bundle: nil); title = "Detail \(index)"; view.accessibilityIdentifier = "uikit.detail.\(index)" }
+    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
+    override func viewDidLoad() { super.viewDidLoad(); view.backgroundColor = .systemBackground }
+}

test/fixtures/ios-qa/FixtureApp/Sources/AdaptiveUIKitFixture/Info.plist

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>UIKit QA Gallery</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>UILaunchScreen</key>
+	<dict/>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
+</dict>
+</plist>

test/fixtures/ios-qa/FixtureApp/Tests/AdaptiveFixtureUITests/AdaptiveFixtureUITests.swift

@@ -0,0 +1,56 @@
+import XCTest
+
+final class AdaptiveFixtureUITests: XCTestCase {
+    override func setUpWithError() throws { continueAfterFailure = false }
+
+    func testSwiftUIActionsInputModalAndVerticalNavigation() {
+        let app = XCUIApplication(bundleIdentifier: "com.gstack.iosqa.adaptive.swiftui")
+        app.launch()
+        app.buttons["swiftui.increment"].tap()
+        XCTAssertEqual(app.staticTexts["swiftui.count"].label, "Count: 1")
+        XCTAssertFalse(app.buttons["swiftui.disabled"].isEnabled)
+        app.textFields["swiftui.search"].tap(); app.textFields["swiftui.search"].typeText("adapt")
+        XCTAssertEqual(app.staticTexts["swiftui.echo"].label, "Echo: adapt")
+        app.buttons["swiftui.sheet.open"].tap(); XCTAssertTrue(app.staticTexts["swiftui.sheet.content"].waitForExistence(timeout: 2)); app.buttons["swiftui.sheet.done"].tap()
+        app.buttons["swiftui.alert.open"].tap(); app.alerts.buttons["Confirm"].tap()
+        XCTAssertEqual(app.staticTexts["swiftui.count"].label, "Count: 11")
+        let row = app.buttons["swiftui.row.30"]; for _ in 0..<12 where !row.isHittable { app.swipeUp() }; XCTAssertTrue(row.isHittable); row.tap()
+        XCTAssertTrue(app.staticTexts["swiftui.detail.30"].waitForExistence(timeout: 2))
+    }
+
+    func testUIKitActionsInputModalAndVerticalNavigation() {
+        let app = XCUIApplication(bundleIdentifier: "com.gstack.iosqa.adaptive.uikit")
+        app.launch()
+        app.buttons["uikit.increment"].tap()
+        XCTAssertEqual(app.staticTexts["uikit.count"].label, "Count: 1")
+        XCTAssertFalse(app.buttons["uikit.disabled"].isEnabled)
+        app.textFields["uikit.search"].tap(); app.textFields["uikit.search"].typeText("adapt")
+        XCTAssertEqual(app.staticTexts["uikit.echo"].label, "Echo: adapt")
+        app.buttons["uikit.sheet.open"].tap(); XCTAssertTrue(app.otherElements["uikit.sheet.content"].waitForExistence(timeout: 2)); app.buttons["uikit.sheet.done"].tap()
+        app.buttons["uikit.alert.open"].tap(); app.alerts.buttons["Confirm"].tap()
+        XCTAssertEqual(app.staticTexts["uikit.count"].label, "Count: 11")
+        let row = app.buttons["uikit.row.30"]; for _ in 0..<12 where !row.isHittable { app.swipeUp() }; XCTAssertTrue(row.isHittable); row.tap()
+        XCTAssertTrue(app.otherElements["uikit.detail.30"].waitForExistence(timeout: 2))
+    }
+
+    func testNestedHorizontalScrollingUsesContainerNotScreenCoordinates() {
+        for bundle in ["com.gstack.iosqa.adaptive.swiftui", "com.gstack.iosqa.adaptive.uikit"] {
+            let app = XCUIApplication(bundleIdentifier: bundle); app.launch()
+            let prefix = bundle.hasSuffix("swiftui") ? "swiftui" : "uikit"
+            let container = app.scrollViews["\(prefix).horizontal-scroll"]
+            for _ in 0..<4 where !container.exists { app.swipeUp() }
+            XCTAssertTrue(container.waitForExistence(timeout: 2))
+            let card = app.buttons["\(prefix).card.11"]
+            for _ in 0..<8 where !card.isHittable { container.swipeLeft() }
+            XCTAssertTrue(card.isHittable)
+        }
+    }
+
+    func testUIKitOccludedControlExistsButIsNotHittable() {
+        let app = XCUIApplication(bundleIdentifier: "com.gstack.iosqa.adaptive.uikit"); app.launch()
+        let target = app.buttons["uikit.occluded"]
+        for _ in 0..<16 where !target.exists { app.swipeUp() }
+        XCTAssertTrue(target.exists)
+        XCTAssertFalse(target.isHittable)
+    }
+}

test/fixtures/ios-qa/FixtureApp/Tests/AdaptiveFixtureUITests/GStackFlowRunnerUITests.swift

@@ -0,0 +1,263 @@
+import Foundation
+import XCTest
+
+/// Concrete XCUITest adapter for the JSON contract in ios-qa/executor/contract.ts.
+/// The environment supplies the flow path; xcodebuild remains responsible for routing
+/// this exact runner to either a simulator or a provisioned physical device.
+final class GStackFlowRunnerUITests: XCTestCase {
+    private struct Flow: Decodable {
+        let version: Int
+        let name: String
+        let bundleIdentifier: String?
+        let steps: [Step]
+    }
+
+    private struct Selector: Decodable {
+        let identifier: String?
+        let label: String?
+        let role: String?
+    }
+
+    private struct Verification: Decodable {
+        let kind: String
+        let selector: Selector
+        let value: String?
+        let timeoutMs: Int?
+    }
+
+    private struct Step: Decodable {
+        let id: String
+        let action: String
+        let arguments: [String]?
+        let environment: [String: String]?
+        let selector: Selector?
+        let text: String?
+        let clear: Bool?
+        let timeoutMs: Int?
+        let direction: String?
+        let verify: Verification?
+        let verification: Verification?
+    }
+
+    private enum RunnerError: Error, CustomStringConvertible {
+        case blocked(String)
+        case unsupported(String)
+        case step(String, String)
+
+        var description: String {
+            switch self {
+            case .blocked(let message): return "BLOCKED: \(message)"
+            case .unsupported(let message): return "UNSUPPORTED: \(message)"
+            case .step(let id, let message): return "STEP \(id) FAILED: \(message)"
+            }
+        }
+    }
+
+    override func setUpWithError() throws {
+        continueAfterFailure = false
+    }
+
+    func testFlow() throws {
+        do {
+            let flow = try loadFlow()
+            guard flow.version == 1 else { throw RunnerError.unsupported("flow version \(flow.version)") }
+            guard let bundleIdentifier = flow.bundleIdentifier, !bundleIdentifier.isEmpty else {
+                throw RunnerError.blocked("bundleIdentifier is required by the XCUITest runner")
+            }
+            let app = XCUIApplication(bundleIdentifier: bundleIdentifier)
+            for step in flow.steps {
+                try execute(step, in: app)
+            }
+        } catch {
+            XCTFail(String(describing: error))
+            throw error
+        }
+    }
+
+    private func loadFlow() throws -> Flow {
+        if let encoded = ProcessInfo.processInfo.environment["GSTACK_IOS_QA_FLOW_JSON_BASE64"],
+           !encoded.isEmpty {
+            guard let data = Data(base64Encoded: encoded) else {
+                throw RunnerError.blocked("GSTACK_IOS_QA_FLOW_JSON_BASE64 is invalid")
+            }
+            do {
+                return try JSONDecoder().decode(Flow.self, from: data)
+            } catch {
+                throw RunnerError.blocked("cannot decode inline flow JSON: \(error)")
+            }
+        }
+        guard let path = ProcessInfo.processInfo.environment["GSTACK_IOS_QA_FLOW_PATH"], !path.isEmpty else {
+            throw RunnerError.blocked("neither inline flow JSON nor GSTACK_IOS_QA_FLOW_PATH is set")
+        }
+        do {
+            return try JSONDecoder().decode(Flow.self, from: Data(contentsOf: URL(fileURLWithPath: path)))
+        } catch {
+            throw RunnerError.blocked("cannot decode flow at \(path): \(error)")
+        }
+    }
+
+    private func execute(_ step: Step, in app: XCUIApplication) throws {
+        do {
+            switch step.action {
+            case "launch":
+                app.launchArguments = step.arguments ?? []
+                app.launchEnvironment = step.environment ?? [:]
+                app.launch()
+            case "tap":
+                let resolved = try resolve(requiredSelector(step), in: app, timeoutMs: step.timeoutMs)
+                // If the identifier lands on a wrapper, target the actual switch inside it.
+                let element = resolved.elementType == .switch
+                    ? resolved
+                    : (resolved.switches.firstMatch.exists ? resolved.switches.firstMatch : resolved)
+                guard waitUntilHittable(element, timeoutMs: step.timeoutMs) else {
+                    throw RunnerError.step(step.id, "element exists but is not hittable")
+                }
+                if element.elementType == .switch {
+                    try tapSwitch(element, stepID: step.id)
+                } else {
+                    element.tap()
+                }
+            case "typeText":
+                let element = try resolve(requiredSelector(step), in: app, timeoutMs: step.timeoutMs)
+                guard waitUntilHittable(element, timeoutMs: step.timeoutMs) else {
+                    throw RunnerError.step(step.id, "text element exists but is not hittable")
+                }
+                guard let text = step.text else { throw RunnerError.step(step.id, "typeText is missing text") }
+                element.tap()
+                if step.clear == true, let current = element.value as? String, !current.isEmpty {
+                    element.typeText(String(repeating: XCUIKeyboardKey.delete.rawValue, count: current.count))
+                }
+                element.typeText(text)
+            case "swipe":
+                let element = try step.selector.map { try resolve($0, in: app, timeoutMs: step.timeoutMs) } ?? app
+                switch step.direction {
+                case "up": element.swipeUp()
+                case "down": element.swipeDown()
+                case "left": element.swipeLeft()
+                case "right": element.swipeRight()
+                default: throw RunnerError.step(step.id, "unsupported swipe direction \(step.direction ?? "<missing>")")
+                }
+            case "wait":
+                guard let verification = step.verification else { throw RunnerError.step(step.id, "wait is missing verification") }
+                try verify(verification, in: app, stepID: step.id)
+            default:
+                throw RunnerError.unsupported("action \(step.action) at step \(step.id)")
+            }
+            if let verification = step.verify {
+                try verify(verification, in: app, stepID: step.id)
+            }
+        } catch let error as RunnerError {
+            throw error
+        } catch {
+            throw RunnerError.step(step.id, String(describing: error))
+        }
+    }
+
+    private func requiredSelector(_ step: Step) throws -> Selector {
+        guard let selector = step.selector else { throw RunnerError.step(step.id, "action is missing selector") }
+        return selector
+    }
+
+    /// Identifier is resolved first. A label is only a fallback after the identifier
+    /// query has had its bounded existence wait; no screen-coordinate fallback exists.
+    private func resolve(_ selector: Selector, in app: XCUIApplication, timeoutMs: Int?) throws -> XCUIElement {
+        let query = query(for: selector.role, in: app)
+        let timeout = seconds(timeoutMs)
+        if let identifier = selector.identifier, !identifier.isEmpty {
+            let candidate = query.matching(identifier: identifier).firstMatch
+            if candidate.waitForExistence(timeout: timeout) { return candidate }
+        }
+        if let label = selector.label, !label.isEmpty {
+            let candidate = query.matching(NSPredicate(format: "label == %@", label)).firstMatch
+            if candidate.waitForExistence(timeout: timeout) { return candidate }
+        }
+        throw RunnerError.blocked("no element resolved by identifier/label (role: \(selector.role ?? "any"))")
+    }
+
+    private func query(for role: String?, in app: XCUIApplication) -> XCUIElementQuery {
+        let type: XCUIElement.ElementType
+        switch role {
+        case nil: type = .any
+        case "button": type = .button
+        case "cell": type = .cell
+        case "link": type = .link
+        case "navigationBar": type = .navigationBar
+        case "secureTextField": type = .secureTextField
+        case "staticText": type = .staticText
+        case "switch": type = .switch
+        case "textField": type = .textField
+        default: type = .any
+        }
+        return app.descendants(matching: type)
+    }
+
+    /// Toggle a switch and confirm its value actually changed. A SwiftUI Toggle
+    /// spans its whole row, so XCUIElement.tap() (geometric center) lands on the
+    /// label and misses the control. Center-tap first (correct for a narrow native
+    /// switch); if the value doesn't move, retry on the trailing edge via an
+    /// element-anchored normalized offset — still adaptive, resolved from the
+    /// element's live frame, not a raw screen coordinate. If it still doesn't
+    /// change, that's an interaction failure, reported as such rather than as a
+    /// confirmed product defect.
+    private func tapSwitch(_ element: XCUIElement, stepID: String) throws {
+        let before = element.value as? String
+        element.tap()
+        if let before, settledValue(of: element) == before {
+            element.coordinate(withNormalizedOffset: CGVector(dx: 0.9, dy: 0.5)).tap()
+        }
+        if let before, let after = settledValue(of: element), before == after {
+            throw RunnerError.step(stepID, "switch tap did not change its value (stayed \(before.debugDescription)); the control was not activated, so this is an interaction failure, not a confirmed product defect")
+        }
+    }
+
+    /// Re-read a control's value after a short settle so a post-tap comparison
+    /// reflects the committed state, not an in-flight animation frame.
+    private func settledValue(of element: XCUIElement) -> String? {
+        RunLoop.current.run(until: Date().addingTimeInterval(0.3))
+        return element.value as? String
+    }
+
+    private func waitUntilHittable(_ element: XCUIElement, timeoutMs: Int?) -> Bool {
+        let deadline = Date().addingTimeInterval(seconds(timeoutMs))
+        repeat {
+            if element.exists && element.isHittable { return true }
+            RunLoop.current.run(until: Date().addingTimeInterval(0.05))
+        } while Date() < deadline
+        return element.exists && element.isHittable
+    }
+
+    private func verify(_ verification: Verification, in app: XCUIApplication, stepID: String) throws {
+        let timeout = verification.timeoutMs
+        switch verification.kind {
+        case "exists":
+            _ = try resolve(verification.selector, in: app, timeoutMs: timeout)
+        case "notExists":
+            let candidates = unresolvedCandidates(verification.selector, in: app)
+            let deadline = Date().addingTimeInterval(seconds(timeout))
+            while candidates.contains(where: \.exists), Date() < deadline {
+                RunLoop.current.run(until: Date().addingTimeInterval(0.05))
+            }
+            guard !candidates.contains(where: \.exists) else { throw RunnerError.step(stepID, "expected element not to exist") }
+        case "labelEquals":
+            guard let expected = verification.value else { throw RunnerError.step(stepID, "labelEquals is missing value") }
+            let element = try resolve(verification.selector, in: app, timeoutMs: timeout)
+            guard element.label == expected else {
+                throw RunnerError.step(stepID, "expected label \(expected.debugDescription), got \(element.label.debugDescription)")
+            }
+        default:
+            throw RunnerError.unsupported("verification \(verification.kind) at step \(stepID)")
+        }
+    }
+
+    private func unresolvedCandidates(_ selector: Selector, in app: XCUIApplication) -> [XCUIElement] {
+        let query = query(for: selector.role, in: app)
+        var elements: [XCUIElement] = []
+        if let identifier = selector.identifier, !identifier.isEmpty { elements.append(query.matching(identifier: identifier).firstMatch) }
+        if let label = selector.label, !label.isEmpty { elements.append(query.matching(NSPredicate(format: "label == %@", label)).firstMatch) }
+        return elements
+    }
+
+    private func seconds(_ timeoutMs: Int?) -> TimeInterval {
+        TimeInterval(timeoutMs ?? 10_000) / 1_000
+    }
+}

test/fixtures/ios-qa/FixtureApp/project.yml

@@ -47,3 +47,73 @@ targets:
         SWIFT_VERSION: "5.9"
         IPHONEOS_DEPLOYMENT_TARGET: "16.0"
         ENABLE_PREVIEWS: YES
+
+  AdaptiveSwiftUIFixture:
+    type: application
+    platform: iOS
+    deploymentTarget: "16.0"
+    sources:
+      - path: Sources/AdaptiveSwiftUIFixture
+    info:
+      path: Sources/AdaptiveSwiftUIFixture/Info.plist
+      properties:
+        CFBundleDisplayName: SwiftUI QA Gallery
+        UILaunchScreen: {}
+        UISupportedInterfaceOrientations: [UIInterfaceOrientationPortrait]
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: com.gstack.iosqa.adaptive.swiftui
+        CODE_SIGNING_ALLOWED: NO
+        TARGETED_DEVICE_FAMILY: "1"
+        SWIFT_VERSION: "5.9"
+
+  AdaptiveUIKitFixture:
+    type: application
+    platform: iOS
+    deploymentTarget: "16.0"
+    sources:
+      - path: Sources/AdaptiveUIKitFixture
+    info:
+      path: Sources/AdaptiveUIKitFixture/Info.plist
+      properties:
+        CFBundleDisplayName: UIKit QA Gallery
+        UILaunchScreen: {}
+        UISupportedInterfaceOrientations: [UIInterfaceOrientationPortrait]
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: com.gstack.iosqa.adaptive.uikit
+        CODE_SIGNING_ALLOWED: NO
+        TARGETED_DEVICE_FAMILY: "1"
+        SWIFT_VERSION: "5.9"
+
+  AdaptiveFixtureUITests:
+    type: bundle.ui-testing
+    platform: iOS
+    deploymentTarget: "16.0"
+    sources:
+      - path: Tests/AdaptiveFixtureUITests
+    dependencies:
+      - target: AdaptiveSwiftUIFixture
+      - target: AdaptiveUIKitFixture
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: com.gstack.iosqa.adaptive.uitests
+        GENERATE_INFOPLIST_FILE: YES
+        CODE_SIGNING_ALLOWED: NO
+        SWIFT_VERSION: "5.9"
+
+schemes:
+  AdaptiveFixtureUITests:
+    build:
+      targets:
+        AdaptiveSwiftUIFixture: all
+        AdaptiveUIKitFixture: all
+        AdaptiveFixtureUITests: [test]
+    test:
+      config: Debug
+      targets:
+        - AdaptiveFixtureUITests
+      environmentVariables:
+        GSTACK_IOS_QA_FLOW_PATH: $(GSTACK_IOS_QA_FLOW_PATH_VALUE)
+        GSTACK_IOS_QA_FLOW_JSON_BASE64: $(GSTACK_IOS_QA_FLOW_JSON_BASE64_VALUE)
+        GSTACK_IOS_QA_TARGET_KIND: $(GSTACK_IOS_QA_TARGET_KIND_VALUE)