Add login flow, session routing, and MainTab shell aligned with reference UI.

Implement token-based root routing, Android-matched login screen, five-slot MainTabBar with scan action, and placeholder tab pages.

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkan/UI/Common/AgreementRowView.swift

@@ -0,0 +1,114 @@
+//
+//  AgreementRowView.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 协议勾选行，对应 Android `AgreementRow`。
+final class AgreementRowView: UIView, UITextViewDelegate {
+
+    private let checkButton = UIButton(type: .custom)
+    private let textView = UITextView()
+
+    var isChecked = false {
+        didSet { updateCheckboxImage() }
+    }
+
+    var onCheckedChange: (() -> Void)?
+    var onUserAgreementTap: (() -> Void)?
+    var onPrivacyPolicyTap: (() -> Void)?
+
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        setupUI()
+        setupConstraints()
+    }
+
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    private func setupUI() {
+        checkButton.addTarget(self, action: #selector(checkButtonTapped), for: .touchUpInside)
+        updateCheckboxImage()
+
+        textView.backgroundColor = .clear
+        textView.isEditable = false
+        textView.isScrollEnabled = false
+        textView.textContainerInset = .zero
+        textView.textContainer.lineFragmentPadding = 0
+        textView.delegate = self
+        textView.linkTextAttributes = [
+            .foregroundColor: AppColor.agreementLink,
+            .font: UIFont.systemFont(ofSize: 12, weight: .semibold),
+        ]
+        textView.attributedText = makeAgreementText()
+
+        addSubview(checkButton)
+        addSubview(textView)
+    }
+
+    private func setupConstraints() {
+        checkButton.snp.makeConstraints { make in
+            make.leading.top.equalToSuperview()
+            make.size.equalTo(18)
+        }
+
+        textView.snp.makeConstraints { make in
+            make.leading.equalTo(checkButton.snp.trailing).offset(8)
+            make.trailing.top.bottom.equalToSuperview()
+        }
+    }
+
+    private func updateCheckboxImage() {
+        let imageName = isChecked ? "icon_cb_privacy_selected" : "icon_cb_privacy_unselect"
+        checkButton.setImage(UIImage(named: imageName), for: .normal)
+    }
+
+    private func makeAgreementText() -> NSAttributedString {
+        let result = NSMutableAttributedString()
+        let normalAttributes: [NSAttributedString.Key: Any] = [
+            .font: UIFont.systemFont(ofSize: 12),
+            .foregroundColor: AppColor.text666,
+        ]
+        let linkFont = UIFont.systemFont(ofSize: 12, weight: .semibold)
+
+        result.append(NSAttributedString(string: "已阅读并同意", attributes: normalAttributes))
+        result.append(NSAttributedString(string: "《用户协议》", attributes: [
+            .font: linkFont,
+            .foregroundColor: AppColor.agreementLink,
+            .link: "tos",
+        ]))
+        result.append(NSAttributedString(string: "与", attributes: normalAttributes))
+        result.append(NSAttributedString(string: "《隐私政策》", attributes: [
+            .font: linkFont,
+            .foregroundColor: AppColor.agreementLink,
+            .link: "privacy",
+        ]))
+        return result
+    }
+
+    @objc private func checkButtonTapped() {
+        onCheckedChange?()
+    }
+
+    func textView(
+        _ textView: UITextView,
+        shouldInteractWith URL: URL,
+        in characterRange: NSRange,
+        interaction: UITextItemInteraction
+    ) -> Bool {
+        switch URL.absoluteString {
+        case "tos":
+            onUserAgreementTap?()
+        case "privacy":
+            onPrivacyPolicyTap?()
+        default:
+            break
+        }
+        return false
+    }
+}

suixinkan/UI/Common/AppButton.swift

@@ -0,0 +1,59 @@
+//
+//  AppButton.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 主按钮，对应 Android `AppButton`。
+final class AppButton: UIButton {
+
+    enum Style {
+        case primary
+        case secondary
+    }
+
+    private let style: Style
+
+    init(title: String, style: Style = .primary) {
+        self.style = style
+        super.init(frame: .zero)
+        setupUI(title: title)
+    }
+
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override var isEnabled: Bool {
+        didSet { updateAppearance() }
+    }
+
+    private func setupUI(title: String) {
+        titleLabel?.font = .systemFont(ofSize: 14, weight: .regular)
+        layer.cornerRadius = 10
+        clipsToBounds = true
+        setTitle(title, for: .normal)
+        updateAppearance()
+
+        snp.makeConstraints { make in
+            make.height.equalTo(46)
+        }
+    }
+
+    private func updateAppearance() {
+        switch style {
+        case .primary:
+            backgroundColor = isEnabled ? AppColor.primary : AppColor.buttonDisabled
+            setTitleColor(.white, for: .normal)
+            setTitleColor(.white, for: .disabled)
+        case .secondary:
+            backgroundColor = AppColor.secondaryButtonBackground
+            setTitleColor(AppColor.primary, for: .normal)
+            setTitleColor(AppColor.primary, for: .disabled)
+            alpha = isEnabled ? 1 : 0.6
+        }
+    }
+}

suixinkan/UI/Common/LoginTextField.swift

@@ -0,0 +1,83 @@
+//
+//  LoginTextField.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 登录页账号输入框，对应 Android `PhoneInputField`。
+final class LoginTextField: UIView {
+
+    private let textField = UITextField()
+
+    var text: String {
+        get { textField.text ?? "" }
+        set { textField.text = newValue }
+    }
+
+    var onTextChange: ((String) -> Void)?
+    var onReturnKey: (() -> Void)?
+
+    init(placeholder: String) {
+        super.init(frame: .zero)
+        setupUI(placeholder: placeholder)
+        setupConstraints()
+    }
+
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    @discardableResult
+    override func becomeFirstResponder() -> Bool {
+        textField.becomeFirstResponder()
+    }
+
+    private func setupUI(placeholder: String) {
+        backgroundColor = AppColor.inputBackground
+        layer.cornerRadius = 12
+        clipsToBounds = true
+
+        textField.font = .systemFont(ofSize: 14)
+        textField.textColor = AppColor.text333
+        textField.autocapitalizationType = .none
+        textField.autocorrectionType = .no
+        textField.returnKeyType = .next
+        textField.clearButtonMode = .whileEditing
+        textField.delegate = self
+
+        let attributes: [NSAttributedString.Key: Any] = [
+            .foregroundColor: AppColor.placeholder,
+            .font: UIFont.systemFont(ofSize: 14),
+        ]
+        textField.attributedPlaceholder = NSAttributedString(string: placeholder, attributes: attributes)
+
+        textField.addTarget(self, action: #selector(textDidChange), for: .editingChanged)
+        addSubview(textField)
+    }
+
+    private func setupConstraints() {
+        snp.makeConstraints { make in
+            make.height.equalTo(46)
+        }
+
+        textField.snp.makeConstraints { make in
+            make.leading.trailing.equalToSuperview().inset(16)
+            make.centerY.equalToSuperview()
+        }
+    }
+
+    @objc private func textDidChange() {
+        onTextChange?(text)
+    }
+}
+
+extension LoginTextField: UITextFieldDelegate {
+
+    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
+        onReturnKey?()
+        return true
+    }
+}

suixinkan/UI/Common/PasswordInputField.swift

@@ -0,0 +1,104 @@
+//
+//  PasswordInputField.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 登录页密码输入框，对应 Android `PasswordInputField`。
+final class PasswordInputField: UIView {
+
+    private let textField = UITextField()
+    private let toggleButton = UIButton(type: .custom)
+
+    private var isPasswordVisible = false
+
+    var text: String {
+        get { textField.text ?? "" }
+        set { textField.text = newValue }
+    }
+
+    var onTextChange: ((String) -> Void)?
+    var onReturnKey: (() -> Void)?
+
+    init(placeholder: String = "请输入密码") {
+        super.init(frame: .zero)
+        setupUI(placeholder: placeholder)
+        setupConstraints()
+    }
+
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    @discardableResult
+    override func becomeFirstResponder() -> Bool {
+        textField.becomeFirstResponder()
+    }
+
+    private func setupUI(placeholder: String) {
+        backgroundColor = AppColor.inputBackground
+        layer.cornerRadius = 12
+        clipsToBounds = true
+
+        textField.font = .systemFont(ofSize: 14)
+        textField.textColor = AppColor.text333
+        textField.isSecureTextEntry = true
+        textField.autocapitalizationType = .none
+        textField.autocorrectionType = .no
+        textField.returnKeyType = .done
+        textField.delegate = self
+
+        let attributes: [NSAttributedString.Key: Any] = [
+            .foregroundColor: AppColor.placeholder,
+            .font: UIFont.systemFont(ofSize: 14),
+        ]
+        textField.attributedPlaceholder = NSAttributedString(string: placeholder, attributes: attributes)
+        textField.addTarget(self, action: #selector(textDidChange), for: .editingChanged)
+
+        toggleButton.setImage(UIImage(named: "icon_pwd_invisible"), for: .normal)
+        toggleButton.addTarget(self, action: #selector(togglePasswordVisibility), for: .touchUpInside)
+
+        addSubview(textField)
+        addSubview(toggleButton)
+    }
+
+    private func setupConstraints() {
+        snp.makeConstraints { make in
+            make.height.equalTo(46)
+        }
+
+        toggleButton.snp.makeConstraints { make in
+            make.trailing.equalToSuperview().inset(8)
+            make.centerY.equalToSuperview()
+            make.size.equalTo(30)
+        }
+
+        textField.snp.makeConstraints { make in
+            make.leading.equalToSuperview().inset(16)
+            make.trailing.equalTo(toggleButton.snp.leading).offset(-4)
+            make.centerY.equalToSuperview()
+        }
+    }
+
+    @objc private func textDidChange() {
+        onTextChange?(text)
+    }
+
+    @objc private func togglePasswordVisibility() {
+        isPasswordVisible.toggle()
+        textField.isSecureTextEntry = !isPasswordVisible
+        let imageName = isPasswordVisible ? "icon_pwd_visible" : "icon_pwd_invisible"
+        toggleButton.setImage(UIImage(named: imageName), for: .normal)
+    }
+}
+
+extension PasswordInputField: UITextFieldDelegate {
+
+    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
+        onReturnKey?()
+        return true
+    }
+}

suixinkan/UI/Home/HomeViewController.swift

@@ -0,0 +1,32 @@
+//
+//  HomeViewController.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 首页 Tab 根页面。
+final class HomeViewController: BaseViewController {
+
+    private let titleLabel = UILabel()
+
+    override func setupNavigationBar() {
+        navigationController?.setNavigationBarHidden(true, animated: false)
+    }
+
+    override func setupUI() {
+        view.backgroundColor = UIColor(hex: 0xF7FAFF)
+        titleLabel.text = "首页"
+        titleLabel.font = .systemFont(ofSize: 24, weight: .medium)
+        titleLabel.textAlignment = .center
+        titleLabel.textColor = AppColor.text333
+        view.addSubview(titleLabel)
+    }
+
+    override func setupConstraints() {
+        titleLabel.snp.makeConstraints { make in
+            make.center.equalToSuperview()
+        }
+    }
+}

suixinkan/UI/Login/LoginViewController.swift

@@ -0,0 +1,224 @@
+//
+//  LoginViewController.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 登录页，UI 严格对齐 Android `LoginScreen`。
+final class LoginViewController: BaseViewController {
+
+    private let viewModel = LoginViewModel()
+
+    private let backgroundImageView = UIImageView()
+    private let welcomeLabel = UILabel()
+    private let formCardView = UIView()
+    private let topFormStack = UIStackView()
+    private let accountField = LoginTextField(placeholder: "请输入账号")
+    private let passwordField = PasswordInputField()
+    private let agreementRow = AgreementRowView()
+    private let loginButton = AppButton(title: "登录", style: .primary)
+    private let loginByCodeButton = AppButton(title: "验证码登录", style: .secondary)
+    private let registerContainer = UIStackView()
+    private let registerPrefixLabel = UILabel()
+    private let registerButton = UIButton(type: .system)
+
+    private var hasPlayedEntranceAnimation = false
+
+    override var preferredStatusBarStyle: UIStatusBarStyle {
+        .lightContent
+    }
+
+    override func setupNavigationBar() {
+        navigationController?.setNavigationBarHidden(true, animated: false)
+    }
+
+    override func setupUI() {
+        view.backgroundColor = .black
+
+        backgroundImageView.image = UIImage(named: "img_login_bg")
+        backgroundImageView.contentMode = .scaleAspectFill
+        backgroundImageView.clipsToBounds = true
+
+        welcomeLabel.text = "欢迎使用\n随心瞰商家版"
+        welcomeLabel.numberOfLines = 2
+        welcomeLabel.font = .systemFont(ofSize: 28, weight: .semibold)
+        welcomeLabel.textColor = .white
+
+        formCardView.backgroundColor = .white
+        formCardView.layer.cornerRadius = 16
+        formCardView.clipsToBounds = true
+
+        topFormStack.axis = .vertical
+        topFormStack.spacing = 0
+        topFormStack.alignment = .fill
+
+        loginButton.addTarget(self, action: #selector(loginButtonTapped), for: .touchUpInside)
+        loginByCodeButton.addTarget(self, action: #selector(loginByCodeButtonTapped), for: .touchUpInside)
+
+        registerContainer.axis = .horizontal
+        registerContainer.alignment = .center
+        registerContainer.spacing = 0
+
+        registerPrefixLabel.text = "没有账号？"
+        registerPrefixLabel.font = .systemFont(ofSize: 14, weight: .medium)
+        registerPrefixLabel.textColor = AppColor.text333
+
+        registerButton.setTitle("去注册", for: .normal)
+        registerButton.titleLabel?.font = .systemFont(ofSize: 14, weight: .medium)
+        registerButton.setTitleColor(AppColor.primary, for: .normal)
+        registerButton.addTarget(self, action: #selector(registerButtonTapped), for: .touchUpInside)
+
+        registerContainer.addArrangedSubview(registerPrefixLabel)
+        registerContainer.addArrangedSubview(registerButton)
+
+        view.addSubview(backgroundImageView)
+        view.addSubview(welcomeLabel)
+        view.addSubview(formCardView)
+        formCardView.addSubview(topFormStack)
+        formCardView.addSubview(registerContainer)
+
+        topFormStack.addArrangedSubview(accountField)
+        topFormStack.setCustomSpacing(8, after: accountField)
+        topFormStack.addArrangedSubview(passwordField)
+        topFormStack.setCustomSpacing(24, after: passwordField)
+        topFormStack.addArrangedSubview(agreementRow)
+        topFormStack.setCustomSpacing(16, after: agreementRow)
+        topFormStack.addArrangedSubview(loginButton)
+        topFormStack.setCustomSpacing(8, after: loginButton)
+        topFormStack.addArrangedSubview(loginByCodeButton)
+
+        bindViewModel()
+        updateUI()
+    }
+
+    override func setupConstraints() {
+        backgroundImageView.snp.makeConstraints { make in
+            make.edges.equalToSuperview()
+        }
+
+        welcomeLabel.snp.makeConstraints { make in
+            make.top.equalTo(view.safeAreaLayoutGuide).offset(48)
+            make.leading.trailing.equalToSuperview().inset(24)
+        }
+
+        formCardView.snp.makeConstraints { make in
+            make.top.equalTo(welcomeLabel.snp.bottom).offset(48)
+            make.leading.trailing.equalToSuperview().inset(24)
+            make.bottom.equalTo(view.safeAreaLayoutGuide).offset(-24)
+        }
+
+        topFormStack.snp.makeConstraints { make in
+            make.top.leading.trailing.equalToSuperview().inset(16)
+            make.bottom.equalToSuperview().inset(16)
+        }
+
+        registerContainer.snp.makeConstraints { make in
+            make.centerX.equalToSuperview()
+            make.bottom.equalToSuperview().inset(16)
+        }
+    }
+
+    override func bindActions() {
+        accountField.onTextChange = { [weak self] text in
+            self?.viewModel.updateAccount(text)
+        }
+        accountField.onReturnKey = { [weak self] in
+            self?.passwordField.becomeFirstResponder()
+        }
+
+        passwordField.onTextChange = { [weak self] text in
+            self?.viewModel.updatePassword(text)
+        }
+        passwordField.onReturnKey = { [weak self] in
+            self?.view.endEditing(true)
+            self?.viewModel.login()
+        }
+
+        agreementRow.onCheckedChange = { [weak self] in
+            self?.viewModel.togglePrivacyChecked()
+        }
+        agreementRow.onUserAgreementTap = { [weak self] in
+            self?.viewModel.onUserAgreement?()
+        }
+        agreementRow.onPrivacyPolicyTap = { [weak self] in
+            self?.viewModel.onPrivacyPolicy?()
+        }
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        playEntranceAnimationIfNeeded()
+    }
+
+    private func bindViewModel() {
+        viewModel.onStateChange = { [weak self] in
+            self?.updateUI()
+        }
+        viewModel.onShowMessage = { [weak self] message in
+            self?.showToast(message)
+        }
+        viewModel.onLogin = { [weak self] in
+            self?.showToast("登录功能待接入")
+        }
+        viewModel.onLoginByCode = { [weak self] in
+            self?.showToast("验证码登录待接入")
+        }
+        viewModel.onRegister = { [weak self] in
+            self?.showToast("注册待接入")
+        }
+        viewModel.onUserAgreement = { [weak self] in
+            self?.showToast("用户协议待接入")
+        }
+        viewModel.onPrivacyPolicy = { [weak self] in
+            self?.showToast("隐私政策待接入")
+        }
+    }
+
+    private func updateUI() {
+        agreementRow.isChecked = viewModel.isPrivacyChecked
+        loginButton.isEnabled = viewModel.isLoginEnabled
+
+        let showRegisterSection = viewModel.enableRegister
+        loginByCodeButton.isHidden = !showRegisterSection
+        registerContainer.isHidden = !showRegisterSection
+
+        topFormStack.snp.remakeConstraints { make in
+            make.top.leading.trailing.equalToSuperview().inset(16)
+            if showRegisterSection {
+                make.bottom.lessThanOrEqualTo(registerContainer.snp.top).offset(-16)
+            } else {
+                make.bottom.equalToSuperview().inset(16)
+            }
+        }
+    }
+
+    private func playEntranceAnimationIfNeeded() {
+        guard !hasPlayedEntranceAnimation else { return }
+        hasPlayedEntranceAnimation = true
+
+        formCardView.transform = CGAffineTransform(translationX: 0, y: view.bounds.height)
+        welcomeLabel.alpha = 0
+
+        UIView.animate(withDuration: 0.4, delay: 0, options: .curveEaseOut) {
+            self.formCardView.transform = .identity
+            self.welcomeLabel.alpha = 1
+        }
+    }
+
+    @objc private func loginButtonTapped() {
+        view.endEditing(true)
+        viewModel.login()
+    }
+
+    @objc private func loginByCodeButtonTapped() {
+        view.endEditing(true)
+        viewModel.onLoginByCode?()
+    }
+
+    @objc private func registerButtonTapped() {
+        view.endEditing(true)
+        viewModel.onRegister?()
+    }
+}

suixinkan/UI/Login/LoginViewModel.swift

@@ -0,0 +1,61 @@
+//
+//  LoginViewModel.swift
+//  suixinkan
+//
+
+import Foundation
+
+/// 登录页 ViewModel，UI 状态与 Android `LoginViewModel` 对齐。
+final class LoginViewModel {
+
+    private(set) var account = ""
+    private(set) var password = ""
+    private(set) var isPrivacyChecked = false
+    private(set) var enableRegister = false
+
+    var isLoginEnabled: Bool {
+        !account.isEmpty && !password.isEmpty
+    }
+
+    var onStateChange: (() -> Void)?
+
+    func updateAccount(_ value: String) {
+        account = value
+        notifyStateChange()
+    }
+
+    func updatePassword(_ value: String) {
+        password = value
+        notifyStateChange()
+    }
+
+    func togglePrivacyChecked() {
+        isPrivacyChecked.toggle()
+        notifyStateChange()
+    }
+
+    func updateEnableRegister(_ enabled: Bool) {
+        enableRegister = enabled
+        notifyStateChange()
+    }
+
+    func login() {
+        guard isPrivacyChecked else {
+            onShowMessage?("请先阅读并同意用户协议与隐私政策")
+            return
+        }
+        guard isLoginEnabled else { return }
+        onLogin?()
+    }
+
+    var onShowMessage: ((String) -> Void)?
+    var onLogin: (() -> Void)?
+    var onLoginByCode: (() -> Void)?
+    var onRegister: (() -> Void)?
+    var onUserAgreement: (() -> Void)?
+    var onPrivacyPolicy: (() -> Void)?
+
+    private func notifyStateChange() {
+        onStateChange?()
+    }
+}

suixinkan/UI/MainTab/AppTab.swift

@@ -0,0 +1,64 @@
+//
+//  AppTab.swift
+//  suixinkan
+//
+
+import UIKit
+
+/// 主 Tab 实体，描述底部导航中的一级入口。
+enum AppTab: String, CaseIterable, Hashable {
+    case home
+    case orders
+    case statistics
+    case profile
+
+    var title: String {
+        switch self {
+        case .home: "首页"
+        case .orders: "订单"
+        case .statistics: "数据"
+        case .profile: "我的"
+        }
+    }
+
+    var selectedImageName: String {
+        switch self {
+        case .home: "tab_home_selected"
+        case .orders: "tab_order_selected"
+        case .statistics: "tab_data_selected"
+        case .profile: "tab_profile_selected"
+        }
+    }
+
+    var unselectedImageName: String {
+        switch self {
+        case .home: "tab_home_unselected"
+        case .orders: "tab_order_unselected"
+        case .statistics: "tab_data_unselected"
+        case .profile: "tab_profile_unselected"
+        }
+    }
+
+    /// 构建系统 TabBarItem。
+    func makeTabBarItem() -> UITabBarItem {
+        let unselectedImage = UIImage(named: unselectedImageName)?.withRenderingMode(.alwaysOriginal)
+        let selectedImage = UIImage(named: selectedImageName)?.withRenderingMode(.alwaysOriginal)
+        let item = UITabBarItem(title: title, image: unselectedImage, selectedImage: selectedImage)
+        item.accessibilityIdentifier = "main.tab.\(rawValue)"
+        return item
+    }
+
+    /// 构建 Tab 根页面。
+    func makeRootViewController() -> UIViewController {
+        switch self {
+        case .home:
+            return HomeViewController()
+        case .orders:
+            return OrdersViewController()
+        case .statistics:
+            return StatisticsViewController()
+        case .profile:
+            return ProfileViewController()
+        }
+    }
+}

suixinkan/UI/MainTab/MainScanTabItem.swift

@@ -0,0 +1,19 @@
+//
+//  MainScanTabItem.swift
+//  suixinkan
+//
+
+import UIKit
+
+/// 主 TabBar 中间扫码核销入口。
+enum MainScanTabItem {
+
+    /// 构建扫码 TabBarItem，点击行为由 `MainTabBarController` 拦截。
+    static func makeTabBarItem() -> UITabBarItem {
+        let image = UIImage(named: "icon_scan")?.withRenderingMode(.alwaysOriginal)
+        let item = UITabBarItem(title: nil, image: image, selectedImage: image)
+        item.accessibilityLabel = "扫码核销"
+        item.accessibilityIdentifier = "main.scan"
+        return item
+    }
+}

suixinkan/UI/MainTab/MainTabBadgeViewModel.swift

@@ -0,0 +1,21 @@
+//
+//  MainTabBadgeViewModel.swift
+//  suixinkan
+//
+
+import Foundation
+
+/// 主 Tab 角标 ViewModel，负责订单 Tab 待核销数量。
+final class MainTabBadgeViewModel {
+
+    var onChange: (() -> Void)?
+
+    private(set) var pendingWriteOffCount: Int? {
+        didSet { onChange?() }
+    }
+
+    /// 刷新待核销数量；接口未接入前保持为空。
+    func refreshPendingWriteOffCount() {
+        pendingWriteOffCount = nil
+    }
+}

suixinkan/UI/MainTab/MainTabBarController.swift

@@ -0,0 +1,154 @@
+//
+//  MainTabBarController.swift
+//  suixinkan
+//
+
+import UIKit
+
+/// 主 Tab 容器，展示四个一级入口及中间扫码按钮。
+final class MainTabBarController: UITabBarController {
+
+    private let badgeViewModel = MainTabBadgeViewModel()
+    private var tabNavigationControllers: [AppTab: TabNavigationController] = [:]
+    private var isSyncingTabSelection = false
+
+    /// 测试时可注入扫码点击处理。
+    var onScanTabSelected: (() -> Void)?
+
+    private enum TabSlot: CaseIterable {
+        case home
+        case orders
+        case scan
+        case statistics
+        case profile
+
+        var appTab: AppTab? {
+            switch self {
+            case .home: return .home
+            case .orders: return .orders
+            case .scan: return nil
+            case .statistics: return .statistics
+            case .profile: return .profile
+            }
+        }
+
+        static func index(for tab: AppTab) -> Int? {
+            allCases.firstIndex { $0.appTab == tab }
+        }
+
+        static var scanIndex: Int? {
+            allCases.firstIndex(of: .scan)
+        }
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        delegate = self
+        configureTabBarAppearance()
+        configureTabs()
+        bindBadgeViewModel()
+        badgeViewModel.refreshPendingWriteOffCount()
+    }
+
+    /// 选中指定主 Tab。
+    func selectTab(_ tab: AppTab) {
+        guard let index = TabSlot.index(for: tab) else { return }
+        guard selectedIndex != index else { return }
+        isSyncingTabSelection = true
+        selectedIndex = index
+        isSyncingTabSelection = false
+        if tab == .orders {
+            badgeViewModel.refreshPendingWriteOffCount()
+        }
+    }
+
+    private func configureTabBarAppearance() {
+        tabBar.tintColor = AppColor.primary
+        tabBar.backgroundColor = .white
+        tabBar.shadowImage = UIImage()
+
+        let normalAttributes: [NSAttributedString.Key: Any] = [
+            .foregroundColor: UIColor(hex: 0x7D8DA3),
+            .font: UIFont.systemFont(ofSize: 12, weight: .regular),
+        ]
+        let selectedAttributes: [NSAttributedString.Key: Any] = [
+            .foregroundColor: AppColor.primary,
+            .font: UIFont.systemFont(ofSize: 12, weight: .medium),
+        ]
+
+        let appearance = UITabBarAppearance()
+        appearance.configureWithOpaqueBackground()
+        appearance.backgroundColor = .white
+        appearance.shadowColor = .clear
+        appearance.stackedLayoutAppearance.normal.titleTextAttributes = normalAttributes
+        appearance.stackedLayoutAppearance.selected.titleTextAttributes = selectedAttributes
+        tabBar.standardAppearance = appearance
+        tabBar.scrollEdgeAppearance = appearance
+    }
+
+    private func configureTabs() {
+        tabNavigationControllers.removeAll()
+        viewControllers = TabSlot.allCases.map { slot in
+            if let tab = slot.appTab {
+                let navigationController = TabNavigationController(tab: tab)
+                navigationController.tabBarItem = tab.makeTabBarItem()
+                tabNavigationControllers[tab] = navigationController
+                return navigationController
+            }
+
+            let scannerPlaceholder = UIViewController()
+            scannerPlaceholder.tabBarItem = MainScanTabItem.makeTabBarItem()
+            return scannerPlaceholder
+        }
+    }
+
+    private func bindBadgeViewModel() {
+        badgeViewModel.onChange = { [weak self] in
+            self?.updateOrderBadge()
+        }
+    }
+
+    private func updateOrderBadge() {
+        let badgeValue: String?
+        if let count = badgeViewModel.pendingWriteOffCount, count > 0 {
+            badgeValue = "\(count)"
+        } else {
+            badgeValue = nil
+        }
+        tabNavigationControllers[.orders]?.tabBarItem.badgeValue = badgeValue
+    }
+
+    private func presentGlobalScanner() {
+        guard presentedViewController == nil else { return }
+
+        let scanner = ScanPlaceholderViewController()
+        let navigationController = UINavigationController(rootViewController: scanner)
+        navigationController.modalPresentationStyle = .fullScreen
+        present(navigationController, animated: true)
+    }
+}
+
+extension MainTabBarController: UITabBarControllerDelegate {
+
+    func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
+        guard viewControllers?.firstIndex(of: viewController) == TabSlot.scanIndex else {
+            return true
+        }
+
+        if let onScanTabSelected {
+            onScanTabSelected()
+        } else {
+            presentGlobalScanner()
+        }
+        return false
+    }
+
+    func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
+        guard !isSyncingTabSelection,
+              let navigationController = viewController as? TabNavigationController else { return }
+
+        if navigationController.appTab == .orders {
+            badgeViewModel.refreshPendingWriteOffCount()
+        }
+    }
+}

suixinkan/UI/MainTab/TabNavigationController.swift

@@ -0,0 +1,73 @@
+//
+//  TabNavigationController.swift
+//  suixinkan
+//
+
+import UIKit
+
+/// 单个 Tab 的导航栈。
+final class TabNavigationController: UINavigationController {
+
+    let appTab: AppTab
+
+    init(tab: AppTab) {
+        self.appTab = tab
+        super.init(nibName: nil, bundle: nil)
+        delegate = self
+        navigationBar.prefersLargeTitles = false
+        setViewControllers([tab.makeRootViewController()], animated: false)
+    }
+
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
+        viewController.hidesBottomBarWhenPushed = viewControllers.count > 0
+        updateNavigationBarVisibility(for: viewController, animated: animated)
+        super.pushViewController(viewController, animated: animated)
+    }
+
+    override func setViewControllers(_ viewControllers: [UIViewController], animated: Bool) {
+        if let topViewController = viewControllers.last {
+            updateNavigationBarVisibility(for: topViewController, animated: animated)
+        }
+        super.setViewControllers(viewControllers, animated: animated)
+    }
+
+    override func popViewController(animated: Bool) -> UIViewController? {
+        let poppedViewController = super.popViewController(animated: animated)
+        if !animated, let topViewController {
+            updateNavigationBarVisibility(for: topViewController, animated: false)
+        }
+        return poppedViewController
+    }
+
+    override func popToRootViewController(animated: Bool) -> [UIViewController]? {
+        let poppedViewControllers = super.popToRootViewController(animated: animated)
+        if !animated, let topViewController {
+            updateNavigationBarVisibility(for: topViewController, animated: false)
+        }
+        return poppedViewControllers
+    }
+
+    private func shouldHideNavigationBar(for viewController: UIViewController) -> Bool {
+        viewController is HomeViewController
+    }
+
+    private func updateNavigationBarVisibility(for viewController: UIViewController, animated: Bool) {
+        setNavigationBarHidden(shouldHideNavigationBar(for: viewController), animated: animated)
+    }
+}
+
+extension TabNavigationController: UINavigationControllerDelegate {
+
+    func navigationController(
+        _ navigationController: UINavigationController,
+        willShow viewController: UIViewController,
+        animated: Bool
+    ) {
+        updateNavigationBarVisibility(for: viewController, animated: animated)
+    }
+}

suixinkan/UI/Orders/OrdersViewController.swift

@@ -0,0 +1,28 @@
+//
+//  OrdersViewController.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 订单 Tab 根页面。
+final class OrdersViewController: BaseViewController {
+
+    private let titleLabel = UILabel()
+
+    override func setupUI() {
+        title = "订单"
+        titleLabel.text = "订单"
+        titleLabel.font = .systemFont(ofSize: 24, weight: .medium)
+        titleLabel.textAlignment = .center
+        titleLabel.textColor = AppColor.text333
+        view.addSubview(titleLabel)
+    }
+
+    override func setupConstraints() {
+        titleLabel.snp.makeConstraints { make in
+            make.center.equalToSuperview()
+        }
+    }
+}

suixinkan/UI/Profile/ProfileViewController.swift

@@ -0,0 +1,28 @@
+//
+//  ProfileViewController.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 我的 Tab 根页面。
+final class ProfileViewController: BaseViewController {
+
+    private let titleLabel = UILabel()
+
+    override func setupUI() {
+        title = "我的"
+        titleLabel.text = "我的"
+        titleLabel.font = .systemFont(ofSize: 24, weight: .medium)
+        titleLabel.textAlignment = .center
+        titleLabel.textColor = AppColor.text333
+        view.addSubview(titleLabel)
+    }
+
+    override func setupConstraints() {
+        titleLabel.snp.makeConstraints { make in
+            make.center.equalToSuperview()
+        }
+    }
+}

suixinkan/UI/Scan/ScanPlaceholderViewController.swift

@@ -0,0 +1,50 @@
+//
+//  ScanPlaceholderViewController.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 扫码核销占位页，后续替换为真实扫码页。
+final class ScanPlaceholderViewController: BaseViewController {
+
+    private let titleLabel = UILabel()
+    private let closeButton = UIButton(type: .system)
+
+    override func setupNavigationBar() {
+        navigationController?.setNavigationBarHidden(true, animated: false)
+    }
+
+    override func setupUI() {
+        view.backgroundColor = .black
+
+        titleLabel.text = "扫码核销"
+        titleLabel.font = .systemFont(ofSize: 20, weight: .medium)
+        titleLabel.textColor = .white
+        titleLabel.textAlignment = .center
+
+        closeButton.setTitle("关闭", for: .normal)
+        closeButton.setTitleColor(.white, for: .normal)
+        closeButton.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
+        closeButton.addTarget(self, action: #selector(closeTapped), for: .touchUpInside)
+
+        view.addSubview(titleLabel)
+        view.addSubview(closeButton)
+    }
+
+    override func setupConstraints() {
+        titleLabel.snp.makeConstraints { make in
+            make.center.equalToSuperview()
+        }
+
+        closeButton.snp.makeConstraints { make in
+            make.top.equalTo(view.safeAreaLayoutGuide).offset(12)
+            make.trailing.equalToSuperview().inset(16)
+        }
+    }
+
+    @objc private func closeTapped() {
+        dismiss(animated: true)
+    }
+}

suixinkan/UI/Statistics/StatisticsViewController.swift

@@ -0,0 +1,28 @@
+//
+//  StatisticsViewController.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 数据 Tab 根页面。
+final class StatisticsViewController: BaseViewController {
+
+    private let titleLabel = UILabel()
+
+    override func setupUI() {
+        title = "数据"
+        titleLabel.text = "数据"
+        titleLabel.font = .systemFont(ofSize: 24, weight: .medium)
+        titleLabel.textAlignment = .center
+        titleLabel.textColor = AppColor.text333
+        view.addSubview(titleLabel)
+    }
+
+    override func setupConstraints() {
+        titleLabel.snp.makeConstraints { make in
+            make.center.equalToSuperview()
+        }
+    }
+}