Add base infrastructure and SPM dependencies for iOS development.

Integrate SnapKit and Kingfisher, add BaseViewController and NotificationName, and streamline AGENTS.md with Android-aligned conventions.

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

suixinkan/Base/BaseViewController.swift

@@ -0,0 +1,162 @@
+//
+//  BaseViewController.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 业务 ViewController 基类，提供统一的 UI 搭建流程与通用 UI 能力。
+class BaseViewController: UIViewController {
+
+    private var loadingOverlay: UIView?
+    private var loadingIndicator: UIActivityIndicatorView?
+
+    // MARK: - Lifecycle
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        view.backgroundColor = .systemBackground
+        setupNavigationBar()
+        setupUI()
+        setupConstraints()
+        bindActions()
+        registerBaseNotifications()
+    }
+
+    deinit {
+        NotificationCenter.default.removeObserver(self)
+    }
+
+    // MARK: - Template Methods
+
+    /// 配置导航栏，子类按需重写。
+    func setupNavigationBar() {}
+
+    /// 创建并添加子视图。
+    func setupUI() {}
+
+    /// 使用 SnapKit 设置约束。
+    func setupConstraints() {}
+
+    /// 绑定 target-action、delegate 等交互。
+    func bindActions() {}
+
+    /// Token 失效时回调，子类可重写处理跳转登录等逻辑。
+    func onSessionDidExpire() {}
+
+    // MARK: - Loading
+
+    func showLoading() {
+        if loadingOverlay == nil {
+            let overlay = UIView()
+            overlay.backgroundColor = UIColor.black.withAlphaComponent(0.1)
+
+            let indicator = UIActivityIndicatorView(style: .large)
+            indicator.hidesWhenStopped = true
+
+            view.addSubview(overlay)
+            overlay.addSubview(indicator)
+
+            overlay.snp.makeConstraints { make in
+                make.edges.equalToSuperview()
+            }
+            indicator.snp.makeConstraints { make in
+                make.center.equalToSuperview()
+            }
+
+            loadingOverlay = overlay
+            loadingIndicator = indicator
+        }
+
+        loadingOverlay?.isHidden = false
+        loadingIndicator?.startAnimating()
+        view.bringSubviewToFront(loadingOverlay!)
+    }
+
+    func hideLoading() {
+        loadingIndicator?.stopAnimating()
+        loadingOverlay?.isHidden = true
+    }
+
+    // MARK: - Toast / Alert
+
+    func showToast(_ message: String, duration: TimeInterval = 2.0) {
+        guard !message.isEmpty else { return }
+
+        let container = UIView()
+        container.backgroundColor = UIColor.black.withAlphaComponent(0.8)
+        container.layer.cornerRadius = 8
+        container.clipsToBounds = true
+        container.alpha = 0
+
+        let label = UILabel()
+        label.text = message
+        label.textColor = .white
+        label.font = .systemFont(ofSize: 14)
+        label.textAlignment = .center
+        label.numberOfLines = 0
+
+        container.addSubview(label)
+        view.addSubview(container)
+
+        label.snp.makeConstraints { make in
+            make.edges.equalToSuperview().inset(UIEdgeInsets(top: 10, left: 16, bottom: 10, right: 16))
+        }
+        container.snp.makeConstraints { make in
+            make.centerX.equalToSuperview()
+            make.bottom.equalTo(view.safeAreaLayoutGuide).offset(-32)
+            make.leading.greaterThanOrEqualToSuperview().offset(32)
+            make.trailing.lessThanOrEqualToSuperview().offset(-32)
+        }
+
+        UIView.animate(withDuration: 0.25) {
+            container.alpha = 1
+        } completion: { _ in
+            UIView.animate(withDuration: 0.25, delay: duration) {
+                container.alpha = 0
+            } completion: { _ in
+                container.removeFromSuperview()
+            }
+        }
+    }
+
+    func showError(_ message: String) {
+        showToast(message)
+    }
+
+    func showAlert(
+        title: String?,
+        message: String?,
+        confirmTitle: String = "确定",
+        confirmHandler: (() -> Void)? = nil
+    ) {
+        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
+        alert.addAction(UIAlertAction(title: confirmTitle, style: .default) { _ in
+            confirmHandler?()
+        })
+        present(alert, animated: true)
+    }
+
+    // MARK: - Navigation
+
+    func popViewController() {
+        navigationController?.popViewController(animated: true)
+    }
+
+    // MARK: - Notifications
+
+    private func registerBaseNotifications() {
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handleSessionDidExpireNotification),
+            name: NotificationName.sessionDidExpire,
+            object: nil
+        )
+    }
+
+    @objc private func handleSessionDidExpireNotification() {
+        hideLoading()
+        onSessionDidExpire()
+    }
+}