feat: add WeChat sharing and invite flow

suixinkan/Core/WeChat/WeChatManager.swift

@@ -0,0 +1,89 @@
+//
+//  WeChatManager.swift
+//  suixinkan
+//
+
+import Foundation
+import WechatOpenSDK
+
+/// 微信 SDK 生命周期与回调管理，负责注册、URL/Universal Link 回跳及分享结果分发。
+@MainActor
+final class WeChatManager: NSObject {
+    static let shared = WeChatManager()
+
+    /// 最近一次分享结果，便于调试或 UI 状态读取。
+    private(set) var lastShareResult: WeChatShareResult?
+
+    private var shareCompletion: ((WeChatShareResult) -> Void)?
+    private var isRegistered = false
+
+    private override init() {
+        super.init()
+    }
+
+    /// 向微信注册 AppID 与 Universal Link，应用启动时调用。
+    func registerIfNeeded() {
+        guard !isRegistered else { return }
+        guard WeChatConfig.validateUniversalLink(WeChatConfig.universalLink) else {
+            assertionFailure("WeChat Universal Link must use https and end with /")
+            return
+        }
+
+        isRegistered = WXApi.registerApp(WeChatConfig.appID, universalLink: WeChatConfig.universalLink)
+    }
+
+    /// 处理 URL Scheme 回调。
+    @discardableResult
+    func handleOpenURL(_ url: URL) -> Bool {
+        WXApi.handleOpen(url, delegate: self)
+    }
+
+    /// 处理 Universal Link 回调。
+    @discardableResult
+    func handleContinueUserActivity(_ userActivity: NSUserActivity) -> Bool {
+        WXApi.handleOpenUniversalLink(userActivity, delegate: self)
+    }
+
+    /// 发送分享请求到微信。
+    func sendShareRequest(_ request: SendMessageToWXReq, completion: ((WeChatShareResult) -> Void)? = nil) {
+        guard WXApi.isWXAppInstalled() else {
+            completion?(.notInstalled)
+            return
+        }
+        guard WXApi.isWXAppSupport() else {
+            completion?(.unsupported)
+            return
+        }
+
+        if let completion {
+            shareCompletion = completion
+        }
+
+        WXApi.send(request) { [weak self] success in
+            guard !success else { return }
+            Task { @MainActor in
+                self?.finishShare(with: .sendFailed(-1))
+            }
+        }
+    }
+
+    private func finishShare(with result: WeChatShareResult) {
+        lastShareResult = result
+        shareCompletion?(result)
+        shareCompletion = nil
+    }
+}
+
+extension WeChatManager: WXApiDelegate {
+    nonisolated func onReq(_ req: BaseReq) {
+        // 分享模块暂不处理来自微信的主动请求。
+    }
+
+    nonisolated func onResp(_ resp: BaseResp) {
+        guard let shareResp = resp as? SendMessageToWXResp else { return }
+        let result = WeChatShareResult.fromWXErrorCode(shareResp.errCode)
+        Task { @MainActor in
+            WeChatManager.shared.finishShare(with: result)
+        }
+    }
+}