Initial commit: suixinkan_ios UIKit rewrite project.

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

suixinkan_ios/Features/Tasks/ViewModels/TaskCloudFileSelectionViewModel.swift

@@ -0,0 +1,138 @@
+//
+//  TaskCloudFileSelectionViewModel.swift
+//  suixinkan
+//
+//  Created by Codex on 2026/6/23.
+//
+
+import Foundation
+
+/// 云盘文件类型筛选实体，表示发布任务选择附件时的过滤方式。
+enum TaskCloudFileFilter: Int, CaseIterable, Identifiable {
+    case all = 0
+    case video = 1
+    case image = 2
+
+    var id: Int { rawValue }
+
+    /// 返回筛选项展示文案。
+    var title: String {
+        switch self {
+        case .all:
+            "全部"
+        case .video:
+            "视频"
+        case .image:
+            "图片"
+        }
+    }
+}
+
+/// 云盘文件选择 ViewModel，负责目录浏览、筛选、分页和附件选择。
+@MainActor
+final class TaskCloudFileSelectionViewModel {
+    var onChange: (() -> Void)?
+    var path: [CloudDriveFile] = [CloudDriveFile(id: 0, name: "云盘")] { didSet { onChange?() } }
+    var files: [CloudDriveFile] = [] { didSet { onChange?() } }
+    var total = 0 { didSet { onChange?() } }
+    var page = 1 { didSet { onChange?() } }
+    var searchText = "" { didSet { onChange?() } }
+    var selectedFilter: TaskCloudFileFilter = .all { didSet { onChange?() } }
+    var selectedFiles: [CloudDriveFile] = [] { didSet { onChange?() } }
+    var isLoading = false { didSet { onChange?() } }
+    var isLoadingMore = false { didSet { onChange?() } }
+    var errorMessage: String? { didSet { onChange?() } }
+
+    private let pageSize = 20
+
+    /// 当前目录 ID。
+    var currentFolderId: Int {
+        path.last?.id ?? 0
+    }
+
+    /// 判断当前目录是否还有下一页。
+    var hasMore: Bool {
+        files.count < total
+    }
+
+    /// 重新加载当前目录第一页。
+    func reload(api: any TaskServing) async throws {
+        isLoading = true
+        errorMessage = nil
+        defer { isLoading = false }
+
+        do {
+            let payload = try await requestFiles(api: api, page: 1)
+            page = 1
+            files = payload.list
+            total = payload.total
+        } catch {
+            files = []
+            total = 0
+            page = 1
+            errorMessage = error.localizedDescription
+            throw error
+        }
+    }
+
+    /// 加载当前目录下一页。
+    func loadMore(api: any TaskServing) async throws {
+        guard hasMore, !isLoadingMore else { return }
+        isLoadingMore = true
+        defer { isLoadingMore = false }
+
+        let nextPage = page + 1
+        let payload = try await requestFiles(api: api, page: nextPage)
+        page = nextPage
+        total = payload.total
+        files.append(contentsOf: payload.list)
+    }
+
+    /// 进入指定文件夹并刷新列表。
+    func enterFolder(_ folder: CloudDriveFile, api: any TaskServing) async throws {
+        guard folder.isFolder else { return }
+        path.append(folder)
+        try await reload(api: api)
+    }
+
+    /// 回到指定面包屑目录并刷新列表。
+    func popToFolder(at index: Int, api: any TaskServing) async throws {
+        guard path.indices.contains(index) else { return }
+        path = Array(path.prefix(index + 1))
+        try await reload(api: api)
+    }
+
+    /// 切换文件选中状态，文件夹不会被选为附件。
+    func toggleSelection(_ file: CloudDriveFile) {
+        guard !file.isFolder else { return }
+        if let index = selectedFiles.firstIndex(where: { $0.id == file.id }) {
+            selectedFiles.remove(at: index)
+        } else {
+            selectedFiles.append(file)
+        }
+    }
+
+    /// 判断指定云盘文件是否已选中。
+    func isSelected(_ file: CloudDriveFile) -> Bool {
+        selectedFiles.contains { $0.id == file.id }
+    }
+
+    /// 将当前选中的云盘文件转换为发布任务表单附件。
+    func makeSelectionItems() -> [TaskCloudSelectionItem] {
+        selectedFiles.map {
+            TaskCloudSelectionItem(id: $0.id, fileName: $0.name, fileType: $0.type, remark: "")
+        }
+    }
+
+    /// 组装并发送云盘文件列表请求。
+    private func requestFiles(api: any TaskServing, page: Int) async throws -> ListPayload<CloudDriveFile> {
+        try await api.cloudFileList(
+            parentFolderId: currentFolderId,
+            name: searchText.trimmingCharacters(in: .whitespacesAndNewlines),
+            type: selectedFilter.rawValue,
+            orderBy: 2,
+            page: page,
+            pageSize: pageSize
+        )
+    }
+}