Data Export Skill for Claude

Glob: **/*Export*.swift, **/*Import*.swift, **/*CSV*.swift, **/*PDF*.swift
Grep: "UIGraphicsPDFRenderer" or "CSVExport" or "UIActivityViewController" or "ShareLink" or "fileExporter"

Grep: "@Model" or "NSManagedObject" or "struct.*Codable" or "class.*Codable"

DataExport/
├── DataExportable.swift   # Protocol for exportable models
├── DataExportManager.swift # Central export coordinator
├── CSVExporter.swift       # CSV generation (optional)
├── PDFExporter.swift       # PDF rendering (optional)
└── DataImporter.swift      # File import (optional)

struct Expense: Codable, DataExportable {
    let id: UUID
    let title: String
    let amount: Double
    let date: Date
    let category: String

    // DataExportable conformance
    static var csvHeaders: [String] {
        ["ID", "Title", "Amount", "Date", "Category"]
    }

    var csvRow: [String] {
        [id.uuidString, title, String(format: "%.2f", amount),
         ISO8601DateFormatter().string(from: date), category]
    }

    var pdfDescription: String {
        "\(title) - $\(String(format: "%.2f", amount)) (\(category))"
    }
}

struct ExpenseListView: View {
    let expenses: [Expense]
    @State private var exportURL: URL?
    @State private var showShareSheet = false

    var body: some View {
        List(expenses) { expense in
            ExpenseRow(expense: expense)
        }
        .toolbar {
            Menu {
                Button("Export as JSON") {
                    Task { await exportAs(.json) }
                }
                Button("Export as CSV") {
                    Task { await exportAs(.csv) }
                }
                Button("Export as PDF") {
                    Task { await exportAs(.pdf) }
                }
            } label: {
                Label("Export", systemImage: "square.and.arrow.up")
            }
        }
        .sheet(isPresented: $showShareSheet) {
            if let exportURL {
                ShareSheet(activityItems: [exportURL])
            }
        }
    }

    private func exportAs(_ format: DataExportManager.ExportFormat) async {
        do {
            exportURL = try await DataExportManager.shared.export(
                expenses, format: format, filename: "expenses"
            )
            showShareSheet = true
        } catch {
            // Handle error
        }
    }
}

if let url = exportURL {
    ShareLink(item: url) {
        Label("Share Export", systemImage: "square.and.arrow.up")
    }
}

struct ImportView: View {
    @State private var showFilePicker = false
    @State private var importedItems: [Expense] = []

    var body: some View {
        Button("Import Data") { showFilePicker = true }
            .fileImporter(
                isPresented: $showFilePicker,
                allowedContentTypes: DataImporter.supportedTypes
            ) { result in
                Task {
                    let url = try result.get()
                    importedItems = try await DataImporter.importFile(
                        from: url, as: Expense.self
                    )
                }
            }
    }
}

func exportAllUserData() async throws -> URL {
    let allData = GDPRExportData(
        profile: try await fetchUserProfile(),
        expenses: try await fetchAllExpenses(),
        settings: try await fetchUserSettings(),
        exportDate: Date(),
        appVersion: Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "1.0"
    )

    let encoder = JSONEncoder()
    encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
    encoder.dateEncodingStrategy = .iso8601
    let data = try encoder.encode(allData)

    let url = FileManager.default.temporaryDirectory
        .appendingPathComponent("user-data-export.json")
    try data.write(to: url)
    return url
}

@Test
func jsonExportRoundTrip() async throws {
    let expenses = [
        Expense(id: UUID(), title: "Coffee", amount: 4.50,
                date: Date(), category: "Food")
    ]

    let url = try await DataExportManager.shared.export(
        expenses, format: .json, filename: "test"
    )
    let data = try Data(contentsOf: url)
    let decoded = try JSONDecoder().decode([Expense].self, from: data)

    #expect(decoded.count == 1)
    #expect(decoded.first?.title == "Coffee")
}

@Test
func csvExportFormatsCorrectly() {
    let expenses = [
        Expense(id: UUID(), title: "Coffee, Large", amount: 4.50,
                date: Date(), category: "Food")
    ]

    let csv = CSVExporter.generate(
        from: expenses,
        headers: Expense.csvHeaders,
        rowMapper: { $0.csvRow }
    )

    #expect(csv.contains("\"Coffee, Large\""))  // Commas escaped with quotes
    #expect(csv.hasPrefix("ID,Title,Amount,Date,Category"))
}

@Test
func importParsesCSV() async throws {
    let csvContent = "ID,Title,Amount\n1,Coffee,4.50\n2,Lunch,12.00"
    let url = FileManager.default.temporaryDirectory.appendingPathComponent("test.csv")
    try csvContent.write(to: url, atomically: true, encoding: .utf8)

    let rows = try CSVExporter.parse(from: url)
    #expect(rows.count == 2)
    #expect(rows.first?["Title"] == "Coffee")
}

let url = FileManager.default.temporaryDirectory
    .appendingPathComponent("export.\(format.fileExtension)")
try data.write(to: url)
// Present via UIActivityViewController or ShareLink