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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| // | ||
| // History.swift | ||
| // Calculator | ||
| // | ||
| // Created by Anthony Ingle on 5/1/22. | ||
| // | ||
|
|
||
| import Foundation | ||
| import SwiftUI | ||
|
|
||
| struct History: Identifiable, Codable { | ||
| let id: UUID | ||
| var date: Date | ||
| var expression: String | ||
| var solution: String | ||
|
|
||
| init(expression: String, solution: String) { | ||
| id = UUID() | ||
| date = .now | ||
| self.expression = expression | ||
| self.solution = solution | ||
| } | ||
| } | ||
|
|
||
| class HistoryStore : ObservableObject { | ||
| @Published var history: [History] = [] | ||
|
|
||
| private static func fileURL() throws -> URL { | ||
| try FileManager.default.url(for: .documentDirectory, | ||
| in: .userDomainMask, | ||
| appropriateFor: nil, | ||
| create: false) | ||
| .appendingPathComponent("history.data") | ||
| } | ||
|
|
||
| static func load(completion: @escaping (Result<[History], Error>) -> Void) { | ||
| DispatchQueue.global(qos: .background).async { | ||
| do { | ||
| let fileURL = try fileURL() | ||
| guard let file = try? FileHandle(forReadingFrom: fileURL) else { | ||
| DispatchQueue.main.async { | ||
| completion(.success([])) | ||
| } | ||
| return | ||
| } | ||
| let historyData = try JSONDecoder().decode([History].self, from: file.availableData) | ||
| DispatchQueue.main.async { | ||
| completion(.success(historyData)) | ||
| } | ||
| } catch { | ||
| DispatchQueue.main.async { | ||
| completion(.failure(error)) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| static func save(history: [History], completion: @escaping (Result<Int, Error>) -> Void) { | ||
| DispatchQueue.global(qos: .background).async { | ||
| do { | ||
| let data = try JSONEncoder().encode(history) | ||
| let outfile = try fileURL() | ||
| try data.write(to: outfile) | ||
| DispatchQueue.main.async { | ||
| completion(.success(history.count)) | ||
| } | ||
| } catch { | ||
| DispatchQueue.main.async { | ||
| completion(.failure(error)) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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