D32 - 用 Swift 和公开资讯，打造投资理财的 Apps { 台股申购功能扩充，算出价差.3 }

承上一篇，我打算在 App 的 didFinishLaunch 就发动拉取全台股上市日成交资料，并在拉取成功後存入 UserDefatuls。

先设立一个 UserDefaultsKey 的类别，进行 key 的管理。

import Foundation

struct UserDefaultsKey {
    
    static var twAllMarketDayPrice: String {
        return "twAllMarketDayPrice"
    }
}

然後在 AppDelegate 加上存入 day price tick 的 func。整个 AppDelegate 程序码如下。

import UIKit

@main
class AppDelegate: UIResponder, UIApplicationDelegate {
    
    private lazy var stockDayPriceManager: StockDayPriceManager = {
        return StockDayPriceManager()
    }()

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        
        stockDayPriceManager.getAllTwMarketStockDayPrice { [weak self] result in
            switch result {
            case .success(let ticks):
                self?.save(twAllMarketTicks: ticks)
            case .failure(let error):
                print("fetch all tw market stock day price got error: \(error.localizedDescription)")
            }
        }
        
        return true
    }

    // MARK: UISceneSession Lifecycle

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }

    private func save(twAllMarketTicks: [StockDayTick]) {
        
        if let data = try? JSONEncoder().encode(twAllMarketTicks) {
            let key = UserDefaultsKey.twAllMarketDayPrice
            UserDefaults.standard.setValue(data, forKey: key)
        }
    }

}

但後来发现， StockDayPriceManager 的 AlamofireAdapter 最好存起来，如果单纯 init 使用，在 didFinishLaunch 的时候，在模拟器上跑， session 可能已经被回收了，导致下载档案失败

struct StockDayPriceManager {
    
    private var alamofireAdapter: AlamofireAdapter = {
        return AlamofireAdapter()
    }()
}

下一步，就是在申购页面，进行价差的计算。

台股申购日历
IT铁人赛Demo App

下方是这次 D1 ~ D12 的完成品，可以下载来试
App Store - 台股申购日历