conditional approach

TaiwanReceiptLottery/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+</dict>
+</plist>

TaiwanReceiptLottery/Receipt.swift

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+//
+//  Receipt.swift
+//  TaiwanReceiptLottery
+//
+//  Created by Paul Lee on 2021/9/14.
+//
+
+import Foundation
+public struct Receipt {
+    public enum SpecialFieldBox {
+        case taxID(String)
+        case mobileBarCode(String)
+        case npoCode(String)
+        case non
+    }
+
+    let date: Date
+    let price: Int
+    let lotteryNumber: String
+    let specialField: SpecialFieldBox
+
+    public init(date: Date, price: Int, lotteryNumber: String, specialField: SpecialFieldBox) {
+        self.date = date
+        self.price = price
+        self.lotteryNumber = lotteryNumber
+        self.specialField = specialField
+    }
+}

TaiwanReceiptLottery/ReceiptViewModel.swift

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+//
+//  ReceiptViewModel.swift
+//  TaiwanReceiptLottery
+//
+//  Created by Paul Lee on 2021/9/14.
+//
+
+import Foundation
+public struct ReceiptViewModel {
+    let receipt: Receipt
+    public init(_ receipt: Receipt) {
+        self.receipt = receipt
+    }
+
+    public var title: String {
+        switch receipt.specialField {
+        case .taxID(let id):
+            return "A B2B receipt has been issued, the company tax id is \(id)."
+
+        case .mobileBarCode:
+            return "A B2C receipt has been issued."
+
+        case .npoCode:
+            return "A B2C receipt has been issued."
+
+        case .non:
+            return "A B2C receipt has been issued."
+        }
+    }
+
+    public var body: String {
+        return "The lottery number is \(receipt.lotteryNumber)."
+    }
+
+    public var footer: String {
+        switch receipt.specialField {
+        case .taxID:
+            return "You can choose to print out this receipt or send it to your customer through email."
+
+        case .mobileBarCode(let code):
+            return "The receipt is saved in cloud database with mobile barcode number: \(code)"
+
+        case .npoCode(let code):
+            return "The lottery opportunity has been donated to a non profit organization, the organization id is: \(code)"
+
+        case .non:
+            return "The receipt has been printed."
+        }
+    }
+}

TaiwanReceiptLottery/ReceiptViewModelsFactory.swift

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+//
+//  ReceiptViewModelsFactory.swift
+//  TaiwanReceiptLottery
+//
+//  Created by Paul Lee on 2021/9/14.
+//
+
+import Foundation
+public class ViewModelsFactory {
+    public static func makeViewModels(_ receipts: [Receipt]) -> [ReceiptViewModel] {
+        receipts.map { ReceiptViewModel($0) }
+    }
+}

TaiwanReceiptLottery/TaiwanReceiptLottery.h

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+//
+//  TaiwanReceiptLottery.h
+//  TaiwanReceiptLottery
+//
+//  Created by Paul Lee on 2021/9/14.
+//
+
+#import <Foundation/Foundation.h>
+
+//! Project version number for TaiwanReceiptLottery.
+FOUNDATION_EXPORT double TaiwanReceiptLotteryVersionNumber;
+
+//! Project version string for TaiwanReceiptLottery.
+FOUNDATION_EXPORT const unsigned char TaiwanReceiptLotteryVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <TaiwanReceiptLottery/PublicHeader.h>
+
+