feat: 과일의 재고가 바뀔 때 마다 화면에 반영되도록 기능 구현

- Notification.Name changedFruitStockNotification 추가
- FruitStore 타입 내부에 changeAmount 메서드에 Notification 발송 기능 추가
- JuiceMakerViewController 내부에 Label들을 업데이트 할 수 있도록 여러 메서드 추가

JuiceMaker/JuiceMaker/Controller/JuiceMakerViewController.swift

@@ -10,9 +10,62 @@ class JuiceMakerViewController: UIViewController {
 
  private let juiceMaker = JuiceMaker()
 
+ @IBOutlet weak var strawberryStock: UILabel!
+ @IBOutlet weak var bananaStock: UILabel!
+ @IBOutlet weak var pineappleStock: UILabel!
+ @IBOutlet weak var kiwiStock: UILabel!
+ @IBOutlet weak var mangoStock: UILabel!
+
+
  override func viewDidLoad() {
  super.viewDidLoad()
- // Do any additional setup after loading the view.
+ uploadStocks()
+
+ NotificationCenter.default.addObserver(self, selector: #selector(updateFruitStock(notification:)), name: .changedFruitStockNotification, object: nil)
+ }
+
+ func uploadStocks() {
+ currentStockLabel(fruit: .strawberry, label: strawberryStock)
+ currentStockLabel(fruit: .banana, label: bananaStock)
+ currentStockLabel(fruit: .pineapple, label: pineappleStock)
+ currentStockLabel(fruit: .kiwi, label: kiwiStock)
+ currentStockLabel(fruit: .mango, label: mangoStock)
+ }
+
+
+ func currentStockLabel(fruit: FruitStore.Fruit, label: UILabel) {
+ do {
+ let stock = try FruitStore.shared.stock(fruit: fruit)
+ label.text = String(stock)
+ } catch let error as RequestError {
+ notificationAlert(message: error.errorDescription)
+ } catch {
+ notificationAlert(message: "알 수 없는 에러가 발생했습니다.")
+ }
+ }
+
+ @objc func updateFruitStock(notification: Notification) {
+ // 수정된 과일과 과일의 재고갯수를 받아와서 label을 수정
+ guard let fruit = notification.object as? FruitStore.Fruit else {
+ notificationAlert(message: "알 수 없는 에러가 발생했습니다.")
+ return
+ }
+ currentStockLabel(fruit: fruit, label: fruitlabel(of: fruit))
+ }
+
+ func fruitlabel(of fruit: FruitStore.Fruit) -> UILabel {
+ switch fruit {
+ case .strawberry:
+ return strawberryStock
+ case .banana:
+ return bananaStock
+ case .pineapple:
+ return pineappleStock
+ case .kiwi:
+ return kiwiStock
+ case .mango:
+ return mangoStock
+ }
  }
 
  @IBAction func orderJuiceButtonTapped(_ sender: UIButton) {
@@ -41,6 +94,7 @@ class JuiceMakerViewController: UIViewController {
 
  do {
  try juiceMaker.mixFruit(juice: juice)
+ notificationAlert(message: "\(juice) 쥬스 나왔습니다! 맛있게 드세요!")
  } catch RequestError.fruitStockOut {
  outOfStockAlert()
  } catch let error as RequestError {

JuiceMaker/JuiceMaker/Model/FruitStore.swift

@@ -29,6 +29,13 @@ class FruitStore {
  self.fruitBasket = Dictionary(uniqueKeysWithValues: zip(allFruits, fruitscount))
  }
 
+ func stock(fruit: Fruit) throws -> Int {
+ guard let fruitStock = fruitBasket[fruit] else {
+ throw RequestError.fruitNotFound
+ }
+ return fruitStock
+ }
+
  func addFruitStock(fruit: Fruit, count: Int) throws {
  try changeAmount(count: count, of: fruit, by: +)
  }
@@ -49,6 +56,8 @@ class FruitStore {
  }
  let newFruitCount = calculator(oldFruitCount, count)
  fruitBasket[fruit] = newFruitCount
+
+ NotificationCenter.default.post(name: .changedFruitStockNotification, object: fruit)
  }
 
  func hasFruitStock(of fruit: Fruit, count fruitCountSubtracted: Int) -> Bool {
@@ -58,3 +67,6 @@ class FruitStore {
 }
 
 
+extension Notification.Name {
+ static let changedFruitStockNotification = Notification.Name("changeFruitStock")
+}

JuiceMaker/JuiceMaker/View/Base.lproj/Main.storyboard

@@ -243,6 +243,13 @@
  </connections>
  </barButtonItem>
  </navigationItem>
+ <connections>
+ <outlet property="bananaStock" destination="gvk-pA-Lw5" id="I4h-3W-xpD"/>
+ <outlet property="kiwiStock" destination="FZq-de-TJG" id="yU2-Ay-SC3"/>
+ <outlet property="mangoStock" destination="3Ce-SU-JeH" id="eXr-g0-l78"/>
+ <outlet property="pineappleStock" destination="ccQ-Dk-PuY" id="lFl-eM-TyK"/>
+ <outlet property="strawberryStock" destination="Qas-vP-td6" id="wPb-it-h37"/>
+ </connections>
  </viewController>
  <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
  </objects>