[NL-89]: 온보딩 back button 이벤트 연결 (#67)

Author: TTOzzi

Feature/Onboarding/Sources/Onboarding/OnboardingViewModel.swift

@@ -15,6 +15,7 @@ import Lib
 public class OnboardingViewModel {
 
   enum Input {
+    case backButtonTap
     case checkNameFormat(name: String)
     case genderSelected(isSelected: GenderType)
     case checkBirthFormat(birth: String)
@@ -30,6 +31,7 @@ public class OnboardingViewModel {
     let isNextButtonEnabled: PassthroughSubject<Bool, Never> = .init()
     let isBornTimeButtonEnabled: PassthroughSubject<Bool, Never> = .init()
     let navigate: PassthroughSubject<OnboardingRoute, Never> = .init()
+    let back: PassthroughSubject<Void, Never> = .init()
   }
 
   let output: Output = Output()
@@ -46,6 +48,8 @@ public class OnboardingViewModel {
 
   func send(input: Input) {
     switch input {
+    case .backButtonTap:
+      self.output.back.send(())
     case .checkNameFormat(let name):
       self._isNameValid = checkNameFormat(name: name)
       if self._isNameValid { self.state.name = name }

Feature/Onboarding/Sources/Onboarding/OnboardingViewcontroller.swift

@@ -183,10 +183,9 @@ public final class OnboardingViewController: BaseViewController {
   override public func viewDidLoad() {
     super.viewDidLoad()
     self.view.backgroundColor = .white
-    let backButtonItem = NaivgationBarButtonItem.back
-    self.setNavigationBarLeftButtonItems(items: [backButtonItem])
     setupBind()
     setupHierarchy()
+    setupNavigationBar()
     setupLayout()
     setupDelegate()
     setupKeyboardObservers()
@@ -227,6 +226,16 @@ extension OnboardingViewController {
     self.bornTimeStack.addArrangedSubview(bornTimeSetButton)
     self.bornTimeStack.addArrangedSubview(dontKnowButton)
   }
+  
+  private func setupNavigationBar() {
+    let backButtonItem = NaivgationBarButtonItem.back
+    backButtonItem.tapPublisher
+      .sink { [weak self] _ in
+        self?.viewModel.send(input: .backButtonTap)
+      }
+      .store(in: &cancellables)
+    setNavigationBarLeftButtonItems(items: [backButtonItem])
+  }
 
   private func setupDelegate() {
     nameTextField.delegate = self
@@ -236,6 +245,12 @@ extension OnboardingViewController {
   }
 
   private func setupBind() {
+    viewModel.output.back
+      .receive(on: DispatchQueue.main)
+      .sink { [weak self] _ in
+        self?.navigationController?.popViewController(animated: true)
+      }
+      .store(in: &cancellables)
 
     viewModel.output.isNextButtonEnabled
       .receive(on: RunLoop.main)