[Work 46] 로그인 화면을 추가합니다.

WhereAreYou/WhereAreYou/Core/SceneDelegate.swift

@@ -14,10 +14,27 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
     func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
         guard let windowScene = (scene as? UIWindowScene) else { return }
         window = UIWindow(windowScene: windowScene)
-        window?.rootViewController = makeRootTabBarController()
+        window?.rootViewController = makeRootLoginViewController()
         window?.makeKeyAndVisible()
     }
 
+    private func makeRootLoginViewController() -> UIViewController {
+        let loginViewController = LoginViewController()
+        loginViewController.onAppleLoginTap = { [weak self] in
+            self?.switchToHome()
+        }
+        return loginViewController
+    }
+
+    private func switchToHome() {
+        guard let window else { return }
+        let tabBarController = makeRootTabBarController()
+
+        UIView.transition(with: window, duration: 0.3, options: .transitionCrossDissolve) {
+            window.rootViewController = tabBarController
+        }
+    }
+
     private func makeRootTabBarController() -> UITabBarController {
         let homeNav = UINavigationController(rootViewController: HomeViewController())
         homeNav.tabBarItem = UITabBarItem(
@@ -57,4 +74,3 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
     func sceneDidEnterBackground(_ scene: UIScene) { }
 
 }
-

WhereAreYou/WhereAreYou/Presentation/Login/AppleLoginButton.swift

@@ -0,0 +1,48 @@
+//
+//  AppleLoginButton.swift
+//  WhereAreYou
+//
+//  Created by 김성훈 on 8/21/26.
+//
+
+import UIKit
+import AuthenticationServices
+
+/// Apple 로그인 버튼 — HIG 표준 컴포넌트를 감싸는 얇은 래퍼
+final class AppleLoginButton: UIView {
+
+    var onTap: (() -> Void)?
+
+    private lazy var button: ASAuthorizationAppleIDButton = {
+        let button = ASAuthorizationAppleIDButton(type: .signIn, style: .black)
+        button.cornerRadius = 12
+        button.translatesAutoresizingMaskIntoConstraints = false
+        button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
+        return button
+    }()
+
+    init() {
+        super.init(frame: .zero)
+        translatesAutoresizingMaskIntoConstraints = false
+        setUpLayout()
+    }
+
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    private func setUpLayout() {
+        addSubview(button)
+        NSLayoutConstraint.activate([
+            button.topAnchor.constraint(equalTo: topAnchor),
+            button.leadingAnchor.constraint(equalTo: leadingAnchor),
+            button.trailingAnchor.constraint(equalTo: trailingAnchor),
+            button.bottomAnchor.constraint(equalTo: bottomAnchor)
+        ])
+    }
+
+    @objc private func buttonTapped() {
+        onTap?()
+    }
+
+}

WhereAreYou/WhereAreYou/Presentation/Login/LoginViewController.swift

@@ -0,0 +1,112 @@
+//
+//  LoginViewController.swift
+//  WhereAreYou
+//
+//  Created by 김성훈 on 8/21/26.
+//
+
+import UIKit
+
+/// 로그인 화면 — 앱 진입 시 최초로 표시되는 화면
+final class LoginViewController: UIViewController {
+
+    // MARK: - Properties
+
+    var onAppleLoginTap: (() -> Void)?
+
+    // MARK: - UI
+
+    private let backgroundImageView: UIImageView = {
+        let imageView = UIImageView(image: .loginBackground)
+        imageView.contentMode = .scaleAspectFill
+        imageView.clipsToBounds = true
+        imageView.translatesAutoresizingMaskIntoConstraints = false
+        return imageView
+    }()
+
+    private let logoImageView: UIImageView = {
+        let imageView = UIImageView(image: .logo)
+        imageView.contentMode = .scaleAspectFit
+        imageView.translatesAutoresizingMaskIntoConstraints = false
+        return imageView
+    }()
+
+    private let titleLabel: UILabel = {
+        let label = UILabel()
+        label.text = "어딘데"
+        label.font = .boldPreferredFont(forTextStyle: .title1)
+        label.textColor = .blue1
+        label.textAlignment = .center
+        label.adjustsFontForContentSizeCategory = true
+        label.translatesAutoresizingMaskIntoConstraints = false
+        return label
+    }()
+
+    private let subtitleLabel: UILabel = {
+        let label = UILabel()
+        label.text = "약속 장소로 가는 길, 함께 확인해요"
+        label.font = .preferredFont(forTextStyle: .subheadline)
+        label.textColor = .secondaryLabel
+        label.textAlignment = .center
+        label.translatesAutoresizingMaskIntoConstraints = false
+        return label
+    }()
+
+    private let appleLoginButton: AppleLoginButton = AppleLoginButton()
+
+    // MARK: - Life Cycle
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        setUpView()
+        setUpLayout()
+        setUpActions()
+    }
+
+    // MARK: - Set Up
+
+    private func setUpView() {
+        view.backgroundColor = .pointBackground
+    }
+
+    private func setUpLayout() {
+        view.addSubview(backgroundImageView)
+        view.addSubview(logoImageView)
+        view.addSubview(titleLabel)
+        view.addSubview(subtitleLabel)
+        view.addSubview(appleLoginButton)
+
+        NSLayoutConstraint.activate([
+            backgroundImageView.topAnchor.constraint(equalTo: view.topAnchor),
+            backgroundImageView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            backgroundImageView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            backgroundImageView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+
+            logoImageView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
+            logoImageView.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: -240),
+            logoImageView.widthAnchor.constraint(equalToConstant: 119),
+            logoImageView.heightAnchor.constraint(equalToConstant: 74),
+
+            titleLabel.topAnchor.constraint(equalTo: logoImageView.bottomAnchor, constant: 16),
+            titleLabel.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 24),
+            titleLabel.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -24),
+
+            subtitleLabel.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 8),
+            subtitleLabel.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 24),
+            subtitleLabel.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -24),
+
+            appleLoginButton.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 24),
+            appleLoginButton.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -24),
+            appleLoginButton.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -40),
+            appleLoginButton.heightAnchor.constraint(equalToConstant: 50)
+        ])
+    }
+
+    private func setUpActions() {
+        appleLoginButton.onTap = { [weak self] in
+            // TODO: Apple 로그인 인증 로직 연결 필요
+            self?.onAppleLoginTap?()
+        }
+    }
+
+}

WhereAreYou/WhereAreYou/Resource/Assets.xcassets/LoginBackground.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "loginBack.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}