[feat] 코어데이터 로딩 오류 시 나타나는 에러 뷰 컨트롤러에 디버깅용 문구 추가 #163

코어데이터 오류 시 디버깅용 문구를 저장 관련 작업 실패 시에만 추가하고,
앱 실행 시 발생할 수 있는 초기 오류에는 추가하지 않아서 추가함

Happiggy-bank/Happiggy-bank/CoreData/PersistenceStore.swift

@@ -20,7 +20,7 @@ class PersistenceStore {
         PersistenceStore(name: StringLiteral.sharedPersistenceStoreName)
     }()
 
-    static private(set) var fatalErrorNeeded = false
+    static private(set) var fatalErrorDescription: String?
 
     /// persistence container 의 viewContext 에 접근하기 위한 syntactic sugar
     private(set) lazy var context: NSManagedObjectContext = {
@@ -43,7 +43,10 @@ class PersistenceStore {
         self.persistentContainer = NSPersistentContainer(name: name).then {
             $0.loadPersistentStores { _, error in
                 if let error = error as NSError? {
-                    PersistenceStore.fatalErrorNeeded = true
+                    PersistenceStore.fatalErrorDescription = """
+                    \(error.localizedDescription)
+                    \(error.userInfo)
+                """
                     print(error.localizedDescription)
                     print(error.userInfo)
                 }

Happiggy-bank/Happiggy-bank/SceneDelegate.swift

@@ -19,12 +19,14 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         guard let scene = (scene as? UIWindowScene)
         else { return }
 
-        guard PersistenceStore.fatalErrorNeeded == false
+        guard let errorMessage = PersistenceStore.fatalErrorDescription
         else {
-            scene.windows.first?.rootViewController = ErrorViewController()
+            /// 정상적인 경우
+            PersistenceStore.shared.windowScene = scene
             return
         }
-        PersistenceStore.shared.windowScene = scene
+        /// 코어데이터 에러 발생
+        scene.windows.first?.rootViewController = ErrorViewController(errorMessage: errorMessage)
     }
 
     func sceneDidDisconnect(_ scene: UIScene) {

Happiggy-bank/Happiggy-bank/Utils/Constants.swift

@@ -1174,6 +1174,24 @@ let mainStoryboardName = "Main"
 
 extension ErrorViewController {
 
+    /// 상수
+    enum Metric {
+
+        /// 상하좌우 패딩 (24, -24, 24, -24)
+        static let paddings = (
+            top: edgeInset,
+            bottom: -edgeInset,
+            leading: edgeInset,
+            trailing: -edgeInset
+        )
+
+        /// 뷰 간 간격: 16
+        static let spacing: CGFloat = 24
+
+        /// 패딩: 24
+        private static let edgeInset: CGFloat = 24
+    }
+
     /// 문자열
     enum StringLiteral {
 

Happiggy-bank/Happiggy-bank/ViewController/ErrorViewController.swift

@@ -10,13 +10,37 @@ import UIKit
 /// 코어데이터 로딩 오류 발생 시 나타나는 뷰 컨트롤러
 final class ErrorViewController: UIViewController {
 
+    // MARK: - Properties
+
+    /// 에러메시지
+    private var errorMessage: String!
+
+    /// 유저에게 에러와 메일 주소를 안내하는 라벨
+    private var informationLabel: UILabel!
+
+    /// 디버깅용 문구를 나타내는 텍스트뷰
+    private var errorMessageTextView: UITextView!
+
+
+    // MARK: - Inits
+
+    init(errorMessage: String) {
+        super.init(nibName: nil, bundle: nil)
+        self.errorMessage = errorMessage
+    }
+
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+    }
+
+
     // MARK: - Life Cycle
 
     override func viewDidLoad() {
         super.viewDidLoad()
 
-        self.view.backgroundColor = .systemBackground
-        self.configureInformationLabel()
+        self.configureView()
+        self.configureViewHierarchy()
     }
 
 
@@ -30,26 +54,79 @@ final class ErrorViewController: UIViewController {
 
     // MARK: - Functions
 
+    /// 뷰 초기설정
+    private func configureView() {
+        self.view.backgroundColor = .systemBackground
+        self.view.addGestureRecognizer(UITapGestureRecognizer(
+            target: self,
+            action: #selector(userDidTap(sender:))
+        ))
+        self.configureInformationLabel()
+        self.configureErrorMessageTextView()
+    }
+
     /// 에러 안내 라벨 생성
     private func configureInformationLabel() {
 
-        let informationLabel = UILabel().then {
+        self.informationLabel = UILabel().then {
             $0.textColor = .customWarningLabel
             $0.numberOfLines = .zero
             $0.textAlignment = .center
             $0.text = StringLiteral.informationLabelText
             $0.translatesAutoresizingMaskIntoConstraints = false
         }
-
-        self.view.addSubview(informationLabel)
+    }
+
+    /// 텍스트뷰 초기 설정
+    private func configureErrorMessageTextView() {
+        self.errorMessageTextView = UITextView().then {
+            $0.textColor = .label
+            $0.font = UIFont.systemFont(ofSize: UIFont.labelFontSize)
+            $0.isEditable = false
+            $0.showsHorizontalScrollIndicator = false
+            $0.text = self.errorMessage
+            $0.translatesAutoresizingMaskIntoConstraints = false
+        }
+    }
+
+    /// 뷰 체계 구성
+    private func configureViewHierarchy() {
+        self.view.addSubview(self.informationLabel)
+        self.view.addSubview(self.errorMessageTextView)
+        self.configureInformationLabelConstraints()
+        self.configureErrorMessageTextViewConstraints()
+    }
+
+    /// 정보 라벨 오토레이아웃 설정
+    private func configureInformationLabelConstraints() {
         NSLayoutConstraint.activate([
-            informationLabel.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
-            informationLabel.centerYAnchor.constraint(equalTo: self.view.centerYAnchor)
+            self.informationLabel.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
+            self.informationLabel.topAnchor.constraint(
+                equalTo: self.view.safeAreaLayoutGuide.topAnchor,
+                constant: Metric.paddings.top
+            )
+        ])
+    }
+
+    /// 에러 메시지 텍스트뷰 오토레이아웃 설정
+    private func configureErrorMessageTextViewConstraints() {
+        NSLayoutConstraint.activate([
+            self.errorMessageTextView.topAnchor.constraint(
+                equalTo: self.informationLabel.bottomAnchor,
+                constant: Metric.spacing
+            ),
+            self.errorMessageTextView.bottomAnchor.constraint(
+                equalTo: self.view.safeAreaLayoutGuide.bottomAnchor,
+                constant: Metric.paddings.bottom
+            ),
+            self.errorMessageTextView.leadingAnchor.constraint(
+                equalTo: self.view.leadingAnchor,
+                constant: Metric.paddings.leading
+            ),
+            self.errorMessageTextView.trailingAnchor.constraint(
+                equalTo: self.view.trailingAnchor,
+                constant: Metric.paddings.trailing
+            )
         ])
-
-        self.view.addGestureRecognizer(UITapGestureRecognizer(
-            target: self,
-            action: #selector(userDidTap(sender:))
-        ))
     }
 }