[Refactor] #520 - DateFormatter() 인스턴스 메모리 최적화

SOPT-iOS/Projects/Core/Sources/Enum/DateFormatType.swift

@@ -0,0 +1,25 @@
+//
+//  DateFormatType.swift
+//  Core
+//
+//  Created by 강윤서 on 3/27/25.
+//  Copyright © 2025 SOPT-iOS. All rights reserved.
+//
+
+import Foundation
+
+public enum DateFormatType: String {
+    case iso = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
+    case isoWithoutMillis = "yyyy-MM-dd'T'HH:mm:ss"
+    case dateTimeDash = "yyyy-MM-dd HH:mm:ss"
+    case dateWithDot = "yyyy.MM.dd"
+    case dateWithDash = "yyyy-MM-dd"
+    case dateWithSlash = "yy/MM/dd"
+    case monthDayWeek = "M월 d일 EEEE"
+    case monthDayWeekTime = "M월 d일 EEEE H:mm"
+    case monthDayWeekFullTime = "M월 d일 EEEE HH:mm"
+    case monthDayWithDot = "MM.dd"
+    case monthDayWIthDash = "MM-dd"
+    case time = "HH:mm"
+    case networkLogger = "dd/MM/yyyy HH:mm:ss"
+}

SOPT-iOS/Projects/Core/Sources/Extension/Foundation+/String+.swift

@@ -19,10 +19,8 @@ public extension String {
 
     /// 서버에서 들어온 Date String을 Date 타입으로 반환하는 메서드
     func toDate() -> Date {
-        let dateFormatter = DateFormatter()
-        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
-        dateFormatter.timeZone = TimeZone(identifier: "KST")
-        if let date = dateFormatter.date(from: self) {
+        DateFormatManager.shared.setFormat(.iso)
+        if let date = DateFormatManager.shared.stringToDate(self) {
             return date
         } else {
             print("toDate() convert error")
@@ -38,8 +36,7 @@ public extension String {
 
     /// 서버에서 들어온 Date String을 UI에 적용 가능한 String 타입으로 반환하는 메서드
     func serverTimeToString(forUse: TimeStringCase) -> String {
-        let dateFormatter = DateFormatter()
-        dateFormatter.dateFormat = "yy/MM/dd"
+        DateFormatManager.shared.setFormat(.dateWithSlash)
 
         let currentTime = Int(Date().timeIntervalSince1970)
 
@@ -61,7 +58,7 @@ public extension String {
                 return "방금"
             }
         case .forDefault:
-            return dateFormatter.string(from: self.toDate())
+            return DateFormatManager.shared.dateToString(self.toDate())
         }
     }
 

SOPT-iOS/Projects/Core/Sources/Utils/DateFormatterManager.swift

@@ -0,0 +1,77 @@
+//
+//  DateFormatterManager.swift
+//  Core
+//
+//  Created by 강윤서 on 3/27/25.
+//  Copyright © 2025 SOPT-iOS. All rights reserved.
+//
+
+import Foundation
+
+public final class DateFormatManager {
+    public static let shared = DateFormatManager()
+
+    private init() {
+        formatter.locale = Locale(identifier: "ko_KR")
+        formatter.timeZone = TimeZone(identifier: "Asia/Seoul")
+    }
+
+    private var formatter = DateFormatter()
+}
+
+public extension DateFormatManager {
+    func setFormat(_ format: DateFormatType) {
+        formatter.dateFormat = format.rawValue
+    }
+
+    /// 문자열을 원하는 포맷의 Date타입으로 변환
+    func stringToDate(_ value: String) -> Date? {
+        return formatter.date(from: value)
+    }
+
+    /// date타입을 원하는 포맷의 문자열로 변환
+    func dateToString(_ date: Date) -> String {
+        return formatter.string(from: date)
+    }
+
+    /// 문자열 날짜를 원하는 포맷의 String타입으로 변환
+    /// 변경할 값이 비어있다면 오늘 날짜를 반환
+    func transformDateFormat(_ target: String? = nil, from before: DateFormatType? = nil, to after: DateFormatType) -> String {
+        guard let target, let before
+        else {
+            setFormat(after)
+            return dateToString(Date())
+        }
+
+        setFormat(before)
+        guard let date = stringToDate(target) else { return "00:00" }
+
+        setFormat(after)
+        return formatter.string(from: date)
+    }
+
+    /// 서버에서 내려주는 iSO 포맷 타입을 원하는 타입으로 변환
+    func serverTimeToString(_ target: String, from format: DateFormatType, to serverFormat: DateFormatType = .iso) -> String {
+        setFormat(serverFormat)
+        guard let date = stringToDate(target) else { return "" }
+
+        setFormat(format)
+        return dateToString(date)
+    }
+
+    /// 시작 날짜와 종료 날짜 입력 받아 원하는 포맷으로 변경 후 문자열로 반환
+    func formatTimeInterval(start: String, end: String) -> String {
+        setFormat(.monthDayWeekFullTime)
+
+        guard let startDate = stringToDate(start),
+              let endDate = stringToDate(end)
+        else { return "" }
+
+        let startString = dateToString(startDate)
+
+        setFormat(.time)
+        let endString = dateToString(endDate)
+
+        return "\(startString) ~ \(endString)"
+    }
+}

SOPT-iOS/Projects/Data/Sources/Transform/AttendanceScheduleTransform.swift

@@ -30,9 +30,8 @@ extension TodayAttendance {
 
     public func toDomain() -> TodayAttendanceModel {
         return .init(status: self.status,
-                     attendedAt: setDateFormat(
-                        date: self.attendedAt,
-                        from:  "yyyy-MM-dd'T'HH:mm:ss",
-                        to: "HH:mm"))
+                     attendedAt: DateFormatManager.shared.transformDateFormat(self.attendedAt,
+                                                                           from: .dateTimeDash,
+                                                                           to: .time))
     }
 }

SOPT-iOS/Projects/Features/AttendanceFeature/Sources/ShowAttendanceScene/VC/ShowAttendanceVC.swift

@@ -286,8 +286,7 @@ extension ShowAttendanceVC {
     private func setScheduledData(_ model: AttendanceScheduleModel) {
 
         if self.sceneType == .scheduledDay {
-            let date = viewModel.formatTimeInterval(startDate: model.startDate,
-                                                    endDate: model.endDate)
+            let date = DateFormatManager.shared.formatTimeInterval(start: model.startDate, end: model.endDate)
             headerScheduleView.setData(date: date,
                                        place: model.location,
                                        todaySchedule: model.name,

SOPT-iOS/Projects/Features/AttendanceFeature/Sources/ShowAttendanceScene/ViewModel/ShowAttendanceViewModel.swift

@@ -91,9 +91,12 @@ extension ShowAttendanceViewModel {
                 if model.type != SessionType.noSession.rawValue {
                     self.sceneType = .scheduledDay
 
-                    let convertedStartDate = self.convertDateString(model.startDate)
-                    let convertedEndDate = self.convertDateString(model.endDate)
-
+                    let convertedStartDate = DateFormatManager.shared.serverTimeToString(model.startDate,
+                                                                                         from: .isoWithoutMillis,
+                                                                                         to: .monthDayWeekTime)
+                    let convertedEndDate = DateFormatManager.shared.serverTimeToString(model.endDate,
+                                                                                       from: .isoWithoutMillis,
+                                                                                       to: .monthDayWeekTime)
                     let newModel = AttendanceScheduleModel(type: model.type,
                                                            id: model.id,
                                                            location: model.location,
@@ -154,33 +157,4 @@ extension ShowAttendanceViewModel {
             }
             .store(in: self.cancelBag)
     }
-
-    private func convertDateString(_ dateString: String) -> String {
-        let dateFormatter = DateFormatter()
-        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
-        dateFormatter.locale = Locale(identifier: "ko_KR")
-        dateFormatter.timeZone = TimeZone(identifier: "Asia/Seoul")
-
-        guard let date = dateFormatter.date(from: dateString) else { return "" }
-
-        dateFormatter.dateFormat = "M월 d일 EEEE H:mm"
-        return dateFormatter.string(from: date)
-    }
-
-    func formatTimeInterval(startDate: String, endDate: String) -> String {
-        let dateFormatter = DateFormatter()
-        dateFormatter.dateFormat = "M월 d일 EEEE HH:mm"
-        dateFormatter.locale = Locale(identifier: "ko_KR")
-        dateFormatter.timeZone = TimeZone(identifier: "Asia/Seoul")
-
-        guard let startDateObject = dateFormatter.date(from: startDate),
-              let endDateObject = dateFormatter.date(from: endDate) else { return "" }
-
-        let formattedStartDate = dateFormatter.string(from: startDateObject)
-
-        dateFormatter.dateFormat = "HH:mm"
-        let formattedEndDate = dateFormatter.string(from: endDateObject)
-
-        return "\(formattedStartDate) ~ \(formattedEndDate)"
-    }
 }

SOPT-iOS/Projects/Features/DailySoptuneFeature/Sources/DailySoptuneScene/VC/DailySoptuneMainVC.swift

@@ -41,7 +41,7 @@ public final class DailySoptuneMainVC: UIViewController, DailySoptuneMainViewCon
 	private let dateLabel = UILabel().then {
 		$0.textColor = DSKitAsset.Colors.gray100.color
         $0.font = DSKitFontFamily.Suit.medium.font(size: 16)
-		$0.text = setDateFormat(to: "M월 d일 EEEE")
+        $0.text = DateFormatManager.shared.transformDateFormat(to: .monthDayWeek)
 	}
 
 	private let recieveFortune = UILabel().then {

SOPT-iOS/Projects/Features/DailySoptuneFeature/Sources/DailySoptuneScene/ViewModel/DailySoptuneMainViewModel.swift

@@ -65,7 +65,7 @@ extension DailySoptuneMainViewModel {
         input.receiveTodayFortuneButtonTap
             .withUnretained(self)
             .sink { owner, _ in
-                owner.useCase.getDailySoptuneResult(date: setDateFormat(to: "yyyy-MM-dd"))
+                owner.useCase.getDailySoptuneResult(date: DateFormatManager.shared.transformDateFormat(to: .dateWithDash))
                 AmplitudeInstance.shared.track(eventType: .clickCheckTodaySoptune)
             }.store(in: cancelBag)
 

SOPT-iOS/Projects/Features/DailySoptuneFeature/Sources/DailySoptuneScene/Views/DailySoptuneResultContentView.swift

@@ -96,7 +96,7 @@ extension DailySoptuneResultContentView {
 
 extension DailySoptuneResultContentView {
     public func setData(model: DailySoptuneResultModel) {
-        self.dateLabel.text = setDateFormat(to: "MM월 d일 EEEE")
+        self.dateLabel.text = DateFormatManager.shared.transformDateFormat(to: .monthDayWeek)
         self.contentLabel.text = "\(model.userName)님,\n\(model.title.setLineBreakAtMiddle())"
         self.contentLabel.setLineSpacing(lineSpacing: 5)
         self.contentLabel.textAlignment = .center

SOPT-iOS/Projects/Features/HomeFeature/Sources/HomeScene/Cells/Calendar/CalendarCardCVC.swift

@@ -128,8 +128,7 @@ extension CalendarCardCVC {
 extension CalendarCardCVC {
     func configureCell(model: HomePresentationModel.RecentSchedule,
                        userType: UserType) {
-        // TODO: 서버 - 날짜 포맷 변경 후 반영
-        self.dateLabel.text = setDateFormat(date: model.date, to: "MM.dd")
+        self.dateLabel.text = DateFormatManager.shared.transformDateFormat(model.date, from: .monthDayWIthDash, to: .monthDayWithDot)
         self.scheduleTitleLabel.text = model.title
         if let tagType = CalenderCategoryTagType(rawValue: model.type) {
             self.scheduleCategoryTagView.setData(title: tagType.text,

SOPT-iOS/Projects/Features/StampFeature/Sources/ListDetailScene/View/MissionDateView.swift

@@ -163,11 +163,8 @@ extension MissionDateView {
       .publisher(for: .valueChanged)
       .map { $0.date }
       .sink(receiveValue: { [weak self] value in
-        let dateFormatter = DateFormatter().then {
-          $0.dateFormat = "yyyy.MM.dd"
-          $0.locale = .current
-        }
-        let formattedDate = dateFormatter.string(from: value)
+        DateFormatManager.shared.setFormat(.dateWithDot)
+        let formattedDate = DateFormatManager.shared.dateToString(value)
         self?.selectAndFormattedDate = formattedDate
         self?.textField.text = formattedDate
       }).store(in: self.cancelBag)
@@ -208,11 +205,8 @@ extension MissionDateView {
         if let selectAndFormattedDate = self?.selectAndFormattedDate {
           date = selectAndFormattedDate
         } else {
-          let dateFormatter = DateFormatter().then {
-            $0.dateFormat = "yyyy.MM.dd"
-            $0.locale = .current
-          }
-          date = dateFormatter.string(from: Date())
+          DateFormatManager.shared.setFormat(.dateWithDot)
+          date = DateFormatManager.shared.dateToString(Date())
         }
         self?.textField.text = date
         self?.textField.resignFirstResponder()

SOPT-iOS/Projects/Modules/Networks/Sources/Service/NetworkLogger.swift

@@ -9,11 +9,11 @@
 import Foundation
 import Moya
 
+import Core
+
 /// Logs network activity (outgoing requests and incoming responses).
 public final class NetworkLoggerPlugin: PluginType {
     fileprivate let loggerId = "Moya_Logger"
-    fileprivate let dateFormatString = "dd/MM/yyyy HH:mm:ss"
-    fileprivate let dateFormatter = DateFormatter()
     fileprivate let separator = ", "
     fileprivate let terminator = "\n"
     fileprivate let cURLTerminator = "\\\n"
@@ -67,9 +67,8 @@ public final class NetworkLoggerPlugin: PluginType {
 private extension NetworkLoggerPlugin {
 
     var date: String {
-        dateFormatter.dateFormat = dateFormatString
-        dateFormatter.locale = Locale(identifier: "en_US_POSIX")
-        return dateFormatter.string(from: Date())
+        DateFormatManager.shared.setFormat(.networkLogger)
+        return DateFormatManager.shared.dateToString(Date())
     }
 
     func format(_ loggerId: String, date: String, identifier: String, message: String) -> String {