Refactor/quest view header label

DailyQuest/DailyQuest/Presentation/Home/View/QuestViewHeader.swift

@@ -16,9 +16,9 @@ final class QuestViewHeader: UIStackView {
     var buttonDidClick = PublishSubject<Void>()
 
     // MARK: - Components
-    private lazy var titleLabel: UILabel = {
+    private(set) lazy var titleLabel: UILabel = {
         let titleLabel = UILabel()
-        titleLabel.text = "Today Quest"
+        titleLabel.text = "Today Quests"
         titleLabel.textColor = .maxViolet
         titleLabel.font = UIFont.boldSystemFont(ofSize: 32)
 

DailyQuest/DailyQuest/Presentation/Home/ViewController/HomeViewController.swift

@@ -162,13 +162,21 @@ final class HomeViewController: UIViewController {
             disposeBag: disposableBag
         )
 
+        bindToQuestViewHeader(with: output)
         bindToCalendarView(with: output)
         bindToQuestHeaderButton()
         bindToQuestView(with: output)
         bindToStatusView(with: output)
 
     }
 
+    private func bindToQuestViewHeader(with output: HomeViewModel.Output) {
+        output
+            .questHeaderLabel
+            .bind(to: questViewHeader.titleLabel.rx.text)
+            .disposed(by: disposableBag)
+    }
+
     private func bindToCalendarView(with output: HomeViewModel.Output) {
         output
             .displayDays

DailyQuest/DailyQuest/Presentation/Home/ViewModel/HomeViewModel.swift

@@ -31,6 +31,7 @@ final class HomeViewModel {
     }
 
     struct Output {
+        let questHeaderLabel: Observable<String>
         let data: Driver<[Quest]>
         let userData: Observable<User>
         let questStatus: Driver<(Int, Int)>
@@ -78,6 +79,11 @@ final class HomeViewModel {
                 return !result.isEmpty ? owner.currentDate : nil
             }
 
+        let questHeaderLabel = input
+            .daySelected
+            .map(calculateRelative(_:))
+            .asObservable()
+
         let data = Observable
             .merge(
                 updated,
@@ -175,11 +181,26 @@ final class HomeViewModel {
             })
             .disposed(by: disposeBag)
 
-        return Output(data: data,
+        return Output(questHeaderLabel: questHeaderLabel,
+                      data: data,
                       userData: userData,
                       questStatus: questStatus,
                       profileTapResult: profileTapResult,
                       currentMonth: currentMonth,
                       displayDays: displayDays)
     }
 }
+
+private extension HomeViewModel {
+    func calculateRelative(_ date: Date) -> String {
+        let today = Date()
+
+        if today.startOfDay > date.startOfDay {
+            return "Previous Quests"
+        } else if today.startOfDay < date.startOfDay {
+            return "Upcomming Quests"
+        } else {
+            return "Today Quests"
+        }
+    }
+}