🔀 :: (#1230) 노래 상세에서 재생목록 접근 시 재생목록 자동 스크롤

Projects/Features/BaseFeature/Sources/GlobalState/PlayListPresenterGlobalState.swift

@@ -2,20 +2,25 @@ import Foundation
 import RxSwift
 
 public protocol PlayListPresenterGlobalStateProtocol {
-    var presentPlayListObservable: Observable<Void> { get }
+    var presentPlayListObservable: Observable<String?> { get }
 
+    func presentPlayList(currentSongID: String?)
     func presentPlayList()
 }
 
 public final class PlayListPresenterGlobalState: PlayListPresenterGlobalStateProtocol {
-    private let presentPlayListSubject = PublishSubject<Void>()
-    public var presentPlayListObservable: Observable<Void> {
+    private let presentPlayListSubject = PublishSubject<String?>()
+    public var presentPlayListObservable: Observable<String?> {
         presentPlayListSubject
     }
 
     public init() {}
 
+    public func presentPlayList(currentSongID: String?) {
+        presentPlayListSubject.onNext(currentSongID)
+    }
+
     public func presentPlayList() {
-        presentPlayListSubject.onNext(())
+        presentPlayList(currentSongID: nil)
     }
 }

Projects/Features/MainTabFeature/Sources/ViewControllers/MainContainerViewController.swift

@@ -122,9 +122,13 @@ private extension MainContainerViewController {
         )
 
         playlistPresenterGlobalState.presentPlayListObservable
-            .bind { [navigationController, playlistFactory] _ in
+            .bind { [navigationController, playlistFactory] currentSongID in
                 guard let playlistFactory else { return }
-                let playlistViewController = playlistFactory.makeViewController()
+                let playlistViewController = if let currentSongID {
+                    playlistFactory.makeViewController(currentSongID: currentSongID)
+                } else {
+                    playlistFactory.makeViewController()
+                }
                 playlistViewController.modalPresentationStyle = .overFullScreen
                 navigationController?.topViewController?.present(playlistViewController, animated: true)
             }

Projects/Features/MusicDetailFeature/Demo/Sources/AppDelegate.swift

@@ -119,7 +119,8 @@ final class DummyTextPopupFactory: TextPopupFactory {
 }
 
 final class DummyPlaylistPresenterGlobalState: PlayListPresenterGlobalStateProtocol {
-    var presentPlayListObservable: RxSwift.Observable<Void> { .empty() }
+    var presentPlayListObservable: RxSwift.Observable<String?> { .empty() }
+    func presentPlayList(currentSongID: String?) {}
     func presentPlayList() {}
 }
 

Projects/Features/MusicDetailFeature/Sources/MusicDetail/MusicDetailReactor.swift

@@ -43,7 +43,7 @@ final class MusicDetailReactor: Reactor {
         case credit(id: String)
         case lyricsHighlighting(model: LyricHighlightingRequiredModel)
         case musicPick(id: String)
-        case playlist
+        case playlist(id: String)
         case dismiss
         case textPopup(text: String, completion: () -> Void)
         case signin
@@ -411,7 +411,7 @@ private extension MusicDetailReactor {
         guard let song = currentState.selectedSong else { return .empty() }
         let log = Log.clickPlaylistButton(id: song.videoID)
         LogManager.analytics(log)
-        return navigateMutation(navigate: .playlist)
+        return navigateMutation(navigate: .playlist(id: song.videoID))
     }
 }
 

Projects/Features/MusicDetailFeature/Sources/MusicDetail/MusicDetailViewController.swift

@@ -137,8 +137,8 @@ final class MusicDetailViewController: BaseReactorViewController<MusicDetailReac
                     owner.navigateLyricsHighlighing(model: model)
                 case let .musicPick(id):
                     owner.presentMusicPick(id: id)
-                case .playlist:
-                    owner.presentPlaylist()
+                case let .playlist(id):
+                    owner.presentPlaylist(id: id)
                 case let .textPopup(text, completion):
                     owner.presentTextPopup(text: text, completion: completion)
                 case .signin:
@@ -240,9 +240,9 @@ private extension MusicDetailViewController {
         self.present(viewController, animated: true)
     }
 
-    func presentPlaylist() {
+    func presentPlaylist(id: String) {
         self.dismiss(animated: true) { [playlistPresenterGlobalState] in
-            playlistPresenterGlobalState.presentPlayList()
+            playlistPresenterGlobalState.presentPlayList(currentSongID: id)
         }
     }
 

Projects/Features/PlaylistFeature/Interface/PlaylistFactory.swift

@@ -2,4 +2,5 @@ import UIKit
 
 public protocol PlaylistFactory {
     func makeViewController() -> UIViewController
+    func makeViewController(currentSongID: String) -> UIViewController
 }

Projects/Features/PlaylistFeature/Sources/Components/PlaylistComponent.swift

@@ -16,6 +16,20 @@ public final class PlaylistComponent: Component<PlaylistDependency>, PlaylistFac
     public func makeViewController() -> UIViewController {
         let viewModel = PlaylistViewModel()
         let viewController = PlaylistViewController(
+            currentSongID: nil,
+            viewModel: viewModel,
+            containSongsFactory: dependency.containSongsFactory,
+            songDetailPresenter: dependency.songDetailPresenter,
+            textPopupFactory: dependency.textPopupFactory,
+            signInFactory: dependency.signInFactory
+        )
+        return viewController
+    }
+
+    public func makeViewController(currentSongID: String) -> UIViewController {
+        let viewModel = PlaylistViewModel()
+        let viewController = PlaylistViewController(
+            currentSongID: currentSongID,
             viewModel: viewModel,
             containSongsFactory: dependency.containSongsFactory,
             songDetailPresenter: dependency.songDetailPresenter,

Projects/Features/PlaylistFeature/Sources/ViewControllers/PlaylistViewController.swift

@@ -52,13 +52,17 @@ public final class PlaylistViewController: UIViewController, SongCartViewType {
     )
     lazy var output = self.viewModel.transform(from: input)
 
+    private let currentSongID: String?
+
     init(
+        currentSongID: String?,
         viewModel: PlaylistViewModel,
         containSongsFactory: ContainSongsFactory,
         songDetailPresenter: any SongDetailPresentable,
         textPopupFactory: any TextPopupFactory,
         signInFactory: any SignInFactory
     ) {
+        self.currentSongID = currentSongID
         self.containSongsFactory = containSongsFactory
         self.songDetailPresenter = songDetailPresenter
         self.signInFactory = signInFactory
@@ -178,6 +182,20 @@ private extension PlaylistViewController {
 
         output.playlists
             .map { [PlayListSectionModel.init(model: 0, items: $0)] }
+            .do(afterNext: { [currentSongID, tableView = playlistView.playlistTableView] playListSectionModel in
+                guard let currentSongID else { return }
+                guard
+                    let sectionIndex = playListSectionModel.firstIndex(where: { model in
+                        model.items.contains(where: { $0.id == currentSongID })
+                    }),
+                    let itemIndex = playListSectionModel[safe: sectionIndex]?.items
+                    .firstIndex(where: { $0.id == currentSongID })
+                else { return }
+                let index = IndexPath(row: itemIndex, section: sectionIndex)
+                DispatchQueue.main.async {
+                    tableView.scrollToRow(at: index, at: .middle, animated: false)
+                }
+            })
             .bind(to: playlistView.playlistTableView.rx.items(dataSource: createDatasources(output: output)))
             .disposed(by: disposeBag)