feat(creator): 채널 탭 고정을 연결한다

SodaLive/Sources/V2/CreatorChannel/Components/CreatorChannelTitleBar.swift

@@ -12,7 +12,7 @@ struct CreatorChannelTitleBar: View {
     let onTapMore: () -> Void
 
     var body: some View {
-        HStack(spacing: 0) {
+        HStack(spacing: SodaSpacing.s12) {
             Button(action: onTapBack) {
                 Image("ic_new_bar_back")
                     .resizable()
@@ -20,6 +20,10 @@ struct CreatorChannelTitleBar: View {
             }
             .buttonStyle(.plain)
 
+            Text("")
+                .appFont(.heading2)
+
+
             Spacer(minLength: 0)
 
             HStack(spacing: SodaSpacing.s14) {

SodaLive/Sources/V2/CreatorChannel/CreatorChannelView.swift

@@ -5,6 +5,10 @@ struct CreatorChannelView: View {
     
     @StateObject private var viewModel = CreatorChannelViewModel()
     @Environment(\.dismiss) private var dismiss
+    @State private var tabBarMinY: CGFloat = .greatestFiniteMagnitude
+
+    private let titleBarHeight: CGFloat = 56
+    private let tabBarHeight: CGFloat = 52
     
     init(creatorId: Int, viewModel: CreatorChannelViewModel = CreatorChannelViewModel()) {
         self.creatorId = creatorId
@@ -12,23 +16,55 @@ struct CreatorChannelView: View {
     }
     
     var body: some View {
-        ZStack {
-            Color.black.ignoresSafeArea()
-            
+        GeometryReader { proxy in
+            let titleBarBottomY = proxy.safeAreaInsets.top + titleBarHeight
+            let backgroundProgress = clamp(1 - ((tabBarMinY - titleBarBottomY) / titleBarHeight))
+            let isTabBarSticky = tabBarMinY <= titleBarBottomY
+
             ZStack(alignment: .top) {
+                Color.black.ignoresSafeArea()
+
                 ScrollView(.vertical, showsIndicators: false) {
                     VStack(spacing: 0) {
                         headerSection
+
                         tabBar
+                            .background(
+                                GeometryReader { geometry in
+                                    let minY = geometry.frame(in: .global).minY
+                                    Color.clear
+                                        .onAppear {
+                                            updateTabBarMinY(minY)
+                                        }
+                                        .onChange(of: minY) { value in
+                                            updateTabBarMinY(value)
+                                        }
+                                }
+                            )
+                            .opacity(isTabBarSticky ? 0 : 1)
+
                         selectedTabContent
                     }
                 }
+                .ignoresSafeArea(.container, edges: .vertical)
+
+                if isTabBarSticky {
+                    tabBar
+                        .frame(height: tabBarHeight)
+                        .offset(y: titleBarHeight)
+                }
                 
-                titleBar
-            }
-            
-            if viewModel.isLoading {
-                LoadingView()
+                VStack(spacing: 0) {
+                    Color.black
+                        .opacity(backgroundProgress)
+                        .frame(height: proxy.safeAreaInsets.top)
+                    titleBar(backgroundProgress: backgroundProgress)
+                    }
+                    .ignoresSafeArea(.container, edges: .top)
+
+                if viewModel.isLoading {
+                    LoadingView()
+                }
             }
         }
         .navigationBarBackButtonHidden(true)
@@ -40,11 +76,11 @@ struct CreatorChannelView: View {
         .sodaToast(isPresented: $viewModel.isShowPopup, message: viewModel.errorMessage, autohideIn: 1)
     }
     
-    private var titleBar: some View {
+    private func titleBar(backgroundProgress: CGFloat) -> some View {
         CreatorChannelTitleBar(
             isFollow: viewModel.response?.creator.isFollow ?? false,
             isNotify: viewModel.response?.creator.isNotify ?? false,
-            backgroundProgress: 0,
+            backgroundProgress: backgroundProgress,
             onTapBack: {
                 dismiss()
             },
@@ -75,6 +111,17 @@ struct CreatorChannelView: View {
         CreatorChannelTabBar(selectedTab: $viewModel.selectedTab)
     }
     
+    private func clamp(_ value: CGFloat) -> CGFloat {
+        max(0, min(value, 1))
+    }
+
+    private func updateTabBarMinY(_ value: CGFloat) {
+        guard tabBarMinY != value else { return }
+        DispatchQueue.main.async {
+            tabBarMinY = value
+        }
+    }
+
     @ViewBuilder
     private var selectedTabContent: some View {
         CreatorChannelPlaceholderTabView(title: viewModel.selectedTab.title)