perf: Optimize ScrollView performance with onScrollGeometryChange
- Replace PreferenceKey-based scroll tracking with onScrollGeometryChange API - Remove ScrollOffsetPreferenceKey struct (no longer needed) - Add 50px threshold for scroll offset updates to reduce processing frequency - Add 5% threshold for readingProgress state updates to minimize view refreshes - Simplify header view by removing parallax effect and nested GeometryReader - Keep single GeometryReader only for container dimensions (width/height) - Fix WebView width constraints with explicit frame settings This significantly improves scroll performance by reducing unnecessary calculations and state updates during scrolling.
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@ -38,19 +38,13 @@ struct BookmarkDetailView: View {
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ProgressView(value: readingProgress)
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.progressViewStyle(LinearProgressViewStyle())
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.frame(height: 3)
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GeometryReader { outerGeo in
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GeometryReader { geometry in
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ScrollView {
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VStack(spacing: 0) {
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GeometryReader { geo in
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Color.clear
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.preference(key: ScrollOffsetPreferenceKey.self,
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value: geo.frame(in: .named("scroll")).minY)
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}
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.frame(height: 0)
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ZStack(alignment: .top) {
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headerView(geometry: outerGeo)
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headerView(width: geometry.size.width)
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VStack(alignment: .leading, spacing: 16) {
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Color.clear.frame(height: viewModel.bookmarkDetail.imageUrl.isEmpty ? 84 : headerHeight)
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Color.clear.frame(width: geometry.size.width, height: viewModel.bookmarkDetail.imageUrl.isEmpty ? 84 : headerHeight)
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titleSection
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Divider().padding(.horizontal)
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if showJumpToProgressButton {
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@ -94,22 +88,40 @@ struct BookmarkDetailView: View {
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.frame(maxWidth: .infinity)
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}
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}
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.frame(maxWidth: .infinity)
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}
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}
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}
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.coordinateSpace(name: "scroll")
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.onPreferenceChange(ScrollOffsetPreferenceKey.self) { offset in
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scrollViewHeight = outerGeo.size.height
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let maxOffset = webViewHeight - scrollViewHeight
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let rawProgress = -offset / (maxOffset != 0 ? maxOffset : 1)
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let progress = min(max(rawProgress, 0), 1)
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readingProgress = progress
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viewModel.debouncedUpdateReadProgress(id: bookmarkId, progress: progress, anchor: nil)
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}
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.ignoresSafeArea(edges: .top)
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.scrollPosition($scrollPosition)
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.onScrollGeometryChange(for: CGFloat.self) { geo in
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geo.contentOffset.y
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} action: { oldValue, newValue in
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// Early exit: only process if scroll changed significantly (> 50px)
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guard abs(newValue - oldValue) > 50 else { return }
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let offset = newValue
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let maxOffset = webViewHeight - geometry.size.height
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let rawProgress = offset / (maxOffset > 0 ? maxOffset : 1)
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let progress = min(max(rawProgress, 0), 1)
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// Only update if change is significant (> 5%) to avoid lag
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let threshold: Double = 0.05
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if abs(progress - readingProgress) > threshold {
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readingProgress = progress
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// Always update backend (debounced internally)
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viewModel.debouncedUpdateReadProgress(id: bookmarkId, progress: progress, anchor: nil)
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}
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}
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.onScrollGeometryChange(for: CGFloat.self) { geo in
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geo.containerSize.height
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} action: { oldValue, newValue in
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scrollViewHeight = newValue
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}
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}
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}
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.frame(maxWidth: .infinity)
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.navigationBarTitleDisplayMode(.inline)
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.toolbar {
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ToolbarItem(placement: .navigationBarTrailing) {
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@ -183,22 +195,15 @@ struct BookmarkDetailView: View {
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// MARK: - ViewBuilder
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@ViewBuilder
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private func headerView(geometry: GeometryProxy) -> some View {
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private func headerView(width: CGFloat) -> some View {
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if !viewModel.bookmarkDetail.imageUrl.isEmpty {
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GeometryReader { geo in
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let offset = geo.frame(in: .global).minY
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ZStack(alignment: .top) {
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ZStack(alignment: .bottomTrailing) {
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CachedAsyncImage(url: URL(string: viewModel.bookmarkDetail.imageUrl))
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.aspectRatio(contentMode: .fill)
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.frame(width: geometry.size.width, height: headerHeight + (offset > 0 ? offset : 0))
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.frame(width: width, height: headerHeight)
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.clipped()
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.offset(y: (offset > 0 ? -offset : 0))
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// Tap area and zoom icon
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VStack {
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Spacer()
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HStack {
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Spacer()
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// Zoom icon
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Button(action: {
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showingImageViewer = true
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}) {
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@ -218,11 +223,6 @@ struct BookmarkDetailView: View {
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.padding(.trailing, 16)
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.padding(.bottom, 16)
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}
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}
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.frame(height: headerHeight + (offset > 0 ? offset : 0))
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.offset(y: (offset > 0 ? -offset : 0))
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}
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}
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.frame(height: headerHeight)
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.ignoresSafeArea(edges: .top)
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.onTapGesture {
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@ -252,9 +252,10 @@ struct BookmarkDetailView: View {
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webViewHeight = height
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}
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}
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.frame(maxWidth: .infinity)
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.frame(height: webViewHeight)
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.cornerRadius(14)
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.padding(.horizontal)
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.padding(.horizontal, 4)
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.animation(.easeInOut, value: webViewHeight)
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} else if viewModel.isLoadingArticle {
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ProgressView("Loading article...")
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@ -451,14 +452,6 @@ struct BookmarkDetailView: View {
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}
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}
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struct ScrollOffsetPreferenceKey: PreferenceKey {
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typealias Value = CGFloat
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static var defaultValue = CGFloat.zero
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static func reduce(value: inout Value, nextValue: () -> Value) {
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value += nextValue()
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}
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}
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#Preview {
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NavigationView {
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BookmarkDetailView(bookmarkId: "123",
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