updates

pedi-foods/Sources/PediFoods/Views/Main/HomeScrollOffsetObserver.swift

@@ -1,76 +1,35 @@
 import SwiftUI
-#if canImport(UIKit)
-import UIKit
-#endif
+
+enum HomeScrollCoordinateSpace {
+    static let name = "home-scroll"
+}
 
 #if os(iOS)
-@MainActor
-struct ScrollOffsetObserver: UIViewRepresentable {
-    let onOffsetChange: (CGFloat) -> Void
+struct HomeScrollOffsetPreferenceKey: PreferenceKey {
+    static let defaultValue: CGFloat = 0
 
-    func makeUIView(context: Context) -> ScrollOffsetProbeView {
-        let view = ScrollOffsetProbeView()
-        view.onOffsetChange = onOffsetChange
-        return view
-    }
-
-    func updateUIView(_ uiView: ScrollOffsetProbeView, context: Context) {
-        uiView.onOffsetChange = onOffsetChange
-        uiView.attachIfNeeded()
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        value = nextValue()
     }
 }
 
-@MainActor
-final class ScrollOffsetProbeView: UIView {
-    var onOffsetChange: (CGFloat) -> Void = { _ in }
+struct ScrollOffsetObserver: View {
+    let onOffsetChange: (CGFloat) -> Void
 
-    private weak var observedScrollView: UIScrollView?
-    private var observation: NSKeyValueObservation?
-
-    override init(frame: CGRect) {
-        super.init(frame: frame)
-        backgroundColor = .clear
-        isUserInteractionEnabled = false
-    }
-
-    required init?(coder: NSCoder) {
-        super.init(coder: coder)
-    }
-
-    deinit {
-        observation?.invalidate()
-    }
-
-    override func didMoveToSuperview() {
-        super.didMoveToSuperview()
-        attachIfNeeded()
-    }
-
-    override func didMoveToWindow() {
-        super.didMoveToWindow()
-        attachIfNeeded()
-    }
-
-    func attachIfNeeded() {
-        guard let scrollView = findEnclosingScrollView() else { return }
-        guard scrollView !== observedScrollView else { return }
-
-        observation?.invalidate()
-        observedScrollView = scrollView
-        observation = scrollView.observe(\.contentOffset, options: [.initial, .new]) { [weak self] sv, _ in
-            self?.onOffsetChange(sv.contentOffset.y)
-        }
-    }
-
-    private func findEnclosingScrollView() -> UIScrollView? {
-        var view: UIView? = self
-        while let current = view {
-            if let scrollView = current as? UIScrollView {
-                return scrollView
+    var body: some View {
+        Color.clear
+            .frame(height: 0)
+            .background(
+                GeometryReader { geometry in
+                    Color.clear.preference(
+                        key: HomeScrollOffsetPreferenceKey.self,
+                        value: geometry.frame(in: .named(HomeScrollCoordinateSpace.name)).minY
+                    )
+                }
+            )
+            .onPreferenceChange(HomeScrollOffsetPreferenceKey.self) { minY in
+                onOffsetChange(-minY)
             }
-            view = current.superview
-        }
-        return nil
     }
 }
 #endif