Navigation Bar title

import SwiftUI

struct ContentView: View {
    @State private var titleColor: UIColor = .black

    var body: some View {
        NavigationView {
            ScrollView {
                ScrollViewReader { proxy in
                    VStack {
                        ForEach(0..<100) { index in
                            Text("Item \(index)")
                                .padding()
                        }
                    }
                    .background(GeometryReader { geo in
                        Color.clear
                            .preference(key: ScrollOffsetPreferenceKey.self, value: geo.frame(in: .global).minY)
                    })
                }
            }
            .onPreferenceChange(ScrollOffsetPreferenceKey.self) { value in
                if value < 0 {
                    titleColor = .red // Change to your desired color when scrolling
                } else {
                    titleColor = .black // Change to your desired color when not scrolling
                }
            }
            .navigationBarTitle("Title", displayMode: .inline)
            .navigationBarColor(titleColor)
        }
    }
}

struct ScrollOffsetPreferenceKey: PreferenceKey {
    typealias Value = CGFloat
    static var defaultValue: CGFloat = 0
    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
        value = nextValue()
    }
}

extension View {
    func navigationBarColor(_ color: UIColor) -> some View {
        self.modifier(NavigationBarModifier(backgroundColor: .clear, titleColor: color))
    }
}

struct NavigationBarModifier: ViewModifier {
    var backgroundColor: UIColor?
    var titleColor: UIColor?

    init(backgroundColor: UIColor?, titleColor: UIColor?) {
        self.backgroundColor = backgroundColor
        self.titleColor = titleColor
        let coloredAppearance = UINavigationBarAppearance()
        coloredAppearance.configureWithTransparentBackground()
        coloredAppearance.backgroundColor = backgroundColor
        coloredAppearance.titleTextAttributes = [.foregroundColor: titleColor ?? .black]
        coloredAppearance.largeTitleTextAttributes = [.foregroundColor: titleColor ?? .black]

        UINavigationBar.appearance().standardAppearance = coloredAppearance
        UINavigationBar.appearance().compactAppearance = coloredAppearance
        UINavigationBar.appearance().scrollEdgeAppearance = coloredAppearance
    }

    func body(content: Content) -> some View {
        ZStack {
            content
            VStack {
                GeometryReader { geometry in
                    Color.clear
                        .preference(key: NavigationBarHeightPreferenceKey.self, value: geometry.size.height)
                }
                Spacer()
            }
        }
    }
}

struct NavigationBarHeightPreferenceKey: PreferenceKey {
    typealias Value = CGFloat
    static var defaultValue: CGFloat = 0
    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
        value = nextValue()
    }
}