SwiftUI PageView更新外部视图

import SwiftUI

struct ContentView: View {
    @State private var currentPage = 0
    
    var body: some View {
        VStack {
            PageView(currentPage: $currentPage) {
                Text("Page 1")
                Text("Page 2")
                Text("Page 3")
            }
            .frame(height: 200)
            
            Text("Current Page: \(currentPage)")
        }
        .onReceive(Just(currentPage)) { page in
            // 在这里执行更新外部视图的操作
            print("Current Page Updated: \(page)")
        }
    }
}

struct PageView<Content: View>: View {
    @State private var currentPage = 0
    @Binding var currentPageBinding: Int
    var content: Content
    
    init(currentPage: Binding<Int>, @ViewBuilder content: () -> Content) {
        self._currentPageBinding = currentPage
        self.content = content()
    }
    
    var body: some View {
        TabView(selection: $currentPage) {
            content
                .tabItem { EmptyView() }
                .tag(currentPage)
        }
        .onReceive(Just(currentPage)) { page in
            currentPageBinding = page
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}