在SwiftUI中单击NavigationView的后退按钮时更新核心数据

import SwiftUI
import Combine

class CoreDataManager: ObservableObject {
    @Published var coreDataValue: String = ""
}

import SwiftUI

struct ContentView: View {
    @EnvironmentObject var coreDataManager: CoreDataManager
    
    var body: some View {
        NavigationView {
            // 视图内容
        }
    }
}

import SwiftUI

struct ContentView: View {
    @EnvironmentObject var coreDataManager: CoreDataManager
    
    var body: some View {
        NavigationView {
            // 视图内容
        }
        .onAppear {
            // 更新核心数据
            coreDataManager.coreDataValue = "New Value"
        }
    }
}