如何在SwiftUI中订阅数组的大小？

import SwiftUI
import Combine

class ArraySizeManager: ObservableObject {
    @Published var array: [Int] = []
    
    var arraySize: Int {
        array.count
    }
}

import SwiftUI

struct ContentView: View {
    @ObservedObject var sizeManager = ArraySizeManager()
    
    var body: some View {
        VStack {
            Text("Array Size: \(sizeManager.arraySize)")
            
            Button(action: {
                // 修改数组
                self.sizeManager.array.append(1)
            }) {
                Text("Add Element")
            }
        }
    }
}