如果操作未立即完成，则绑定到@Published var时SwiftUI视图不会显示动画

import SwiftUI

class ViewModel: ObservableObject {
    @Published var isAnimating = false
    
    func performOperation() {
        isAnimating = true
        
        // Simulate a delay in the operation
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
            // Update the property value after the delay
            self.isAnimating = false
        }
    }
}

struct ContentView: View {
    @StateObject private var viewModel = ViewModel()
    
    var body: some View {
        VStack {
            Text("Animation Example")
                .font(.title)
                .padding()
            
            Rectangle()
                .foregroundColor(.blue)
                .frame(width: 200, height: 200)
                .scaleEffect(viewModel.isAnimating ? 1.5 : 1.0)
                .animation(.easeInOut)
            
            Button("Perform Operation") {
                viewModel.performOperation()
            }
            .padding()
        }
    }
}