SwiftUI中如何在Observed属性变更时触发视图动画？

我原本通过点击图片修改本地@State属性可以实现图片缩放动画，现在需要实现的是：当ObservableObject内部的@Published属性动态变更时，每次都触发图片的缩放动画。

使用本地@State属性包装器（运行正常） #

struct ContentView: View {
    @State private var scaleValue = 1.0
    @State private var isAnimating: Bool = true
        
    var body: some View {
        
        Image(systemName: "circle.fill")
            .scaleEffect(scaleValue)
            .font(.title)
            .foregroundColor(.green)
            .animation(.easeOut(duration: 0.3), value: isAnimating)
            .onTapGesture {
                self.isAnimating.toggle()
                self.scaleValue = 1.5
                DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.3){
                    self.scaleValue = 1.0
                }
            }
    }
}

使用被观察的@Published属性包装器（无法正常运行，不确定动画逻辑位置） #

struct ContentView: View {
    @State private var scaleValue = 1.0       
    @StateObject private var contentVM = ContentViewModel()
    
    var body: some View {
        
        Image(systemName: "circle.fill")
            .scaleEffect(scaleValue)
            .font(.title)
            .foregroundColor(.green)
            .animation(.easeOut(duration: 0.3), value: contentVM.isAnimating)
           // 不确定该在哪里添加触发动画的逻辑

    }
}

可行解决方案 #

感谢@Fogmeister和@burnsi提供思路

class ContentViewModel: ObservableObject{
     @Published var isAnimatingImage = false 
}

struct ContentView2: View {
    @StateObject private var contentVM = ContentViewModel()
    @State private var scaleValue = 1.0
    
    var body: some View {
        Image(systemName: "circle.fill")
            .scaleEffect(scaleValue)
            .font(.title)
            .foregroundColor(.green)
            .animation(.easeOut(duration: 0.3), value: scaleValue)
            .onChange(of: contentVM.isAnimatingImage) { _ in
                animateImage()
            }
    }

    func animateImage(){
        scaleValue = 1.5
        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.3){
            self.scaleValue = 1.0
        }
    }
}

注：原解决方案中在body内部声明@State的写法不符合SwiftUI规范，已调整至结构体属性声明位置

内容的提问来源于stack exchange，提问作者fs_tigre