在SWIFTUI&39；S视图修改器中使用等待关键字

如果你必须使用actor，那么你应该这样做:

struct ColorView: View {
    @ObservedObject private var model = ActorModel.shared

    @State private var color: Color = .gray //Default
    
    var body: some View {
        VStack {
            Rectangle()
                .foregroundStyle(color) // <-- Problem!
                .frame(width: 100, height: 100)
        }
        .padding()
        .onAppear {
            Task {
                color = await model.isActive ? .red : .blue
            }
        }
    }
}

不过，@Published属性在这里没有意义.因为你不会从anctor那里得到更新.

如果你需要订阅更新，那么你可以try 另一种方法:

struct ColorView: View {
    @ObservedObject private var model = ActorModel.shared
    @State private var isActiveState: Bool = false

    var body: some View {
        VStack {
            // ...
        }
        .onAppear {
            Task {
                await subscribeToModelChanges()
            }
        }
    }

    private func subscribeToModelChanges() async {
        await model.subscribeToIsActiveChanges { isActive in
            self.isActiveState = isActive
        }
    }
}

actor ActorModel: ObservableObject {
    // ...

    func subscribeToIsActiveChanges(_ onChange: @escaping (Bool) -> Void) async {
        // Logic to notify the subscriber about changes
        // This part is tricky because Actor doesn't have a built-in observation mechanism
        // You might need to implement your own mechanism to notify about changes
    }
}