为什么不能在我的整个模式视图上使用SwiftUI中的.gesture()？

struct ContentView: View {
    @State private var offset = CGSize.zero
    
    var body: some View {
        ZStack {
            // 模式视图
            RoundedRectangle(cornerRadius: 10)
                .fill(Color.blue)
                .frame(width: 200, height: 200)
                .offset(offset)
                .gesture(
                    DragGesture()
                        .onChanged { value in
                            self.offset = value.translation
                        }
                        .onEnded { _ in
                            self.offset = CGSize.zero
                        }
                )
            
            // 透明视图，用于添加手势
            Color.clear
                .frame(width: 200, height: 200)
                .gesture(
                    DragGesture()
                        .onChanged { value in
                            self.offset = value.translation
                        }
                        .onEnded { _ in
                            self.offset = CGSize.zero
                        }
                )
        }
    }
}