我准备了一个简单的三层示例：

struct Element: Identifiable {
    let id = UUID()
    let text: String
    init(text: String) {
        self.text = text
    }
}

struct FirstView: View {
    @State var elements = [Element(text: "a"), Element(text: "b")]
    var body: some View {
        NavigationView {
            List(elements) { element in
                NavigationLink {
                    SecondView()
                } label: {
                    VStack(alignment: .leading, spacing: 3, content: {
                        Text(element.text)
                            .font(.system(size: 12))
                            .foregroundColor(.white)
                    })
                }
            }
            .navigationTitle("First")
        }
    }
}

struct SecondView: View {
    @State var elements = [Element(text: "1"), Element(text: "2")]
    var body: some View {
        NavigationView {
            List(elements) { element in
                NavigationLink {
                    ThirdView()
                } label: {
                    VStack(alignment: .leading, spacing: 3, content: {
                        Text(element.text)
                            .font(.system(size: 12))
                            .foregroundColor(.white)
                    })
                }
            }
            .navigationTitle("Second")
        }
    }
}

struct ThirdView: View {
    @State var elements = [Element(text: "+"), Element(text: "-")]
    var body: some View {
        NavigationView {
            List(elements) { element in
                NavigationLink {
                    SecondView()
                } label: {
                    VStack(alignment: .leading, spacing: 3, content: {
                        Text(element.text)
                            .font(.system(size: 12))
                            .foregroundColor(.white)
                    })
                }
            }
            .navigationTitle("Third")
        }
    }
}

而这就是当我进入下一个级别时，Apple Watch中会发生的事情：
第一节第一节第一节第一节第一节第二节第一节
正如你在第三个视图中看到的，导航标题没有更新。为什么？
渲染也有问题吗？当我向下滑动第二个列表时，结果如下：