SwiftUI出现displayModeButtonItem is internally managed and not exposed for DoubleColumn style错误的解决

Xcode12.x开发环境中，用户在点击SwiftUI列表项进行导航跳转后，当回退到父视图时，Xcode控制台会有提示：

[Assert] displayModeButtonItem is internally managed and not exposed for DoubleColumn style. Returning an empty, disconnected UIBarButtonItem to fulfill the non-null contract.

该列表往往包含在一个复杂的层级结构中。

解决办法是，在最外层的NavigationView上添加如下修改器:

NavigationView {
   ...} .