automaticBackgroundVisibility property
final
Whether the navigation bar appears transparent when no content is scrolled under.
If this is true, the navigation bar's background color will be transparent until the content scrolls under it. If false, the navigation bar will always use backgroundColor as its background color.
If the navigation bar is not a child of a CupertinoPageScaffold, this has no effect.
This value defaults to true.
Implementation
final bool automaticBackgroundVisibility;