backgroundColor property
final
The background color of the navigation bar. If it contains transparency, the tab bar will automatically produce a blurring effect to the content behind it. This behavior can be disabled by setting enableBackgroundFilterBlur to false.
By default, the navigation bar's background is visible only when scrolled under. This behavior can be controlled with automaticBackgroundVisibility.
Defaults to CupertinoTheme's barBackgroundColor if null.
Implementation
final Color? backgroundColor;