titleTextStyle property Null safety
The default text style for the AppBar's title widget.
If this property is null, then AppBarTheme.titleTextStyle of ThemeData.appBarTheme is used. If that is also null, the default value is a copy of the overall theme's TextTheme.titleLarge TextStyle, with color set to the app bar's foregroundColor.
- toolbarTextStyle, which is the default text style for the AppBar's title, leading, and actions widgets, also known as the AppBar's "toolbar".
- DefaultTextStyle, which overrides the default text style for all of the the widgets in a subtree.
final TextStyle? titleTextStyle;