cupertinoErrorBuilder<T> function
A function typically used for building a CupertinoFormRow error widget.
Returns a Text widget when FastFormFieldState.errorText is a String
otherwise null
.
Implementation
Text? cupertinoErrorBuilder<T>(FastFormFieldState<T> field) {
final FastFormFieldState<T>(:errorText) = field;
return errorText is String ? Text(errorText) : null;
}