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