createState method
Creates the mutable state for this widget at a given location in the tree.
Subclasses should override this method to return a newly created instance of their associated State subclass:
@override
State<SomeWidget> createState() => _SomeWidgetState();
The framework can call this method multiple times over the lifetime of a StatefulWidget. For example, if the widget is inserted into the tree in multiple locations, the framework will create a separate State object for each location. Similarly, if the widget is removed from the tree and later inserted into the tree again, the framework will call createState again to create a fresh State object, simplifying the lifecycle of State objects.
Implementation
@override
State<StatefulWidget> createState() {
List<Map> jsonList = codes;
List<CountryPicked> elements = jsonList
.map((s) => CountryPicked(
countryName: s['name'],
countryExtension: s['code'],
countryCode: s['dial_code'],
//flagImage: 'assets/flags/${s['code']}.svg',
))
.toList();
return _CountryPicker(elements);
}