Slide focus to TextField in Flutter

var focusNode = FocusNode();
var textField = TextField(focusNode: focusNode);

FocusScope.of(context).requestFocus(focusNode);
// or 
focusNode.requestFocus();

See also

• https://api.flutter.dev/flutter/widgets/FocusNode-class.html
• https://flutter.dev/docs/cookbook/forms/focus

 TextField(
      autofocus: true,
);