dismiss keyboard flutter

                                    class YourPage extends StatefulWidget {
  createState() => _YourPageState();
}

class _YourPageState extends State<MobileHome> {

  FocusNode focusNode = new FocusNode();
  @override
  Widget build(BuildContext context) {
  return Scaffold(
  	body: Column(
      mainAxisAlignment: MainAxisAlignment.center,
      crossAxisAlignment: CrossAxisAlignment.center,
      children: [
        TextField(
          focusNode: focusNode,
        ),
        SizedBox(height: 10,),
        RaisedButton(child: Text("UP"),onPressed: (){
          FocusScope.of(context).requestFocus(focusNode);
        },),
        SizedBox(height: 10,),
        RaisedButton(child: Text("DOWN"),onPressed: (){
          focusNode.unfocus();
        },),    
      ],
    )
  );
  }
}

                                    // The correct way of closing the keyboard is

FocusScope.of(context).unfocus();

                                    FocusScope.of(context).unfocus()

                                    override func viewDidLoad() {
    super.viewDidLoad()

    //Looks for single or multiple taps. 
    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "dismissKeyboard")

    //Uncomment the line below if you want the tap not not interfere and cancel other interactions.
    //tap.cancelsTouchesInView = false 

    view.addGestureRecognizer(tap)
}

//Calls this function when the tap is recognized.
@objc func dismissKeyboard() {
    //Causes the view (or one of its embedded text fields) to resign the first responder status.
    view.endEditing(true)
}

                                    InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(myEditText.getWindowToken(), 0);