Can't exit from a TextField flutter - ios

Question

I need of a Box where insert and store some informations that comes as user input, I'm using the 'TextField' so I changed the 'maxLines' option in my 'TextField' from default value (1) to (2) and when I want to insert some text here I can't leave the box because the 'Done' button changed to 'return' blocking me! The keyboard is blocked too.
I'm doing this because I would like a Box with some text inside (like a description) that I can move where I want and change all its properties.
My issue is that the textfield writes all in one line, I need of a newline at the border of the textfield.
Do you know how to handle the TextField better?
This is a part of the code :
Widget build(BuildContext context) {
return new Scaffold(
backgroundColor: Colors.white,
body : Container(
decoration: BoxDecoration(
shape: BoxShape.rectangle,
image: DecorationImage(
image: _image == null
? AssetImage('assets/images/io.png')
: FileImage(_image), // here add your image file path,
alignment: Alignment.topCenter,
),
),
child: GestureDetector(
child:Container(
alignment: Alignment.center,
child : ConstrainedBox(
constraints: BoxConstraints(
maxHeight: 400,
maxWidth: 400,
),
child: TextField(
minLines: 1,
maxLines: 2,
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
const Radius.circular(48.0)
),
),
labelText: 'Descrizione',
labelStyle: TextStyle(
backgroundColor: Colors.white,
),
),
),
),
),
)
)
);
P.S.: I'm studying this 'GestureDetector', it should be useful for this purpose I guess.

Answer 1

In the TextField go into InputDecoration and add a Widget to the suffix property . The suffix property is a Widget that shows at the end of the Textfield.
FocusNode node = FocusNode();
TextField(
minLines: 1,
maxLines: 2,
focusNode: node,
decoration: InputDecoration(
suffix: RaisedButton(
onPressed: () {
node.unfocus();
},
child: Text("Done"),
),
border: OutlineInputBorder(
borderRadius:
BorderRadius.all(const Radius.circular(48.0)),
),
labelText: 'Descrizione',
labelStyle: TextStyle(
backgroundColor: Colors.white,
),
),
),