Flutter iOS Keyboard Animation

main.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: KeyboardSensitiveView(),
    );
  }
}

class KeyboardSensitiveView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    /// Rebuilt every time the keyboard kicks in and disappears
    final mq = MediaQuery.of(context);
    final bottomOffset = mq.viewInsets.bottom + mq.padding.bottom;
    return Scaffold(
      /// Must disable default scaffold insets (which is not animated)
      resizeToAvoidBottomInset: false,
      appBar: AppBar(title: Text('Keyboard Animation')),
      body: AnimatedContainer(
        curve: Curves.easeOutQuad,
        duration: const Duration(milliseconds: 350),
        margin: EdgeInsets.only(bottom: bottomOffset),
        child: SafeArea(
          /// Adding [SafeArea.bottom] above with " + mq.padding.bottom"
          bottom: false, 
          child: Stack(children: [
            Align(
              alignment: Alignment.bottomLeft,
              child: TextComposer(),
            ),
          ]),
        ),
      ),
    );
  }
}

class TextComposer extends StatefulWidget {
  TextComposer({Key key}) : super(key: key);

  @override
  _TextComposerState createState() => _TextComposerState();
}

class _TextComposerState extends State<TextComposer> {
  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.grey[100],
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        children: [
          SizedBox(
            width: 60,
            child: Icon(Icons.add_a_photo),
          ),
          Flexible(
            child: TextField(
              style: Theme.of(context).textTheme.title,
              decoration: InputDecoration(
                border: InputBorder.none,
                hintText: 'Enter text...',
              ),
            ),
          ),
          SizedBox(
            width: 60,
            child: Icon(Icons.send),
          ),
        ],
      ),
    );
  }
}