samples/platform_design/lib/profile_tab.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

import 'settings_tab.dart';
import 'widgets.dart';

class ProfileTab extends StatelessWidget {
  static const title = 'Profile';
  static const androidIcon = Icon(Icons.person);
  static const iosIcon = Icon(CupertinoIcons.profile_circled);

  Widget _buildBody(BuildContext context) {
    return SafeArea(
      child: Padding(
        padding: const EdgeInsets.all(24.0),
        child: Column(
          children: [
            Padding(
              padding: EdgeInsets.all(8),
              child: Center(
                child: Text(
                  '😼',
                  style: TextStyle(
                    fontSize: 80,
                    decoration: TextDecoration.none,
                  ),
                ),
              ),
            ),
            PreferenceCard(
              header: 'MY INTENSITY PREFERENCE',
              content: '🔥',
              preferenceChoices: [
                'Super heavy',
                'Dial it to 11',
                "Head bangin'",
                '1000W',
                'My neighbor hates me',
              ],
            ),
            PreferenceCard(
              header: 'CURRENT MOOD',
              content: '🤘🏾🚀',
              preferenceChoices: [
                'Over the moon',
                'Basking in sunlight',
                'Hello fellow Martians',
                'Into the darkness',
              ],
            ),
            Expanded(
              child: Container(),
            ),
            LogOutButton(),
          ],
        ),
      ),
    );
  }

  // ===========================================================================
  // Non-shared code below because on iOS, the settings tab is nested inside of
  // the profile tab as a button in the nav bar.
  // ===========================================================================

  Widget _buildAndroid(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: _buildBody(context),
    );
  }

  Widget _buildIos(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: CupertinoNavigationBar(
        trailing: CupertinoButton(
          padding: EdgeInsets.zero,
          child: SettingsTab.iosIcon,
          onPressed: () {
            // This pushes the settings page as a full page modal dialog on top
            // of the tab bar and everything.
            Navigator.of(context, rootNavigator: true).push<void>(
              CupertinoPageRoute(
                title: SettingsTab.title,
                fullscreenDialog: true,
                builder: (context) => SettingsTab(),
              ),
            );
          },
        ),
      ),
      child: _buildBody(context),
    );
  }

  @override
  Widget build(context) {
    return PlatformWidget(
      androidBuilder: _buildAndroid,
      iosBuilder: _buildIos,
    );
  }
}

class PreferenceCard extends StatelessWidget {
  const PreferenceCard({this.header, this.content, this.preferenceChoices});

  final String header;
  final String content;
  final List<String> preferenceChoices;

  @override
  Widget build(context) {
    return PressableCard(
      color: Colors.green,
      flattenAnimation: AlwaysStoppedAnimation(0),
      child: Stack(
        children: [
          Container(
            height: 120,
            width: 250,
            child: Padding(
              padding: EdgeInsets.only(top: 40),
              child: Center(
                child: Text(
                  content,
                  style: TextStyle(fontSize: 48),
                ),
              ),
            ),
          ),
          Positioned(
            top: 0,
            left: 0,
            right: 0,
            child: Container(
              color: Colors.black12,
              height: 40,
              padding: EdgeInsets.only(left: 12),
              alignment: Alignment.centerLeft,
              child: Text(
                header,
                style: TextStyle(
                  color: Colors.white,
                  fontSize: 14,
                  fontWeight: FontWeight.w600,
                ),
              ),
            ),
          ),
        ],
      ),
      onPressed: () {
        showChoices(context, preferenceChoices);
      },
    );
  }
}

class LogOutButton extends StatelessWidget {
  static const _logoutMessage = Text(
      "You can't actually log out! This is just a demo of how alerts work.");

  // ===========================================================================
  // Non-shared code below because this tab shows different interfaces. On
  // Android, it's showing an alert dialog with 2 buttons and on iOS,
  // it's showing an action sheet with 3 choices.
  //
  // This is a design choice and you may want to do something different in your
  // app.
  // ===========================================================================

  Widget _buildAndroid(BuildContext context) {
    return RaisedButton(
      child: Text('LOG OUT', style: TextStyle(color: Colors.red)),
      onPressed: () {
        // You should do something with the result of the dialog prompt in a
        // real app but this is just a demo.
        showDialog<void>(
          context: context,
          builder: (context) {
            return AlertDialog(
              title: Text('Log out?'),
              content: _logoutMessage,
              actions: [
                FlatButton(
                  child: const Text('Got it'),
                  onPressed: () => Navigator.pop(context),
                ),
                FlatButton(
                  child: const Text('Cancel'),
                  onPressed: () => Navigator.pop(context),
                ),
              ],
            );
          },
        );
      },
    );
  }

  Widget _buildIos(BuildContext context) {
    return CupertinoButton(
      color: CupertinoColors.destructiveRed,
      child: Text('Log out'),
      onPressed: () {
        // You should do something with the result of the action sheet prompt
        // in a real app but this is just a demo.
        showCupertinoModalPopup<void>(
          context: context,
          builder: (context) {
            return CupertinoActionSheet(
              title: Text('Log out?'),
              message: _logoutMessage,
              actions: [
                CupertinoActionSheetAction(
                  child: const Text('Reprogram the night man'),
                  isDestructiveAction: true,
                  onPressed: () => Navigator.pop(context),
                ),
                CupertinoActionSheetAction(
                  child: const Text('Got it'),
                  onPressed: () => Navigator.pop(context),
                ),
              ],
              cancelButton: CupertinoActionSheetAction(
                child: const Text('Cancel'),
                isDefaultAction: true,
                onPressed: () => Navigator.pop(context),
              ),
            );
          },
        );
      },
    );
  }

  @override
  Widget build(context) {
    return PlatformWidget(
      androidBuilder: _buildAndroid,
      iosBuilder: _buildIos,
    );
  }
}