This is not fixed, running this code sample on iOS, announced as "drag"

Code Sample

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("Drag app"),
        ),
        body: HomePage(),
      ),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _HomePageState();
  }
}

class _HomePageState extends State<HomePage> {
  double width = 100.0, height = 100.0;
  Offset position;

  @override
  void initState() {
    super.initState();
    position = Offset(0.0, height - 20);
  }

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: <Widget>[
        Positioned(
          left: position.dx,
          top: position.dy - height + 20,
          child: LongPressDraggable(
            child: Container(
              width: width,
              height: height,
              color: Colors.blue,
              child: Center(
                child: Text(
                  "Drag",
                  style: Theme.of(context).textTheme.headline,
                ),
              ),
            ),
            feedback: Container(
              child: Center(
                child: Text(
                  "Drag",
                  style: Theme.of(context).textTheme.headline,
                ),
              ),
              color: Colors.blue[300],
              width: width,
              height: height,
            ),
            onDraggableCanceled: (Velocity velocity, Offset offset) {
              setState(() => position = offset);
            },
          ),
        ),
      ],
    );
  }
}

flutter doctor -v

[✓] Flutter (Channel dev, 1.21.0-1.0.pre, on Mac OS X 10.15.6 19G73, locale
    en-GB)
    • Flutter version 1.21.0-1.0.pre at /Users/taha/Code/flutter_dev
    • Framework revision f25bd9c55c (3 weeks ago), 2020-07-14 20:26:01 -0400
    • Engine revision 99c2b3a245
    • Dart version 2.9.0 (build 2.9.0-21.0.dev 20bf2fcf56)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.1)
    • Android SDK at /Users/taha/Code/sdk
    • Platform android-30, build-tools 30.0.1
    • ANDROID_HOME = /Users/taha/Code/sdk
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.6)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.6, Build version 11E708
    • CocoaPods version 1.9.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 48.0.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.47.3)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.13.1

 
[✓] Connected device (4 available)            
    • Taha’s iPhone (mobile) • 00008020-001059882212002E • ios            • iOS
      13.6
    • macOS (desktop)        • macos                     • darwin-x64     • Mac
      OS X 10.15.6 19G73
    • Web Server (web)       • web-server                • web-javascript •
      Flutter Tools
    • Chrome (web)           • chrome                    • web-javascript •
      Google Chrome 84.0.4147.105

• No issues found!

Uh oh!

LongPressDraggable doesn't have accessibility semantics for its long press action in iOS #18585

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