Property with 'retain (or strong)' attribute must be of object type

Question

Property with 'retain (or strong)' attribute must be of object type

Closed this issue 4 months ago · 5 comments

Describe the bug
Semantic Issue (Xcode): Property with 'retain (or strong)' attribute must be of object type
SDImageCacheConfig.h:136:0

Could not build the application for the simulator.

Platform

Android
iOS
Web
Desktop

Platform OS version

os 14.3
(simulator) ip14p (mobile) ios • com.apple.CoreSimulator.SimRuntime.iOS-16-4

How are you picking?

onPressed: () async {
        
        FilePickerResult? result = await FilePicker.platform.pickFiles(
          type: FileType.image,
        );
        if (result != null) {
          print(result.files.first);
        }
      },

Details to reproduce the issue
when I hot restart flutter, some bug report as follow

Reloaded 307 of 1007 libraries in 1,759ms (compile: 1355 ms, reload: 135 ms, reassemble: 56 ms).
Restarted application in 446ms.
flutter: [MethodChannelFilePicker] Unsupported operation. Method not found. The exception thrown was: MissingPluginException(No implementation found for method image on channel miguelruivo.flutter.plugins.filepicker)
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: MissingPluginException(No implementation found for method image on channel miguelruivo.flutter.plugins.filepicker)
#0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:332:7)
<asynchronous suspension>
#1      MethodChannel.invokeListMethod (package:flutter/src/services/platform_channel.dart:520:35)
<asynchronous suspension>
#2      FilePickerIO._getPath (package:file_picker/src/file_picker_io.dart:99:33)
<asynchronous suspension>
#3      new _PostCreateFormState.<anonymous closure> (package:flutter_application_1/main.dart:67:36)
<asynchronous suspension>

then flutter clean , pod deintegrate ,pod cache clean --all, rm podfile and flutter pub get, pod install, and build iOS app, I got these

Launching lib/main.dart on ip14p in debug mode...
Xcode build done.                                            3.2s
Failed to build iOS app
Semantic Issue (Xcode): Property with 'retain (or strong)' attribute must be of object type
/test/flutter_application_1/ios/Pods/SDWebImage/SDWebImage/Core/SDImageCacheConfig.h:136:0
SDImageCacheConfig.h:136

Could not build the application for the simulator.
Error launching application on ip14p.

Exited (1).

Error Log
mentioned above

Flutter Version details

$ flutter doctor -v
[✓] Flutter (Channel stable, 3.19.6, on macOS 14.3 23D56 darwin-arm64, locale zh-Hans-CN)
    • Flutter version 3.19.6 on channel stable at /Users/user/development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 54e66469a9 (6 days ago), 2024-04-17 13:08:03 -0700
    • Engine revision c4cd48e186
    • Dart version 3.3.4
    • DevTools version 2.31.1
    • Pub download mirror https://pub.flutter-io.cn
    • Flutter download mirror https://storage.flutter-io.cn

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/user/Library/Android/sdk/
    • Platform android-34, build-tools 34.0.0
    • ANDROID_HOME = /Users/user/Library/Android/sdk/
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.9+0-17.0.9b1087.7-11185874)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15E204a
    • CocoaPods version 1.15.2

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

[✓] Android Studio (version 2023.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.9+0-17.0.9b1087.7-11185874)

[✓] VS Code (version 1.88.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.86.0

[✓] Connected device (3 available)
    • ip14p (mobile)  • • ios            • com.apple.CoreSimulator.SimRuntime.iOS-16-4 (simulator)
    • macOS (desktop) • macos                                • darwin-arm64   • macOS 14.3 23D56 darwin-arm64
    • Chrome (web)    • chrome                               • web-javascript • Google Chrome 119.0.6045.123

[✓] Network resources
    • All expected network resources are available.

• No issues found!

Answer 1 · 2024-04-23T14:33:28.000Z

main.dart as these

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body:  SingleChildScrollView(
      child: Container(
        padding: EdgeInsets.all(16),
        child: SafeArea(
          child: PostCreateForm(),
        ),
      ),
    ),// This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}


class PostCreateForm extends StatefulWidget {
  @override
  State<PostCreateForm> createState() => _PostCreateFormState();
}

class _PostCreateFormState extends State<PostCreateForm> {

  final formKey = GlobalKey<FormState>();

  final meidabutton = Container(
    child: TextButton(
      child: Text('upload file'),
      style: TextButton.styleFrom(
        textStyle: TextStyle(fontSize: 20),
        minimumSize: Size(double.infinity, 60),
      ),
      onPressed: () async {
        
        FilePickerResult? result = await FilePicker.platform.pickFiles(
          type: FileType.image,
        );
        if (result != null) {
          print(result.files.first);
        }
      },
    ),
  );

  @override
  Widget build(BuildContext context) {
    return Form(
      key: formKey,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          meidabutton,
        ],
      ),
    );
  }
}

Answer 2 · 2024-04-27T08:10:46.000Z

SDWebImage is one of file_picker 's transitive dependencies, through DKImagePickerController.

Answer 3 · 2024-04-27T08:30:18.000Z

Thank you very much for your reply, before I suspected that my Apple laptop system version might be too high, and I installed anoconda, which may have polluted the environment variables, so I reinstalled the system, reconfigured the environment variables, and just now I tried to run my script, and found that it finally works perfectly. Thank you again

Answer 4 · 2024-05-05T01:46:52.000Z

This issue is stale because it has been open for 7 days with no activity.

Answer 5 · 2024-05-19T01:48:46.000Z

This issue was closed because it has been inactive for 14 days since being marked as stale.