[pigeon] argument is neither an Objective-C object nor a block type #93525
Description
Steps to Reproduce
- Define an enum
YourEnum - Define a class
YourObjectwith aMap<YourEnum?,String?>field - Define a pigeon API with a method that takes
YourObjectas input - Run pigeon to generate the code
- Run
flutter build ios - Error: Xcode can't build because of the enum as key of Map
You can also check this repository with a sample app:
- Clone the repo
- Run
flutter build ios
Expected results: I expected to use a Map with enum as key
Actual results: The Map generates a build error in Xcode
Code sample
Pigeon API definition:
enum MessageKey {
title,
subtitle,
description,
}
class Message {
int? id;
Map<MessageKey?, String?>? additionalProperties;
}
@HostApi()
abstract class HostApiBridge {
void sendMessage(Message message);
}A working sample is available in this repository.
Logs
Xcode's output:
↳
In file included from
/Users/your.name/mydev/pigeon_issue_example/ios/Runner/HostApi.m:3:
/Users/your.name/mydev/pigeon_issue_example/ios/Runner/HostApi.h:21:53: error: type
argument 'MessageKey *' (aka 'enum MessageKey *') is neither an Objective-C object nor a block type
@property(nonatomic, strong, nullable) NSDictionary<MessageKey *, NSString *> * additionalProperties;
^~~~~~~~~~~~
1 error generated.
note: Using new build system
note: Building targets in parallel
note: Planning build
note: Constructing build description
Flutter Analyze:
Analyzing pigeon_issue_example...
No issues found! (ran in 2.6s)
Flutter Doctor:
[✓] Flutter (Channel stable, 2.5.2, on macOS 11.6.1 20G224 darwin-x64, locale en-GB)
• Flutter version 2.5.2 at /Users/gianluca.paradiso/flutter-sdk/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 3595343e20 (6 weeks ago), 2021-09-30 12:58:18 -0700
• Engine revision 6ac856380f
• Dart version 2.14.3
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at /Users/gianluca.paradiso/Library/Android/sdk
• Platform android-30, build-tools 30.0.3
• ANDROID_HOME = /Users/gianluca.paradiso/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.4, Build version 12D4e
• CocoaPods version 1.11.2
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 4.2)
• 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 11.0.8+10-b944.6916264)
[✓] IntelliJ IDEA Ultimate Edition (version 2020.3.2)
• IntelliJ at /Applications/IntelliJ IDEA.app
• 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
[✓] VS Code (version 1.62.0)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.28.0
[✓] Connected device (2 available)
• Nexus 5X (mobile) • 02628c9c66bfd34f • android-arm64 • Android 8.1.0 (API 27)
• Chrome (web) • chrome • web-javascript • Google Chrome 95.0.4638.69
• No issues found!