Create plugin with protobuf support

Create project:

flutter create -t plugin -i swift -a kotlin plugin_with_protobuf

Quick check: cd plugin_with_protobuf/example flutter run

Prepare protobuf

brew install protobuf brew install swift-protobuf

brew tap dart-lang/dart brew install dart pub global activate protoc_plugin

Edit bash_profile

export PATH=$PATH:~/flutter/bin: ~/.pub-cache/bin

Prepare IDE

Android Studio: Protobuf Support VSCode: vscode-proto3

Create protos folder in plugin

• Create person.proto file

Gen dart code:

protoc --dart_out=./lib/gen ./protos/person.proto

Adding dependencies in pubspec.yaml

dependencies: protobuf: any

Generate swift code

protoc --swift_out=./ios/Classes ./protos/person.proto

then modify podspec for iOS project at: ios/plugin_with_protobuf.podspec Adding:

• s.dependency 'SwiftProtobuf', '~> 1.4'
• s.ios.deployment_target = '9.0'

Sending data from iOS to Flutter

Right click on iOS -> Flutter -> Open iOS module in XCode

Method channel should be in SwiftPluginWithProtobufPlugin.swift Search for that file -> see PluginWithProtobufPlugin.m

Implement Swift method

Implement Dart to call Swift method, easy can be done via Xcode

plugin_with_protobuf/ios/Classes/SwiftPluginWithProtobufPlugin.swift

Adding support in Android Gradle file

• Try to run on Android simulator/device to test Gradle build file
• Implement in Kotlin, can open Android Studio project in another window plugin_with_protobuf/android/src/main/kotlin/com/example/plugin_with_protobuf/PluginWithProtobufPlugin.kt