Introduction

I am trying to figure out how to integrate huggingface into my Flutter app. Here is my attempt at figuring that out.

Setup

Pre-requisites

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

source $HOME/.cargo/env

brew install llvm

rustup target add aarch64-apple-ios x86_64-apple-ios
rustup target add aarch64-apple-ios-sim

Rust

cargo install flutter_rust_bridge_codegen cbindgen
dart pub global activate ffigen
# if building for iOS or MacOS
cargo install cargo-xcode

flutter pub add flutter_rust_bridge
# if using Dart codegen
flutter pub add -d build_runner
flutter pub add -d freezed
flutter pub add freezed_annotation

Integrating with an existing project

Where $crate is the name of the crate. Set it by running crate=somenamehere

crate=cortex
# At the root flutter project, create a crate
cargo new --lib $crate

Add this to Cargo.toml:

[dependencies]
flutter_rust_bridge = "1"

[lib]
crate-type = ["lib", "staticlib", "cdylib"]

Then use cargo to generate an Xcode project within $crate. You will add this as a sub-project for the ios/Runner.xcodeproj.

cd $crate
cargo xcode

iOS setup

open ios/Runner.xcodeproj

Then drag the $crate/$crate.xcodeproj under the Runner folder in the Xcode sidebar.

Then click on the top Runner item in the sidebar -> Build Phases.

Under Targets -> Runner -> Dependencies, add the $crate-staticlib .

Under Link Binary With Libraries -> add lib$crate_static.a.

Then run:

flutter_rust_bridge_codegen \
    -r $crate/src/api.rs \
    -d lib/bridge_generated.dart \
    -c ios/Runner/bridge_generated.h
# if building for MacOS
cp ios/Runner/bridge_generated.h macos/Runner/bridge_generated.h

Libraries

References

Metadata