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# it's important to not forget the release flag.
cargo lipo --release

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cd rust
cbindgen src/lib.rs -l c > rustylib.h

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# install the Xcode build tools. 
xcode-select --install
# this cargo subcommand will help you create a universal library for use with iOS. 
cargo install cargo-lipo 
# this tool will let you automatically create the C/C++11 headers of the library. 
cargo install cbindgen

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# Android targets
rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android
# iOS targets 
rustup target add aarch64-apple-ios armv7-apple-ios armv7s-apple-ios x86_64-apple-ios i386-apple-ios

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cd rust
cargo init - name rustylib - lib

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mkdir rust-for-android-ios-flutter 
cd rust-for-android-ios-flutter 
mkdir ios android rust flutter

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

import 'package:flutter/services.dart';
import 'package:rusty_flutter_lib/rusty_flutter_lib.dart';

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

class MyApp extends StatefulWidget {
  @override

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import Flutter
import UIKit

public class SwiftRustyFlutterLibPlugin: NSObject, FlutterPlugin {
  public static func register(with registrar: FlutterPluginRegistrar) {
    let channel = FlutterMethodChannel(name: "rusty_flutter_lib", binaryMessenger: registrar.messenger())
    let instance = SwiftRustyFlutterLibPlugin()
    registrar.addMethodCallDelegate(instance, channel: channel)
  }

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package com.robertohuertas.rusty_flutter_lib

// importing the Android library
import com.robertohuertas.rusty_android_lib.*

import io.flutter.plugin.common.MethodCall
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugin.common.MethodChannel.MethodCallHandler
import io.flutter.plugin.common.MethodChannel.Result
import io.flutter.plugin.common.PluginRegistry.Registrar

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package com.robertohuertas.rusty_android

import android.os.Bundle
import com.google.android.material.snackbar.Snackbar
import androidx.appcompat.app.AppCompatActivity
import android.view.Menu
import android.view.MenuItem
import android.widget.TextView

import kotlinx.android.synthetic.main.activity_main.*