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Pacote do SQLite

Adicione o pacote sqlite-net-pcl e suas dependências:

Linha RM > 3 - Adicionando Pacotes > image2022-9-20_18-25-57.png

Lista de pacotes após inseridos:

<PackageReference Include="sqlite-net-pcl" Version="1.8.116" />
<PackageReference Include="SQLitePCLRaw.bundle_green" Version="2.1.2" />
<PackageReference Include="SQLitePCLRaw.core" Version="2.1.2" />
<PackageReference Include="SQLitePCLRaw.provider.dynamic_cdecl" Version="2.1.2" />
<PackageReference Include="SQLitePCLRaw.provider.sqlite3" Version="2.1.2" />

No iOS é necessário definir o provedor do SQLite no arquivo AppDelegate.cs:

protected override MauiApp CreateMauiApp()
{
    raw.SetProvider(new SQLite3Provider_sqlite3());
    return MauiProgram.CreateMauiApp();
}

Pacote do Firebase

Adicione o pacote Plugin.Firebase ( >= 1.2.0) no nuget. Depois os arquivos GoogleService-Info.plist e google-services.json à pasta raiz do projeto e inclua-os no arquivo .csproj dessa forma:

<ItemGroup Condition="'$(TargetFramework)' == 'net6.0-android'">
    <GoogleServicesJson Include="google-services.json" />
</ItemGroup>

<ItemGroup Condition="'$(TargetFramework)' == 'net6.0-ios'">
    <BundleResource Include="GoogleService-Info.plist" />
</ItemGroup>

Coloque a chamada de inicialização no arquivo MauiProgram.cs (linha 15):

#if IOS
using Plugin.Firebase.iOS;
#else
using Plugin.Firebase.Android;
#endif

public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        return MauiApp
            .CreateBuilder()
            .UseMauiApp<App>()
            ...
            .RegisterFirebaseServices()
            .Build();
    }
    
    private static MauiAppBuilder RegisterFirebaseServices(this MauiAppBuilder builder)
    {
        builder.ConfigureLifecycleEvents(events => {
#if IOS
            events.AddiOS(iOS => iOS.FinishedLaunching((app, launchOptions) => {
                CrossFirebase.Initialize(app, launchOptions, CreateCrossFirebaseSettings());
                return false;
            }));
#else
            events.AddAndroid(android => android.OnCreate((activity, state) =>
                CrossFirebase.Initialize(activity, state, CreateCrossFirebaseSettings())));
#endif
        });
        
        builder.Services.AddSingleton(_ => CrossFirebaseAuth.Current);
        return builder;
    }
    
    private static CrossFirebaseSettings CreateCrossFirebaseSettings()
    {
        return new CrossFirebaseSettings(isAuthEnabled: true);
    }
}

Adicione o seguinte ItemGroup ao arquivo .csproj para evitar erros de compilação:

<ItemGroup Condition="'$(TargetFramework)' == 'net6.0-android'">
  <PackageReference Include="Xamarin.Kotlin.StdLib.Jdk7" Version="1.7.10" ExcludeAssets="build;buildTransitive" />
  <PackageReference Include="Xamarin.Kotlin.StdLib.Jdk8" Version="1.7.10" ExcludeAssets="build;buildTransitive" />
</ItemGroup>