# react-native: Internazionalizza un mini shop
URL: https://generaltranslation.com/it/docs/react-native/tutorials/mini-shop.mdx
---
title: Internazionalizza un mini shop
description: Un tutorial pratico di React Native per internazionalizzare un semplice negozio con componenti, Hook e stringhe condivise di GT React Native
---

<Callout type="warn">
  `gt-react-native` è ancora sperimentale e potrebbe non funzionare in tutti i progetti.
  Se riscontri problemi, faccelo sapere [aprendo una issue su GitHub](https://github.com/generaltranslation/gt/issues).
</Callout>

Crea ed esegui un piccolo &quot;mini shop&quot; interamente locale e tradotto in React Native — senza servizi esterni, senza routing e senza framework UI oltre a Expo. Userai da cima a fondo le funzionalità principali di GT React Native e vedrai come si combinano in una semplice interfaccia mobile realistica.

Prerequisiti: React Native (Expo), JavaScript/TypeScript di base

Cosa realizzerai

* Un &quot;negozio&quot; a schermata singola con un elenco di prodotti e un semplice carrello in memoria
* Selettore della lingua ed etichette di navigazione condivise
* Numeri, valuta e pluralizzazione correttamente internazionalizzati

Link usati in questo tutorial

* Provider: [`<GTProvider>`](/docs/react-native/api/components/gtprovider)
* Componenti: [`<T>`](/docs/react-native/api/components/t), [`<Var>`](/docs/react-native/api/components/var), [`<Num>`](/docs/react-native/api/components/num), [`<Currency>`](/docs/react-native/api/components/currency), [`<DateTime>`](/docs/react-native/api/components/datetime), [`<Branch>`](/docs/react-native/api/components/branch), [`<Plural>`](/docs/react-native/api/components/plural), [`<LocaleSelector>`](/docs/react-native/api/components/locale-selector)
* Stringhe e stringhe condivise: [`useGT`](/docs/react-native/api/strings/use-gt), [`msg`](/docs/react-native/api/strings/msg), [`useMessages`](/docs/react-native/api/strings/use-messages)
* Guide: [Variabili](/docs/react-native/guides/variables), [Branching](/docs/react-native/guides/branches), [Stringhe](/docs/react-native/guides/strings), [Archiviazione locale delle traduzioni](/docs/react-native/guides/local-tx), [cambiare lingua](/docs/react-native/guides/languages)

***

## Installa e configura la tua app

Installa i pacchetti e configura la tua app con il provider.

<Tabs items={['npm', 'yarn', 'bun', 'pnpm']}>
  <Tab value="npm">
    ```bash
    npm i gt-react-native
    npm i --save-dev gt
    ```
  </Tab>

  <Tab value="yarn">
    ```bash
    yarn add gt-react-native
    yarn add --dev gt
    ```
  </Tab>

  <Tab value="bun">
    ```bash
    bun add gt-react-native
    bun add --dev gt
    ```
  </Tab>

  <Tab value="pnpm">
    ```bash
    pnpm add gt-react-native
    pnpm add --save-dev gt
    ```
  </Tab>
</Tabs>

<Callout>
  Facoltativo: progetto iniziale (Expo)

  Se parti da zero, genera un&#39;app Expo e poi installa i pacchetti GT:

  ```bash copy
  npx create-expo-app mini-shop --template blank-typescript
  cd mini-shop
  npm i gt-react-native
  npm i --save-dev gt
  ```

  Poi aggiungi i file nelle sezioni seguenti (ad esempio `App.tsx`, `components/*`, `data.ts`, `nav.ts`).
</Callout>

Crea una configurazione minima del provider.

```tsx title="App.tsx" copy
import { GTProvider } from 'gt-react-native';
import Shop from './Shop';

export default function App() {
  return (
    <GTProvider locales={["es", "fr"]}>
      <Shop />
    </GTProvider>
  );
}
```

Facoltativamente, aggiungi ora un file `gt.config.json` (sarà utile più avanti per la CI e l&#39;archiviazione locale):

```json title="gt.config.json" copy
{
  "defaultLocale": "en",
  "locales": ["es", "fr"]
}
```


### API key di sviluppo

Puoi seguire questo tutorial anche senza API key (verrà visualizzata la lingua predefinita). Per vedere le traduzioni in tempo reale e testare il cambio di lingua in fase di sviluppo, aggiungi le API key di sviluppo.

Scopri di più in [Produzione vs sviluppo](/docs/react-native/concepts/environments).

<Tabs items={["Expo (sviluppo)", "Ottieni le API key"]}>
  <Tab value="Expo (sviluppo)">
    ```bash title=".env" copy
    EXPO_PUBLIC_GT_API_KEY="your-dev-api-key"
    EXPO_PUBLIC_GT_PROJECT_ID="your-project-id"
    ```
  </Tab>

  <Tab value="Ottieni le API key">
    * Dashboard: https://dash.generaltranslation.com/signup
    * Oppure tramite CLI:
      ```bash copy
      npx gt auth
      ```
  </Tab>
</Tabs>

***

## Dati iniziali e struttura dell&#39;app

Definiremo direttamente nel codice un piccolo array di prodotti e lasceremo tutto lato client. Niente server, niente navigazione.

```ts title="data.ts" copy
export type Product = {
  id: string;
  name: string;
  description: string;
  price: number;
  currency: 'USD' | 'EUR';
  inStock: boolean;
  addedAt: string; // stringa di data ISO
};

export const products: Product[] = [
  {
    id: 'p-1',
    name: 'Wireless Headphones',
    description: 'Noise-cancelling over-ear design with 30h battery',
    price: 199.99,
    currency: 'USD',
    inStock: true,
    addedAt: new Date().toISOString()
  },
  {
    id: 'p-2',
    name: 'Travel Mug',
    description: 'Double-wall insulated stainless steel (12oz)',
    price: 24.5,
    currency: 'USD',
    inStock: false,
    addedAt: new Date().toISOString()
  }
];
```

***


## Etichette di navigazione condivise con msg e useMessages

Usa [`msg`](/docs/react-native/api/strings/msg) per marcare le stringhe condivise nella configurazione, quindi decodificale con [`useMessages`](/docs/react-native/api/strings/use-messages) al momento del rendering.

```tsx title="nav.ts" copy
import { msg } from 'gt-react-native';

export const navItems = [
  { label: msg('Home'), id: 'home' },
  { label: msg('Products'), id: 'products' },
  { label: msg('Cart'), id: 'cart' }
];
```

```tsx title="components/Header.tsx" copy
import { View, Text, StyleSheet } from 'react-native';
import { LocaleSelector, T } from 'gt-react-native';
import { useMessages } from 'gt-react-native';
import { navItems } from '../nav';

export default function Header() {
  const m = useMessages();
  return (
    <View style={styles.header}>
      <T><Text style={styles.title}>Mini Shop</Text></T>
      <View style={styles.nav}>
        {navItems.map(item => (
          <Text key={item.id} style={styles.navItem}>
            {m(item.label)}
          </Text>
        ))}
      </View>
      <LocaleSelector />
    </View>
  );
}

const styles = StyleSheet.create({
  header: {
    paddingVertical: 16,
    paddingHorizontal: 12,
    borderBottomWidth: 1,
    borderBottomColor: '#eee',
  },
  title: {
    fontSize: 24,
    fontWeight: 'bold',
    marginBottom: 8,
  },
  nav: {
    flexDirection: 'row',
    gap: 12,
    marginBottom: 8,
  },
  navItem: {
    fontSize: 14,
    color: '#555',
  },
});
```

***


## Schede prodotto con T, variabili, Branch e Currency

Usa [`<T>`](/docs/react-native/api/components/t) per tradurre JSX. Avvolgi i contenuti dinamici con componenti variabili come [`<Var>`](/docs/react-native/api/components/var), [`<Num>`](/docs/react-native/api/components/num), [`<Currency>`](/docs/react-native/api/components/currency) e [`<DateTime>`](/docs/react-native/api/components/datetime). Gestisci lo stato delle scorte tramite [`<Branch>`](/docs/react-native/api/components/branch).

```tsx title="components/ProductCard.tsx" copy
import { View, Text, TouchableOpacity, StyleSheet } from 'react-native';
import { T, Var, Currency, DateTime, Branch } from 'gt-react-native';
import type { Product } from '../data';

export default function ProductCard({ product, onAdd }: { product: Product; onAdd: () => void }) {
  return (
    <View style={styles.card}>
      <T>
        <Text style={styles.name}><Var>{product.name}</Var></Text>
        <Text style={styles.description}><Var>{product.description}</Var></Text>
        <Text style={styles.price}>
          Price: <Currency currency={product.currency}>{product.price}</Currency>
        </Text>
        <Text style={styles.date}>
          Added: <DateTime options={{ dateStyle: 'medium', timeStyle: 'short' }}>{product.addedAt}</DateTime>
        </Text>
        <Branch
          branch={product.inStock}
          true={<Text style={styles.inStock}>In stock</Text>}
          false={<Text style={styles.outOfStock}>Out of stock</Text>}
        />
      </T>
      <TouchableOpacity
        style={[styles.button, !product.inStock && styles.buttonDisabled]}
        onPress={onAdd}
        disabled={!product.inStock}
      >
        <Text style={styles.buttonText}>Add to cart</Text>
      </TouchableOpacity>
    </View>
  );
}

const styles = StyleSheet.create({
  card: {
    borderWidth: 1,
    borderColor: '#ddd',
    borderRadius: 8,
    padding: 12,
    marginBottom: 12,
  },
  name: {
    fontSize: 18,
    fontWeight: '600',
    marginBottom: 4,
  },
  description: {
    fontSize: 14,
    color: '#666',
    marginBottom: 8,
  },
  price: {
    fontSize: 16,
    marginBottom: 4,
  },
  date: {
    fontSize: 12,
    color: '#999',
    marginBottom: 8,
  },
  inStock: {
    color: 'green',
    marginBottom: 8,
  },
  outOfStock: {
    color: 'tomato',
    marginBottom: 8,
  },
  button: {
    backgroundColor: '#007AFF',
    paddingVertical: 10,
    borderRadius: 6,
    alignItems: 'center',
  },
  buttonDisabled: {
    backgroundColor: '#ccc',
  },
  buttonText: {
    color: '#fff',
    fontWeight: '600',
  },
});
```

***


## Carrello con pluralizzazione e totali

Usa [`<Plural>`](/docs/react-native/api/components/plural) per indicare &quot;X articoli nel carrello&quot; e [`<Currency>`](/docs/react-native/api/components/currency) per i totali. Combinali con [`<T>`](/docs/react-native/api/components/t), [`<Var>`](/docs/react-native/api/components/var) e [`<Num>`](/docs/react-native/api/components/num).

```tsx title="components/Cart.tsx" copy
import { View, Text, TouchableOpacity, StyleSheet } from 'react-native';
import { T, Plural, Var, Num, Currency } from 'gt-react-native';
import type { Product } from '../data';

export default function Cart({ items, onClear }: { items: Product[]; onClear: () => void }) {
  const total = items.reduce((sum, p) => sum + p.price, 0);
  const itemCount = items.length;
  return (
    <View style={styles.container}>
      <T>
        <Text style={styles.heading}>Cart</Text>
        <Plural
          n={itemCount}
          zero={<Text style={styles.empty}>Your cart is empty</Text>}
          one={<Text>You have <Num>{itemCount}</Num> item</Text>}
          other={<Text>You have <Num>{itemCount}</Num> items</Text>}
        />
        {items.map((p) => (
          <Text key={p.id} style={styles.item}>
            <Var>{p.name}</Var> — <Currency currency={p.currency}>{p.price}</Currency>
          </Text>
        ))}
        <Text style={styles.total}>
          Total: <Currency currency={items[0]?.currency || 'USD'}>{total}</Currency>
        </Text>
      </T>
      <TouchableOpacity
        style={[styles.button, itemCount === 0 && styles.buttonDisabled]}
        onPress={onClear}
        disabled={itemCount === 0}
      >
        <Text style={styles.buttonText}>Clear cart</Text>
      </TouchableOpacity>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    borderTopWidth: 1,
    borderTopColor: '#eee',
    paddingTop: 16,
    marginTop: 16,
  },
  heading: {
    fontSize: 20,
    fontWeight: 'bold',
    marginBottom: 8,
  },
  empty: {
    color: '#999',
    marginBottom: 8,
  },
  item: {
    fontSize: 14,
    marginVertical: 4,
  },
  total: {
    fontSize: 16,
    fontWeight: '600',
    marginTop: 8,
    marginBottom: 12,
  },
  button: {
    backgroundColor: '#FF3B30',
    paddingVertical: 10,
    borderRadius: 6,
    alignItems: 'center',
  },
  buttonDisabled: {
    backgroundColor: '#ccc',
  },
  buttonText: {
    color: '#fff',
    fontWeight: '600',
  },
});
```

***


## Attributi e segnaposto con `useGT`

Usa [`useGT`](/docs/react-native/api/strings/use-gt) per tradurre stringhe semplici, come i segnaposto dei campi di input e le etichette di accessibilità.

```tsx title="components/Search.tsx" copy
import { TextInput, StyleSheet } from 'react-native';
import { useGT } from 'gt-react-native';

export default function Search({ onQuery }: { onQuery: (q: string) => void }) {
  const gt = useGT();
  return (
    <TextInput
      placeholder={gt('Search products...')}
      accessibilityLabel={gt('Search input')}
      onChangeText={onQuery}
      style={styles.input}
    />
  );
}

const styles = StyleSheet.create({
  input: {
    borderWidth: 1,
    borderColor: '#ddd',
    borderRadius: 8,
    padding: 10,
    fontSize: 16,
  },
});
```

***


## Mettiamo tutto insieme

Un&#39;app a schermata singola con carrello in memoria e un semplice filtro di ricerca.

```tsx title="Shop.tsx" copy
import { useMemo, useState } from 'react';
import { SafeAreaView, ScrollView, View, StyleSheet } from 'react-native';
import Header from './components/Header';
import Search from './components/Search';
import ProductCard from './components/ProductCard';
import Cart from './components/Cart';
import { products } from './data';

export default function Shop() {
  const [query, setQuery] = useState('');
  const [cart, setCart] = useState<string[]>([]);

  const filtered = useMemo(() => {
    const q = query.toLowerCase();
    return products.filter(p =>
      p.name.toLowerCase().includes(q) || p.description.toLowerCase().includes(q)
    );
  }, [query]);

  const items = products.filter(p => cart.includes(p.id));

  return (
    <SafeAreaView style={styles.safe}>
      <ScrollView contentContainerStyle={styles.scroll}>
        <Header />
        <View style={styles.searchContainer}>
          <Search onQuery={setQuery} />
        </View>
        <View style={styles.products}>
          {filtered.map(p => (
            <ProductCard
              key={p.id}
              product={p}
              onAdd={() => setCart(c => (p.inStock ? [...new Set([...c, p.id])] : c))}
            />
          ))}
        </View>
        <Cart
          items={items}
          onClear={() => setCart([])}
        />
      </ScrollView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safe: {
    flex: 1,
    backgroundColor: '#fff',
  },
  scroll: {
    padding: 16,
  },
  searchContainer: {
    marginVertical: 12,
  },
  products: {
    gap: 0,
  },
});
```

***


## Esegui localmente

Avvia il server di sviluppo di Expo:

```bash
npx expo start
```

Poi apri l&#39;app Expo Go sul telefono oppure premi `i` per il simulatore iOS / `a` per l&#39;emulatore Android.

***


## Cosa hai imparato

* A tradurre JSX con [`<T>`](/docs/react-native/api/components/t) e a gestire i contenuti dinamici tramite [`<Var>`](/docs/react-native/api/components/var), [`<Num>`](/docs/react-native/api/components/num), [`<Currency>`](/docs/react-native/api/components/currency), [`<DateTime>`](/docs/react-native/api/components/datetime)
* A esprimere contenuti condizionali con [`<Branch>`](/docs/react-native/api/components/branch) e quantità con [`<Plural>`](/docs/react-native/api/components/plural)
* A tradurre gli attributi con [`useGT`](/docs/react-native/api/strings/use-gt)
* A condividere stringhe di navigazione/configurazione usando [`msg`](/docs/react-native/api/strings/msg) e a decodificarle con [`useMessages`](/docs/react-native/api/strings/use-messages)
* A cambiare lingua con [`<LocaleSelector>`](/docs/react-native/api/components/locale-selector)

## Prossimi passi

* Esplora: [Guida alle variabili](/docs/react-native/guides/variables), [Guida ai branch](/docs/react-native/guides/branches), [Guida alle stringhe](/docs/react-native/guides/strings), [Cambiare lingua](/docs/react-native/guides/languages)