react-native-i18n/README.md

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# react-native-i18n

Integrates [I18n.js](https://github.com/fnando/i18n-js) with React Native. Uses the user preferred locale as default.
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## Installation

**Using npm**

`$ npm install react-native-i18n --save`

**Using yarn**

`$ yarn add react-native-i18n`

## Automatic setup

After installing the npm package you need to link the native modules.

If you're using React-Native < 0.29, install [rnpm](https://github.com/rnpm/rnpm) with the command `npm install -g rnpm` and then link the library with the command `rnpm link`.
If you're using React-Native >= 0.29 just link the library with the command `react-native link`.

If you're having any issue you can also try to install the library manually as follows.

## Manual setup

### iOS

Add `RNI18n.xcodeproj` to **Libraries** and add `libRNI18n.a` to **Link Binary With Libraries** under **Build Phases**.  
[More info and screenshots about how to do this is available in the React Native documentation](http://facebook.github.io/react-native/docs/linking-libraries-ios.html#content).

You also need to add the **localizations** you intend to support to your iOS project. To do that open your Xcode project:

```
$ open <your-project>.xcodeproj
```

And add the localizations you will support as shown here:

![adding locales](docs/adding-locales.png)

### Android

Add `react-native-i18n` to your `./android/settings.gradle` file as follows:

```
include ':app', ':react-native-i18n'
project(':react-native-i18n').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-i18n/android')
```

Include it as dependency in `./android/app/build.gradle` file:

```
dependencies {
    ...
    compile project(':react-native-i18n')
}
```

Finally, you need to add the package to your MainApplication (`./android/app/src/main/java/your/bundle/MainApplication.java`):

```java
import com.AlexanderZaytsev.RNI18n.RNI18nPackage; // <-- Add to ReactNativeI18n to the imports

...

@Override
protected List<ReactPackage> getPackages() {
    return Arrays.<ReactPackage>asList(
        new MainReactPackage(),
        ...
        new RNI18nPackage(), // <-- Add it to the packages list
        ...
    );
}

...

```

After that, you will need to recompile your project with `react-native run-android`.

**Note: You'll need to install Android build tools 25.0.2**

## Usage
```javascript
import I18n from 'react-native-i18n'

class Demo extends React.Component {
  render () {
    return (
      <Text>{I18n.t('greeting')}</Text>
    )
  }
}

// Enable fallbacks if you want `en-US` and `en-GB` to fallback to `en`
I18n.fallbacks = true

I18n.translations = {
  en: {
    greeting: 'Hi!'
  },
  fr: {
    greeting: 'Bonjour!'
  }
}
```

This will render `Hi!` for devices with the English locale, and `Bonjour!` for devices with the French locale.

## Usage with multiple location files

```javascript
// app/i18n/locales/en.js

export default {  
  greeting: 'Hi!'
};

// app/i18n/locales/fr.js

export default {  
  greeting: 'Bonjour!'
};

// app/i18n/i18n.js

import I18n from 'react-native-i18n';
import en from './locales/en';
import fr from './locales/fr';  

I18n.fallbacks = true;

I18n.translations = {
  en,
  fr
};

export default I18n; 

// usage in component

import I18n from 'app/i18n/i18n';

class Demo extends React.Component {
  render () {
    return (
      <Text>{I18n.t('greeting')}</Text>
    )
  }
}
```

### Fallbacks
When fallbacks are enabled (which is generally recommended), `i18n.js` will try to look up translations in the following order (for a device with `en_US` locale):
- en-US
- en

**Note**: iOS 8 locales use underscored (`en_US`) but `i18n.js` locales are dasherized (`en-US`). This conversion is done automatically for you.

```js
I18n.fallbacks = true

I18n.translations = {
  'en': {
    greeting: 'Hi!'
  },
  'en-GB': {
    greeting: 'Hi from the UK!'
  }
}
```

For a device with a `en_GB` locale this will return `Hi from the UK!'`, for a device with a `en_US` locale it will return `Hi!`.

### Device's locale

You can get the user preferred locales with the `RNI18n` native module:

```js
import { getLanguages } from 'react-native-i18n'

getLanguages().then(languages => {
  console.log(languages)
})
```

Returns `['en-US', 'en']`.


### I18n.js documentation

For more info about I18n.js methods (`localize`, `pluralize`, etc) and settings see [its documentation](https://github.com/fnando/i18n-js#setting-up).

## Licence

MIT