react-native-camera/README.md

# react-native-camera [![npm version](https://badge.fury.io/js/react-native-camera.svg)](http://badge.fury.io/js/react-native-camera)

A camera module for React Native. **iOS only for now. Looking for help with Android!**

![](https://i.imgur.com/5j2JdUk.gif)

## Known Issues
Below is a list of known issues. Pull requests are welcome for any of these issues!

- Stills captured to disk will not be cleaned up and thus must be managed manually for now

## Getting started

1. `npm install react-native-camera@latest --save`
2. In XCode, in the project navigator, right click `Libraries` ➜ `Add Files to [your project's name]`
3. Go to `node_modules` ➜ `react-native-camera` and add `RCTCamera.xcodeproj`
4. In XCode, in the project navigator, select your project. Add `libRCTCamera.a` to your project's `Build Phases` ➜ `Link Binary With Libraries`
5. Click `RCTCamera.xcodeproj` in the project navigator and go the `Build Settings` tab. Make sure 'All' is toggled on (instead of 'Basic'). In the `Search Paths` section, look for `Header Search Paths` and make sure it contains both `$(SRCROOT)/../../react-native/React` and `$(SRCROOT)/../../../React` - mark both as `recursive`.
5. Run your project (`Cmd+R`)

## Usage

All you need is to `require` the `react-native-camera` module and then use the
`<Camera/>` tag.

```javascript
var React = require('react-native');
var {
  AppRegistry,
  StyleSheet,
  Text,
  View,
  TouchableHighlight
} = React;
var Camera = require('react-native-camera');

var cameraApp = React.createClass({
  getInitialState() {
    return {
      cameraType: Camera.constants.Type.back
    }
  },

  render() {

    return (
      <Camera
        ref="cam"
        style={styles.container}
        onBarCodeRead={this._onBarCodeRead}
        type={this.state.cameraType}
      >
        <Text style={styles.welcome}>
          Welcome to React Native!
        </Text>
        <Text style={styles.instructions}>
          To get started, edit index.ios.js{'\n'}
          Press Cmd+R to reload
        </Text>
        <TouchableHighlight onPress={this._switchCamera}>
          <Text>The old switcheroo</Text>
        </TouchableHighlight>
        <TouchableHighlight onPress={this._takePicture}>
          <Text>Take Picture</Text>
        </TouchableHighlight>
      </Camera>
    );
  },
  _onBarCodeRead(e) {
    console.log(e);
  },
  _switchCamera() {
    var state = this.state;
    state.cameraType = state.cameraType === Camera.constants.Type.back
      ? Camera.constants.Type.front : Camera.constants.Type.back;
    this.setState(state);
  },
  _takePicture() {
    this.refs.cam.capture(function(err, data) {
      console.log(err, data);
    });
  }
});


var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: 'transparent',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
  },
});

AppRegistry.registerComponent('cameraApp', () => cameraApp);
```

## Properties

#### `aspect`

Values: `Camera.constants.Aspect.fit` or `"fit"`, `Camera.constants.Aspect.fill` or `"fill"` (default), `Camera.constants.Aspect.stretch` or `"stretch"`

The `aspect` property allows you to define how your viewfinder renders the camera's view. For instance, if you have a square viewfinder and you want to fill the it entirely, you have two options: `"fill"`, where the aspect ratio of the camera's view is preserved by cropping the view or `"stretch"`, where the aspect ratio is skewed in order to fit the entire image inside the viewfinder. The other option is `"fit"`, which ensures the camera's entire view fits inside your viewfinder without altering the aspect ratio.

#### `captureAudio`

Values: `true` (default), `false` (Boolean)

*Applies to video capture mode only.* Specifies whether or not audio should be captured with the video.


#### `captureMode`

Values: `Camera.constants.CaptureMode.still` (default), `Camera.constants.CaptureMode.video`

The type of capture that will be performed by the camera - either a still image or video.

#### `captureTarget`

Values: `Camera.constants.CaptureTarget.cameraRoll` (default), `Camera.constants.CaptureTarget.disk`, ~~`Camera.constants.CaptureTarget.memory`~~ (deprecated),

This property allows you to specify the target output of the captured image data. By default the image binary is sent back as a base 64 encoded string. The disk output has been shown to improve capture response time, so that is the recommended value.


#### `type`

Values: `Camera.constants.Type.front` or `"front"`, `Camera.constants.Type.back` or `"back"` (default)

Use the `type` property to specify which camera to use.


#### `orientation`

Values:
`Camera.constants.Orientation.auto` or `"auto"` (default),
`Camera.constants.Orientation.landscapeLeft` or `"landscapeLeft"`, `Camera.constants.Orientation.landscapeRight` or `"landscapeRight"`, `Camera.constants.Orientation.portrait` or `"portrait"`, `Camera.constants.Orientation.portraitUpsideDown` or `"portraitUpsideDown"`

The `orientation` property allows you to specify the current orientation of the phone to ensure the viewfinder is "the right way up."

#### `onBarCodeRead`

Will call the specified method when a barcode is detected in the camera's view.

Event contains `data` (the data in the barcode) and `bounds` (the rectangle which outlines the barcode.)

The following barcode types can be recognised:

- `aztec`
- `code138`
- `code39`
- `code39mod43`
- `code93`
- `ean13`
- `ean8`
- `pdf417`
- `qr`
- `upce`
- `datamatrix` (when available)

The barcode type is provided in the `data` object.

#### `flashMode`

Values:
`Camera.constants.FlashMode.on`,
`Camera.constants.FlashMode.off`,
`Camera.constants.FlashMode.auto`

Use the `flashMode` property to specify the camera flash mode.

#### `torchMode`

Values:
`Camera.constants.TorchMode.on`,
`Camera.constants.TorchMode.off`,
`Camera.constants.TorchMode.auto`

Use the `torchMode` property to specify the camera torch mode.

#### `onFocusChanged`

Args:
```
e: {
  nativeEvent: {
    touchPoint: { x, y }
  }
}
```
Will call when touch to focus has been made.
By default, `onFocusChanged` is not defined and tap-to-focus is disabled.

#### `defaultOnFocusComponent`

Values:
`true` (default)
`false`

If `defaultOnFocusComponent` set to false, default internal implementation of visual feedback for tap-to-focus gesture will be disabled.

#### `onZoomChanged`

Args:
```
  e: {
    nativeEvent: {
      velocity, zoomFactor
    }
  }
```
Will call when focus has changed.
By default, `onZoomChanged` is not defined and pinch-to-zoom is disabled.

## Component methods

You can access component methods by adding a `ref` (ie. `ref="camera"`) prop to your `<Camera>` element, then you can use `this.refs.camera.capture(cb)`, etc. inside your component.

#### `capture([options,] callback)`

Captures data from the camera. What is captured is based on the `captureMode` and `captureTarget` props. `captureMode` tells the camera whether you want a still image or video. `captureTarget` allows you to specify how you want the data to be captured and sent back to you. See `captureTarget` under Properties to see the available values.

Supported options:

 - `audio` (See `captureAudio` under Properties)
 - `mode` (See  `captureMode` under Properties)
 - `target` (See `captureTarget` under Properties)
 - `metadata` This is metadata to be added to the captured image.
   - `location` This is the object returned from `navigator.geolocation.getCurrentPosition()` (React Native's geolocation polyfill). It will add GPS metadata to the image.
 - `rotation` This will rotate the image by the number of degrees specified.
 
#### `stopCapture()`

Ends the current capture session for video captures. Only applies when the current `captureMode` is `video`.

## Subviews
This component supports subviews, so if you wish to use the camera view as a background or if you want to layout buttons/images/etc. inside the camera then you can do that.

------------

Thanks to Brent Vatne (@brentvatne) for the `react-native-video` module which provided me with a great example of how to set up this module.