255 lines
8.3 KiB
Markdown
255 lines
8.3 KiB
Markdown
# react-native-camera [](http://badge.fury.io/js/react-native-camera)
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A camera module for React Native. **iOS only for now. Looking for help with Android!**
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## Known Issues
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Below is a list of known issues. Pull requests are welcome for any of these issues!
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- Stills captured to disk will not be cleaned up and thus must be managed manually for now
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## Getting started
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1. `npm install react-native-camera@latest --save`
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2. In XCode, in the project navigator, right click `Libraries` ➜ `Add Files to [your project's name]`
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3. Go to `node_modules` ➜ `react-native-camera` and add `RCTCamera.xcodeproj`
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4. In XCode, in the project navigator, select your project. Add `libRCTCamera.a` to your project's `Build Phases` ➜ `Link Binary With Libraries`
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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`.
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5. Run your project (`Cmd+R`)
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## Usage
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All you need is to `require` the `react-native-camera` module and then use the
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`<Camera/>` tag.
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```javascript
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var React = require('react-native');
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var {
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AppRegistry,
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StyleSheet,
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Text,
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View,
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TouchableHighlight
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} = React;
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var Camera = require('react-native-camera');
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var cameraApp = React.createClass({
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getInitialState() {
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return {
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cameraType: Camera.constants.Type.back
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}
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},
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render() {
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return (
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<Camera
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ref="cam"
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style={styles.container}
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onBarCodeRead={this._onBarCodeRead}
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type={this.state.cameraType}
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>
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<Text style={styles.welcome}>
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Welcome to React Native!
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</Text>
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<Text style={styles.instructions}>
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To get started, edit index.ios.js{'\n'}
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Press Cmd+R to reload
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</Text>
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<TouchableHighlight onPress={this._switchCamera}>
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<Text>The old switcheroo</Text>
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</TouchableHighlight>
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<TouchableHighlight onPress={this._takePicture}>
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<Text>Take Picture</Text>
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</TouchableHighlight>
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</Camera>
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);
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},
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_onBarCodeRead(e) {
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console.log(e);
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},
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_switchCamera() {
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var state = this.state;
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state.cameraType = state.cameraType === Camera.constants.Type.back
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? Camera.constants.Type.front : Camera.constants.Type.back;
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this.setState(state);
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},
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_takePicture() {
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this.refs.cam.capture(function(err, data) {
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console.log(err, data);
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});
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}
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});
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var styles = StyleSheet.create({
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container: {
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flex: 1,
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justifyContent: 'center',
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alignItems: 'center',
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backgroundColor: 'transparent',
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},
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welcome: {
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fontSize: 20,
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textAlign: 'center',
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margin: 10,
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},
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instructions: {
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textAlign: 'center',
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color: '#333333',
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},
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});
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AppRegistry.registerComponent('cameraApp', () => cameraApp);
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```
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## Properties
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#### `aspect`
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Values: `Camera.constants.Aspect.fit` or `"fit"`, `Camera.constants.Aspect.fill` or `"fill"` (default), `Camera.constants.Aspect.stretch` or `"stretch"`
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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.
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#### `captureAudio`
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Values: `true` (default), `false` (Boolean)
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*Applies to video capture mode only.* Specifies whether or not audio should be captured with the video.
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#### `captureMode`
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Values: `Camera.constants.CaptureMode.still` (default), `Camera.constants.CaptureMode.video`
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The type of capture that will be performed by the camera - either a still image or video.
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#### `captureTarget`
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Values: `Camera.constants.CaptureTarget.cameraRoll` (default), `Camera.constants.CaptureTarget.disk`, ~~`Camera.constants.CaptureTarget.memory`~~ (deprecated),
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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.
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#### `type`
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Values: `Camera.constants.Type.front` or `"front"`, `Camera.constants.Type.back` or `"back"` (default)
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Use the `type` property to specify which camera to use.
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#### `orientation`
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Values:
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`Camera.constants.Orientation.auto` or `"auto"` (default),
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`Camera.constants.Orientation.landscapeLeft` or `"landscapeLeft"`, `Camera.constants.Orientation.landscapeRight` or `"landscapeRight"`, `Camera.constants.Orientation.portrait` or `"portrait"`, `Camera.constants.Orientation.portraitUpsideDown` or `"portraitUpsideDown"`
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The `orientation` property allows you to specify the current orientation of the phone to ensure the viewfinder is "the right way up."
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#### `onBarCodeRead`
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Will call the specified method when a barcode is detected in the camera's view.
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Event contains `data` (the data in the barcode) and `bounds` (the rectangle which outlines the barcode.)
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The following barcode types can be recognised:
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- `aztec`
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- `code138`
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- `code39`
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- `code39mod43`
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- `code93`
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- `ean13`
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- `ean8`
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- `pdf417`
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- `qr`
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- `upce`
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- `datamatrix` (when available)
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The barcode type is provided in the `data` object.
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#### `flashMode`
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Values:
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`Camera.constants.FlashMode.on`,
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`Camera.constants.FlashMode.off`,
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`Camera.constants.FlashMode.auto`
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Use the `flashMode` property to specify the camera flash mode.
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#### `torchMode`
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Values:
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`Camera.constants.TorchMode.on`,
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`Camera.constants.TorchMode.off`,
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`Camera.constants.TorchMode.auto`
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Use the `torchMode` property to specify the camera torch mode.
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#### `onFocusChanged`
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Args:
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```
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e: {
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nativeEvent: {
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touchPoint: { x, y }
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}
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}
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```
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Will call when touch to focus has been made.
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By default, `onFocusChanged` is not defined and tap-to-focus is disabled.
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#### `defaultOnFocusComponent`
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Values:
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`true` (default)
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`false`
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If `defaultOnFocusComponent` set to false, default internal implementation of visual feedback for tap-to-focus gesture will be disabled.
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#### `onZoomChanged`
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Args:
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```
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e: {
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nativeEvent: {
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velocity, zoomFactor
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}
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}
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```
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Will call when focus has changed.
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By default, `onZoomChanged` is not defined and pinch-to-zoom is disabled.
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## Component methods
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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.
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#### `capture([options,] callback)`
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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.
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Supported options:
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- `audio` (See `captureAudio` under Properties)
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- `mode` (See `captureMode` under Properties)
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- `target` (See `captureTarget` under Properties)
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- `metadata` This is metadata to be added to the captured image.
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- `location` This is the object returned from `navigator.geolocation.getCurrentPosition()` (React Native's geolocation polyfill). It will add GPS metadata to the image.
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- `rotation` This will rotate the image by the number of degrees specified.
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#### `stopCapture()`
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Ends the current capture session for video captures. Only applies when the current `captureMode` is `video`.
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#### `checkDeviceAuthorizationStatus(callback(err, isAuthorized))`
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Exposes the native API for checking if the device has authorized access to the camera. Can be used to call before loading the Camera component to ensure proper UX.
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## Subviews
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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.
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------------
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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.
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