index.js

import React from 'react'
import PropTypes from 'prop-types'
import {
  View,
  Image,
  StyleSheet,
  TouchableOpacity,
  Platform
} from 'react-native'
import ImagePicker from 'react-native-image-picker'
import ImageResizer from 'react-native-image-resizer'
import RNFS from 'react-native-fs'

export default class PhotoUpload extends React.Component {
  static propTypes = {
    containerStyle: PropTypes.object,
    photoPickerTitle: PropTypes.string,
    maxHeight: PropTypes.number,
    maxWidth: PropTypes.number,
    format: PropTypes.string,
    quality: PropTypes.number,
    onPhotoSelect: PropTypes.func, // returns the base64 string of uploaded photo
    onError: PropTypes.func, // if any error occur with response
    onTapCustomButton: PropTypes.func, // on tap custom button
    onStart: PropTypes.func, // when user starts (useful for loading, etc)
    onCancel: PropTypes.func, // when user cancel
    onResponse: PropTypes.func, // on response exists!
    onRender: PropTypes.func, // after render
    onResizedImageUri: PropTypes.func, // when image resized is ready
    imagePickerProps: PropTypes.object // react-native-image-picker props
  }

  state = {
    maxHeight: this.props.height || 600,
    maxWidth: this.props.width || 600,
    format: this.props.format || 'JPEG',
    quality: this.props.quality || 100,
    buttonDisabled: false
  }

  options = {
    title: this.props.photoPickerTitle || 'Select Photo',
    storageOptions: {
      skipBackup: true,
      path: 'images'
    },
    ...this.props.imagePickerProps
  }

  openImagePicker = () => {
    this.setState({buttonDisabled: true})
    if (this.props.onStart) this.props.onStart()

    // get image from image picker
    ImagePicker.showImagePicker(this.options, async response => {
      this.setState({buttonDisabled: false})

      let rotation = 0 
      const {originalRotation} = response
      

      if (this.props.onResponse) this.props.onResponse(response)

      if (response.didCancel) {
        console.log('User cancelled image picker')
        if (this.props.onCancel) this.props.onCancel('User cancelled image picker')
        return
      } else if (response.error) {
        console.log('ImagePicker Error: ', response.error)
        if (this.props.onError) this.props.onError(response.error)
        return
      } else if (response.customButton) {
        console.log('User tapped custom button: ', response.customButton)
        if (this.props.onTapCustomButton) this.props.onTapCustomButton(response.customButton)
        return
      }

      let { maxHeight, maxWidth, quality, format } = this.state
      
      //Determining rotation param
      if ( originalRotation === 90) { 
        rotation = 90 
      } else if (originalRotation === 180) { 
        //For a few images rotation is 180. 
        rotation = -180 
      } else if ( originalRotation === 270 )  {
        //When taking images with the front camera (selfie), the rotation is 270.
        rotation = -90 
      }
      // resize image
      const resizedImageUri = await ImageResizer.createResizedImage(
        `data:image/jpeg;base64,${response.data}`,
        maxHeight,
        maxWidth,
        format,
        quality,
        rotation
      )

      if (this.props.onResizedImageUri) this.props.onResizedImageUri(resizedImageUri)

      const filePath = Platform.OS === 'android' && resizedImageUri.uri.replace
        ? resizedImageUri.uri.replace('file:/data', '/data')
        : resizedImageUri.uri

      // convert image back to base64 string
      const photoData = await RNFS.readFile(filePath, 'base64')
      let source = { uri: resizedImageUri.uri }
      this.setState({
        avatarSource: source
      })

      // handle photo in props functions as data string
      if (this.props.onPhotoSelect) this.props.onPhotoSelect(photoData)
    })
  }

  renderChildren = props => {
    return React.Children.map(props.children, child => {
      if (child && child.type === Image && this.state.avatarSource) {
        return React.cloneElement(child, {
          source: this.state.avatarSource
        })
      } else return child
    })
  }

  componentDidUpdate() {
    if (this.props.onAfterRender) this.props.onAfterRender(this.state)
  }

  render() {
    return (
      <View style={[styles.container, this.props.containerStyle]}>
        <TouchableOpacity
          onPress={this.openImagePicker}
          disabled={this.state.buttonDisabled}
        >
          {this.renderChildren(this.props)}
        </TouchableOpacity>
      </View>
    )
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center'
  }
})