gistfile1.jsx

'use strict';
import React, { PureComponent, useState, useEffect } from 'react';
import { AppRegistry, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
import { RNCamera } from 'react-native-camera';
import Permissions from 'react-native-permissions';

const CameraApp = () => {
  let [flash, setFlash] = useState('off')
  let [zoom, setZoom] = useState(0)
  let [autoFocus, setAutoFocus] = useState('on')
  let [depth, setDepth] = useState(0)
  let [type, setType] = useState('back')
  let [permission, setPermission] = useState('undetermined')

  useEffect(() => {
     Permissions.check('photo').then(response => {
      // Response is one of: 'authorized', 'denied', 'restricted', or 'undetermined'
      setPermission(response);
    });
  }, []);
  
  toggleFlash() {
    setFlash(flashModeOrder[flash])
  }
   zoomOut() {
      setZoom(zoom - 0.1 < 0 ? 0 : zoom - 0.1)
  }
  zoomIn() {    
      setZoom(zoom + 0.1 > 1 ? 1 : zoom + 0.1);
  }
  takePicture = async() => {
    if (this.camera) {
      const options = { quality: 0.5, base64: true };
      const data = await this.camera.takePicture(options);
      console.log(data.uri);
    }
  };
  render() {
    return (
      <View style={styles.container}>
        <RNCamera
          ref={ref => {
            this.camera = ref;
          }}
          style={styles.preview}
          type={type}
          flashMode={flash}
        />
        <View style={{ flex: 0, flexDirection: 'row', justifyContent: 'center' }}>
          <TouchableOpacity onPress={this.takePicture.bind(this)} style={styles.capture}>
            <Text style={{ fontSize: 14 }}> SNAP </Text>
          </TouchableOpacity>
        </View>
      </View>
    );
}
}