如何在React Native App中打开摄像头？

npm install react-native-camera --save

import { Camera } from 'react-native-camera';

render() {
  return (
    <Camera
      style={{ flex: 1 }}
      type={Camera.constants.Type.back}
      ref={(cam) => {
        this.camera = cam;
      }}
    />
  );
}

takePicture() {
  const options = {};
  this.camera.capture({ metadata: options })
    .then((data) => console.log(data))
    .catch((error) => console.log(error));
}

render() {
  return (
    <View>
      <Camera
        style={{ flex: 1 }}
        type={Camera.constants.Type.back}
        ref={(cam) => {
          this.camera = cam;
        }}
      />
      <TouchableOpacity onPress={this.takePicture.bind(this)}>
        <Text>拍照</Text>
      </TouchableOpacity>
    </View>
  );
}