Select image method

App.js

/**
 * Select image method
 */
pickImage = () => {
  ImagePicker.showImagePicker(options, response => {
    if (response.didCancel) {
      console.log('You cancelled image picker 😟');
    } else if (response.error) {
      alert('And error occured: ', response.error);
    } else {
      const source = { uri: response.uri };
      this.setState({
        imgSource: source,
        imageUri: response.uri
      });
    }
  });
};