async getCameraRoll() {
    let allPhotos = [];
    let has_next_page = true;
    let end_cursor = undefined;
    let photos;

do {
  photos = await CameraRoll.getPhotos({
    first: 20,
    after: end_cursor === undefined ? null : end_cursor
  });
  if (photos.page_info.has_next_page !== true) has_next_page = false;
  end_cursor = photos.page_info.end_cursor;
  allPhotos = allPhotos.concat(photos.edges);
} while (has_next_page === true);
this.setState({ photos: allPhotos });
 }

<ScrollView contentContainerStyle={styles.scrollContainer}>
        {this.state.photos.map((image, i) => {
          let uri = image.node.image.uri;
          return (
            <TouchableOpacity
              activeOpacity={1}
              style={styles.imageWrapper}
              key={i}
              onPress={() =>
                this.props.navigator.push({
                  screen: "watiz.ImageSelection",
                  navigatorStyle: {
                    navBarHidden: true
                  },
                  passProps: { uri, previousScreen: "watiz.Gallery" }
                })
              }
              underlayColor="transparent"
            >
              <Image style={styles.image} source={{ uri: uri }} />
            </TouchableOpacity>
          );
        })}
      </ScrollView>