registerScreen.js

import React, { Component } from "react";
import {
  StyleSheet,
  TextInput,
  ScrollView,
  TouchableOpacity,
  Image
} from "react-native";
import {
  View,
  Form,
  Label,
  Icon,
  Text,
  Container,
  Content,
  Button
} from "native-base";
import { connect } from "react-redux";
import Modal from "react-native-modal";
import globalStyles, { colors, height, width } from "../customLib/globalStyle";
import { registerUser } from "../Redux/actions/auth";

class RegisterScreen extends Component {
  registerAction = () => {
    this.props.updatePage(0);
  };

  render() {
    return (
      <Container>
            ...

              <TouchableOpacity
                onPress={() => this.registerAction()}
              >
                <Text
                  style={[
                    globalStyles.font,
                    { color: "white", fontSize: 18, fontWeight: "bold" }
                  ]}
                >
                  Daftar Sekarang
                </Text>
              </TouchableOpacity>

            ...
      </Container>
    );
  }
}

const mapStateToProps = ({ auth }) => ({
  isLoading: auth.isLoading
});

const mapDispatchToProps = dispatch => ({
  registerUser: param => dispatch(registerUser(param))
});

export default connect(
  mapStateToProps,
  mapDispatchToProps
)(RegisterScreen);