How clear textinput when I submit data?

Hi, I’m making a form and I need to clear my textInputs (I have 9) when I submit data, I use a ref in textInput and this.textInputClear() in the submit button (touchableOpacity), but there is an error when I do it, undefined is not an object (evaluating ‘this.textCedula.clear’)

My form:

import React from 'react';

import {
  View,
  StyleSheet,
  TextInput,
  ScrollView,
  Text,
  TouchableOpacity,
  TouchableHighlight,
} from 'react-native';

import Modal from 'react-native-modal';
import { useState } from 'react';
import Icon from 'react-native-vector-icons/FontAwesome';
import { Dropdown } from 'react-native-material-dropdown';

export default class RegistroScreen extends React.Component {

  constructor(props)
  {
    super(props);
    this.state=({nombre:'',apellidos:'',alias:'',nro_cedula:'',correo:'',passwd:'',passwd2:'',celular:''});
    //this.state=({nacionalidad:[]})
  }

  componentWillMount(){
    this.getdata();
  }

  getdata(){
    var temp = [];
    fetch("localhost:8080/", {
      method: "Get",
      headers: {
          Accept: "application/json",
          "Content-Type": "aplication/json"
      }  
    })
  }

  InsertRecord=()=>
  {
    var nombre=this.state.nombre;
    var apellidos=this.state.apellidos;
    var alias=this.state.alias;
    var nro_cedula=this.state.nro_cedula;
    var correo=this.state.correo;
    var passwd=this.state.passwd;
    var passwd2=this.state.passwd2;
    var celular=this.state.celular;

    if(nombre.length==0 || apellidos.length==0 || nro_cedula.length==0 || correo.length==0 || passwd.length==0 || passwd2.length==0 || celular.length==0)
    {
      alert("Le faltan campos por llenar");
    }else{
      var InsertAPIURL="http://10.0.2.2:80/api/insert.php";
      var headers={
        'Accept':'application/json',
        'Content-Type':'application/json',
      };
      var Data={
        nombre: nombre,
        apellidos: apellidos,
        alias: alias,
        nro_cedula: nro_cedula,
        correo: correo,
        passwd: passwd,
        passwd2: passwd2,
        celular: celular,
      };
      fetch(InsertAPIURL,
          {
            method:'POST',
            headers:headers,
            body: JSON.stringify(Data),
          }
      ).then((response)=>response.json())
        .then((response)=>
        {
          alert("Registro realizado con éxito");
          {/* SCREEN LOGIN */}
          this.props.navigation.navigate('Login');
          // value('cedula') = '';
        })
        .catch((error)=>
        {
          alert("Error"+error);
        }      
      )
    }
  }
  render() {

    return (
      <ScrollView style={styles.container}>
            <View style={{flex: 1, flexDirection: 'column'}}>
               <View style={styles.inputGroup}>
              <Icon style={styles.searchIcon} name="address-card-o" size={19} 
                 color="#5292de"/>
                <TextInput
                  id="cedula"
                  ref={cedula => { this.textCedula = cedula }}
                  // style={styles.input}
                  underlineColorAndroid="transparent"
                  placeholder="N° Cédula (RUN/RUT)"
                  placeholderTextColor="#778DF2"
                  autoCapitalize="none"
                  onChangeText={nro_cedula=>this.setState({nro_cedula})}
                  // onChangeText={this.handleEmail}
                />
              </View>
            <View style={{flex: 4, flexDirection: 'column'}}>
            
                <View style={{flex: 0.5}}>
                  <TouchableOpacity
                  style={styles.submitButton}
                  onPress={this.InsertRecord,this.textCedula.clear()}
                  >
                    <Text style={styles.submitButtonText}> Enviar </Text>
                  </TouchableOpacity>
                </View>
            </View>
      </ScrollView>
    );
  }

Please, help me :frowning:
(I don’t know why nobody answer my questions, if is for my english, I’m sorry, I only know basic english)

The problem is not your English. The problem is that you’re asking a lot of questions that basically seem like you want us to teach you MySQL, PHP, JavaScript, React and React Native, and you’re basically not asking anything about Expo. These forums are about Expo. We’re not here to teach you JavaScript, let alone PHP or MySQL.

While we might sometimes be able to spend some time helping you with stuff that does not really have anything to do with Expo, it would be better for you to find other resources for those things.