work with props and states react native

good morning I'm new to react native and I have 2 windows and then one is the login and the other shows a list of objects then I want to know how I do to take the name with which I made the session to the other window and display it in a < Text >

LOGIN WINDOW --- / pages / loginView

import React from 'react';
import {StyleSheet,Text,Dimensions,View,TouchableOpacity,TextInput,Keyboard,Image,Alert} from 'react-native';
import Icon from 'react-native-vector-icons/FontAwesome';

const {width, height} = Dimensions.get('window');

export default class loginView extends React.Component {
  static navigationOptions= ({navigation}) =>({title: 'Login'});  

  constructor(props){
    super(props)
    this.state={userName:'', userPassword:'', }
  }

  login=()=>{
    const {userName,userPassword} = this.state;

    if(userName=="" || userPassword==""){this.setState({mensaje:'debe llenar los campos'})}
    else{
      fetch('http://www.yarascorp.com/reactnative/login.php',{
        method:'post',
        header:{'Accept':'application/json', 'Content-type':'application/json'},
        body:JSON.stringify({name:userName, password:userPassword })
      })
      .then((response)=>response.json())
      .then((responseJson)=>{
        if(responseJson == "Correcto"){
          this.setState({mensaje:'Inicio correcto'})
          this.props.navigation.navigate("Profile");
        }else{
          this.setState({mensaje:'Error con el usuario o clave'})
        }
      })
      .catch((error)=>{console.error(error);});
    }
    Keyboard.dismiss();
  }

  render() {
    return ( 
      <View style={styles.container}>    
        <View style={styles.contlogo}>
                    <View style={styles.hlogo}><Image style={styles.coverImage1} source={require('../imgs/costco.png')}/></View>
                    <View style={styles.hlogo}><Image style={styles.coverImage2} source={require('../imgs/logometalss.png')}/></View>
                </View>
        <View style={styles.cuerpo}>
          <View style={styles.campos}>
            <Icon style={styles.infoIcon} name="user" size={20} color="grey"/>
            <TextInput 
              placeholder="Ingrese Usuario" style={styles.textInput} underlineColorAndroid="transparent" 
              onChangeText={userName => this.setState({userName})} value={this.state.userName}
            />
          </View>
          <View style={styles.campos}>
            <Icon style={styles.infoIcon} name="key" size={20} color="grey"/>
            <TextInput 
              secureTextEntry={true} placeholder="Ingrese Clave" style={styles.textInput} 
              underlineColorAndroid="transparent" onChangeText={userPassword => this.setState({userPassword})} value={this.state.text1}/>
          </View>
          <TouchableOpacity onPress={this.login}style={{width:250,padding:10,marginTop:20,backgroundColor:"#A30000",alignItems:'center'}}>
            <Text style={{color:'white',fontWeight:'bold'}}>Entrar</Text>
          </TouchableOpacity>
          <Text style={styles.mensaje}>{this.state.mensaje}</Text>
        </View>
      </View>
    );
  }
}

VISUALIZATION WINDOW --- / pages / visorView

import React from 'react';
import {StyleSheet,Text,View,Button,Alert,ActivityIndicator,ListView,Platform,TouchableOpacity} from 'react-native';
import loginView from '../pages/loginView';


export default class visorView extends React.Component{
  static navigationOptions=({navigation}) =>({header: null,}); 
  static navigationOptions={tabBarLabel:'Visor'}


  constructor(props){
    super(props);
    this.state={
      isLoading: true,
    }
  }

  GetItem (cliente,deservicios){
    Alert.alert(cliente, deservicios);
  }

  componentDidMount(){
    return fetch('http://www.yarascorp.com/reactnative/ordenesprcostco.php')
    .then((response)=>response.json())
    .then((responseJson)=>{
      let ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
      this.setState({
        isLoading: false,
        dataSource: ds.cloneWithRows(responseJson),
      },function(){
        // In this block you can do something with new state.
      });
    })
    .catch((error)=>{
      console.error(error);
    });
  }

  ListViewItemSeparator=()=>{
    return(
      <View
        style={{
          height:.5,
          width:"100%",
          backgroundColor:"#000",
        }}
      />
    );
  }

  render(){
    if(this.state.isLoading){
      return(
        <View style={{flex: 1, paddingTop: 20}}>
          <ActivityIndicator />
        </View>
      );
    }
    return(
      <View style={styles.container}>
        <View style={styles.cabecera}>
          <Text style={styles.titulo}>- Visor de pedidos -</Text> 
        </View>
        <View style={styles.MainContainer}>
          <ListView
            dataSource={this.state.dataSource}
            renderSeparator={this.ListViewItemSeparator}
            renderRow={(rowData) =>
              <View style={{flex:1, flexDirection: 'column'}} >
                <TouchableOpacity onPress={this.GetItem.bind(this,rowData.cliente,rowData.descripcion)} >
                <Text style={styles.textViewContainer} autoCapitalize="characters">{rowData.cliente+' / '+rowData.direccion}</Text>
                </TouchableOpacity>
              </View>
            }
          />
        </View>
      </View>
    );
  }
}