title: Default underline not visible in TextInput in React native
body: <p>I am new to React native development. In my application I have login page, in this login page two textinput. In this textinput not getting underline. I have tried many ways but not getting underline. Here my requirement is need underline of inputtext. So how to get this underline?</p>
  
  <p>This is the my login form code.</p>
  
  <pre><code>import React, {Component} from 'react';
  import {StyleSheet, Text, View,TextInput,TouchableOpacity} from 'react-native';
  
  export default class App extends Component {
    render() {
      return (
        &lt;View style={styles.container}&gt;
          &lt;Text style={styles.welcome}&gt;SEDC&lt;/Text&gt;
        &lt;TextInput placeholder="Acct No/User Id" style={styles.textInput} multiline={true}&gt;&lt;/TextInput&gt;
        &lt;TextInput placeholder="Password" style={styles.textInput}&gt;&lt;/TextInput&gt;
        &lt;TouchableOpacity style={styles.btn} onPress={this.login}&gt;&lt;Text&gt;Log In&lt;/Text&gt;&lt;/TouchableOpacity&gt;
        &lt;/View&gt;
      );
    }
  
    login=()=&gt;{
      alert("testing......");
      // this.props.navigation.navigate('Second');
  }
  }
  
  const styles = StyleSheet.create({
    container: {
      flex: 1,
      justifyContent: 'center',
      alignItems: 'center',
      backgroundColor: '#F5FCFF',
    },
    welcome: {
      fontSize: 20,
      textAlign: 'center',
      margin: 10,
    },
  
    textInput: {
      alignSelf: 'stretch',
      padding: 10,
      marginLeft: 50,
      borderBottomColor:'#000',
      margin:5,
      marginRight:50,
      // backgroundColor: '#000',
  },
    btn:{
      alignSelf: 'stretch',
      backgroundColor: '#01c853',
      padding: 10,
      margin:10,
      marginLeft: 100,
      marginRight:100,
      alignItems: 'center',
  }
  });
  </code></pre>
  
  <p>This is the output of my code.</p>
  
  <p><a href="https://i.stack.imgur.com/xj0uF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/xj0uF.png" alt="enter image description here"></a></p>
  
  <p>I have tried with borderBottomColor:'#000', but not working..So please guide me how to do this</p>
  
  <p>Thanks In Advance...</p>