title: How to use multiple TextInput for validation without using any outside 3rd party packages in React Native
body: <p>I am having a login and signup form in my app for which I need to do input fields validation. 
  I am beginner to React-Native app development.</p>
  
  <p>I have tried some packages:
  <strong>reference:</strong> </p>
  
  <ol>
  <li><a href="https://github.com/NewOldMax/react-native-validator-form" rel="nofollow noreferrer">https://github.com/NewOldMax/react-native-validator-form</a></li>
  <li><a href="https://github.com/n4kz/react-native-material-textfield" rel="nofollow noreferrer">https://github.com/n4kz/react-native-material-textfield</a></li>
  </ol>
  
  <p>essential package versions I am using for my app:</p>
  
  <pre><code>"react": "16.9.0",
  "react-native": "0.61.5",
  </code></pre>
  
  <p>but I am having little difficulties in working with them. So I need to handle validations from my app side in react-native only. Any help would be really appreciated.</p>