Formik

安裝Formik

npm install formik --save

使用Formik

• 不需要用useState,Formik會自動幫我們存資料

import React from 'react';
import {TextInput, Button} from 'react-native';
import {Formik} from 'formik';

const MyScreen = () => {
  return (
    <View>
      <Formik 
        initialValues={{email:'', password:''}}
    	onSubmit={(values) => console.log(values)}
      >
      {({handleChange, handleSubmit}) => (
        <>
    	<TextInput onChangeText={handleChange('email')}>
    	<TextInput onChangeText={handleChange('password')}>
    	<Button onPress={handleSubmit}>
    	</>
      )}
	  
      </Formik>
    </View>
  );
}

export default MyScreen;