Tag: Tutorial Guide

React Native – How To Use Redux With React Hooks In React Native Application ?

Hello Readers, CoolMonkTechie heartily welcomes you in this article.

In this article, we will learn how to use Redux with React Hooks by building a real React Native Application. Redux is a popular React and React Native state management library, meant to be used in complex React and React Native apps where sharing state between multi-level components can get extremely difficult to manage. React Hooks provide us  the ability to use functional components in React or React Native apps. Their ability to provide support to manage a component’s state and handle side-effects offers an alternative to class components.

In this article, let us look at some hooks provided by the react-redux library that provides a way to avoid writing boilerplate code when using the connect() High Order Component.

To understand the use of Redux with React Hooks in React Native application, We will cover the below steps as below :

  1. Configure a New React Native Application
  2. Create Mock Screens
  3. Set Up a Stack Navigator
  4. Create an Overlay Modal With Transparent Background
  5. Navigate to the Modal Screen
  6. Add a Custom Modal With a Transparent Background
  7. Adding a Text Input in the Custom Modal Screen
  8. Add a Custom Header to the List Screen
  9. Change the StatusBar Appearance
  10. Add a List view
  11. Creating a Root Reducer
  12. Configuring a Store
  13. Implement the useSelector Hook
  14. Adding Items to the List by Dispatching an Action Creator
  15. Adding FlatList to Display the Items in the List
  16. Updating the Header
  17. Removing an Item
  18. The final code of the demo application
  19. The final output of the demo application

A famous quote about learning is :

” The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as we continue to live. “

So Let’s begin.


Step 1 – Configure a New React Native Application

To configure a new React Native app, we are going to use expo-cli with a blank template to generate a new app. 

expo init projectname

Firstly, we have generated the project, Then we navigate inside the directory and install the following dependencies.

yarn add redux react-redux @react-navigation/native @react-navigation/stack

We are going to use Stack Navigator from the react-navigation library for two different screens in this demo app. For expo-cli, we run the following command to install required dependencies for the navigator to work.

expo install react-native-gesture-handler react-native-reanimated react-native-screens react-native-safe-area-context @react-native-community/masked-view


Step 2 – Create Mock Screens

In this section, let us create two screens that the app is going to use to display a list of items and allow the user to add to each item. We create a new directory called src/screens and then create two new ListScreen.js and ModalScreen.js files.

Each of these screen files is going to have some random data to display until the stack navigator is set up.

Here is the code snippet for ListScreen.js :

import React from "react";import { StyleSheet, Text, View } from "react-native";function ListScreen() {return (<View style={styles.container}><Text>List Screen</Text></View>);}const styles = StyleSheet.create({container: {flex: 1,backgroundColor: "#fff",alignItems: "center",justifyContent: "center",},});export default ListScreen;

Here is the code snippet for ModalScreen.js :

import React from "react";import { StyleSheet, Text, View } from "react-native";function ModalScreen() {return (<View style={styles.container}><Text>Modal Screen</Text></View>);}const styles = StyleSheet.create({container: {flex: 1,backgroundColor: "#fff",alignItems: "center",justifyContent: "center",},});export default ModalScreen;


Step 3 – Set Up a Stack Navigator

A Stack Navigator allows the app to transit between different or multiple screens and manages the navigation history. We create a new file called AppNavigator.js inside the src/navigation directory. This file is going to contain all the configurations required to set up a Stack Navigator.

With the recent release of react-navigation version 5, the way to configure a stack navigator has changed. The major highlight of these new changes is the component-based configuration. Navigation patterns are now more component-based, common use cases can now be handled with pre-defined Hooks, the new architecture allowing us to configure and update a screen from within the component itself. 

import * as React from "react";import { NavigationContainer } from "@react-navigation/native";import { createStackNavigator } from "@react-navigation/stack";import ListScreen from "../screens/ListScreen";import ModalScreen from "../screens/ModalScreen";

The NavigationContainer is a component provided by the react-navigation library that manages the navigation tree. It contains the navigation state and wraps all the navigator’s structure.

The createStackNavigator is a function that implements a stack navigation pattern. This function returns two React components: Screen and Navigator, that are going to allow us to configure each component screen.

const Stack = createStackNavigator();function MainStackNavigator() {return (<NavigationContainer><Stack.Navigator><Stack.Screen name="List" component={ListScreen} /><Stack.Screen name="Modal" component={ModalScreen} /></Stack.Navigator></NavigationContainer>);}export default MainStackNavigator;

Open the App.js file and import the MainStackNavigator in the root of the app as shown below:

import React from "react";import MainStackNavigator from "./src/navigation/AppNavigator";export default function App() {return <MainStackNavigator />;}

Now, we go the terminal window and execute the command expo start. In the simulator or the real device we are running the Expo client, we are going to notice similar results as shown below:

The first screen in the Stack Navigator is ListScreen, which is shown as above.


Step 4 – Create an Overlay Modal With Transparent Background

The modal can be easily configured with a stack navigator with an overlay of transparent background on the screen as they display it. Since the ListScreen is going to be the first screen and display a list of items, the ModalScreen is going to be a dialog. This dialog appears by clicking a button from the ListScreen in the current application and adds a transparent layer on the screen behind it when opened. The previous screen will be visible underneath this dialog.

This can be done by configuring screenOptions on a Stack Navigator. The react-navigation library provides a way to enable the overlay with a property called cardOverlayEnabled.

Modify AppNavigator.js file as following :

function MainStackNavigator() {return (<NavigationContainer><Stack.Navigatormode="modal"headerMode="none"screenOptions={{cardStyle: { backgroundColor: "transparent" },cardOverlayEnabled: true,cardStyleInterpolator: ({ current: { progress } }) => ({cardStyle: {opacity: progress.interpolate({inputRange: [0, 0.5, 0.9, 1],outputRange: [0, 0.25, 0.7, 1],}),},overlayStyle: {opacity: progress.interpolate({inputRange: [0, 1],outputRange: [0, 0.5],extrapolate: "clamp",}),},}),}}><Stack.Screen name="List" component={ListScreen} /><Stack.Screen name="Modal" component={ModalScreen} /></Stack.Navigator></NavigationContainer>);}

We have to configure the styles of both the screens and add a way for the modal dialog to open from the ListScreen.


Step 5 – Navigate to the Modal Screen

To navigate to the modal screen, let’s add a floating action button with an icon to the ListScreen.js screen component.

This button is going to be touchable and on a single touch is going to navigate to the ModalScreen. The navigation is going to be handled by the navigation prop that can be passed as an argument to the functional component ListScreen. This is only possible because the ListScreen is part of the Stack navigator.

Any screen in a React Native app that utilizes a react-navigation library is a route or a part of a navigation pattern that has access to navigation prop.

Modify the ListScreen.js file as below:

import React from "react";import {StyleSheet,StatusBar,Text,View,TouchableOpacity,} from "react-native";import { Ionicons } from "@expo/vector-icons";function ListScreen({ navigation }) {return (<View style={styles.container}><View style={styles.fabContainer}><TouchableOpacityonPress={() => navigation.navigate("Modal")}style={styles.fabButton}><Ionicons name="ios-add" color="#fff" size={70} /></TouchableOpacity></View></View>);}const styles = StyleSheet.create({container: {flex: 1,backgroundColor: "blue",},fabContainer: {justifyContent: "flex-end",flexDirection: "row",position: "absolute",right: 10,bottom: 20,},fabButton: {backgroundColor: "blue",borderRadius: 35,width: 70,height: 70,alignItems: "center",justifyContent: "center",},});export default ListScreen;

We go back to the simulator device, and we are going to notice the changes. The first thing to notice is the action button floating at the bottom right corner.

On pressing this button, a full-screen modal will open.


Step 6 – Add a Custom Modal With a Transparent Background

In this section, let’s change the behavior of how the modal appears on the ListScreen right now and how we want it to be. As an overlay, we also want it to take the only 1/3rd of the current screen.

This modal is going to have an input field in the future to let the user add items to the list. However, for now, it is going to display a text and a close button.

The close button is going to dismiss the modal when the user wants to go back to the List screen without taking any other action. The close button is going to be placed using position: absolute property and is going to use navigation.goBack() pre-defined method to go back to the List screen.

Here is the complete code for the modal screen at this point. Open ModalScreen.js and modify it.

import React from "react";import { StyleSheet, TouchableOpacity, Text, View } from "react-native";import { Ionicons } from "@expo/vector-icons";function ModalScreen({ navigation }) {return (<View style={styles.container}><View style={styles.innerContainer}><View style={styles.closeButtonContainer}><TouchableOpacitystyle={styles.closeButton}onPress={() => navigation.goBack()}><Ionicons name="ios-close" color="#101010" size={40} /></TouchableOpacity></View><View style={styles.modalContainer}><Text style={{ color: "#444", fontSize: 20 }}>What do you want to do?</Text></View></View></View>);}const styles = StyleSheet.create({container: {flex: 1,},innerContainer: {borderTopLeftRadius: 10,borderTopRightRadius: 10,justifyContent: "flex-end",flexDirection: "row",height: "30%",width: "100%",position: "absolute",bottom: 0,right: 0,backgroundColor: "#fff",},closeButtonContainer: {position: "absolute",alignItems: "flex-end",right: 10,},closeButton: {backgroundColor: "#d3d3d3",borderRadius: 20,width: 40,height: 40,top: 10,alignItems: "center",justifyContent: "center",},modalContainer: {justifyContent: "center",alignItems: "center",position: "absolute",margin: 60,top: 10,left: 50,},});export default ModalScreen;

Here is the output you are going to get in the device after this step:


Step 7 – Adding a Text Input in the Custom Modal Screen

In this section, let’s add a text input component from the react-native core. This is going to allow the user to enter the name of the item they want to add to the list. For now, since we haven’t configured the Redux to manage the app state, let us use the hook useState to manage the component state locally.

Open ModalScreen.js and import TextInput from react-native core.

import {StyleSheet,TouchableOpacity,Text,View,TextInput,} from "react-native";

Next, inside the View that has the style of modalContainer add the following TextInput component as well as a touchable submit button. This touchable button is going to navigate back to the list screen when the user has entered a value in the input field.

<View style={styles.modalContainer}><Text style={{ color: "#444", fontSize: 20 }}>What do you want to do?</Text><TextInputstyle={{height: 50,width: 200,padding: 5,borderColor: "gray",borderBottomWidth: 1,}}numberOfLines={1}onChangeText={(value) => setValue(value)}value={value}clearButtonMode="while-editing"/><TouchableOpacitystyle={{marginTop: 10,backgroundColor: "blue",width: 50,height: 50,\alignItems: "center",justifyContent: "center",borderRadius: 5,}}onPress={() => navigation.navigate("List")}><Ionicons name="ios-arrow-dropright-circle" size={40} color="#fff" /></TouchableOpacity></View>;


Step 8 – Add a Custom Header to the List Screen

Create a new file called Header.js inside the directory src/components. This functional component is going to display the header title in the List screen.

Add the following code snippet to the file. We have just created:

import React from "react";import { View, Text, StyleSheet } from "react-native";function Header(props) {const { title } = props;return (<View style={styles.container}><Text style={styles.text}>{title}</Text></View>);}const styles = StyleSheet.create({container: {alignItems: "center",justifyContent: "center",backgroundColor: "blue",height: 125,paddingTop: 20,},text: {color: "#fff",fontSize: 28,fontWeight: "500",},});export default Header;

Next, we go to the ListScreen.js and import this functional component below the other statements.

// after other import statementsimport Header from '../components/Header'

Then add the component to render before the floating button.

function ListScreen({ navigation }) {return (<View style={styles.container}><Header title={"List"} />{/* rest of the code remains same */}</View>);}


Step 9 – Change the StatusBar Appearance

To change the StatusBar appearance, let us import it from the react-native core API.

import {StyleSheet,StatusBar,Text,View,TouchableOpacity,} from "react-native";

Next, using React Fragment short hand with angle brackets, modify the return statement of ListScreen component as below:

function ListScreen({ navigation }) {return (<><StatusBar barStyle="light-content" /><View style={styles.container}><Header title={"List"} /><View style={styles.fabContainer}><TouchableOpacityonPress={() => navigation.navigate("Modal")}style={styles.fabButton}><Ionicons name="ios-add" color="#fff" size={70} /></TouchableOpacity></View></View></>);}

We will now notice that the Status bar has a white appearance.


Step 10 – Add a List view

In this section, let’s implement the main view that is going to display a list of items. In ListScreen.js, add the following functional component called ListView.

function ListView() {return (<Viewstyle={{backgroundColor: "white",flex: 1,borderTopLeftRadius: 20,borderTopRightRadius: 20,paddingHorizontal: 20,paddingVertical: 20,}}><Text>Here goes list items</Text></View>);}

Then, modify the ListScreen to display it below the Header.

<View style={styles.container}><Header title={"List"} /><ListView />{/* rest of the code remains same */}</View>;

Go to the device, we are running the app, and we are going to notice a major difference in its appearance.


Step 11 – Creating a Root Reducer

In this section, we create a new directory called src/redux/ and inside it, a new file called reducer.js. This file is going to have the definition of action types, action creators and the only reducer we are going to create in this app. This reducer is going to be called rootReducer.

Redux is used to manage the state of the whole application. Therefore, it represents this state by one JavaScript object. Think of this object as read-only (immutable), since we cannot change this state or the object because they represent it in the form of a tree. It requires an action to do so.

Actions are similar to events in Redux. And, they can be triggered in the button press, timers or network requests.

Start by defining an action type as below.

export const ADD_ITEM = 'ADD_ITEM'

Then we define the action creator called addItem that is going to take an item from the user’s input and add it to the list. This is the action creator function that we are going to trigger later.

export const addItem = (item) => ({type: ADD_ITEM,payload: item,});

Define an initial state which is going to have an empty array called itemList. Whenever an action is triggered, the state of the application changes. The handling of the application’s state is done by the reducers.

This initial state is going to be passed as a parameter to the rootReducer. Calling the create action is going to invoke the logic defined for the same action type in the reducer.

Using a reducer, we either want to initiate the current app state or update it, without modifying the whole state on each action trigger. The spread operator returned in the action type ADD_ITEM indicates that.

To update the state, in our case, to add an item object to the itemList array, let us use the contact() that is going to return a new array whenever an item is added to the list. This also satisfies the redux philosophy of not mutating the state directly.

const initialState = {itemList: [],};const rootReducer = (state = initialState, action) => {switch (action.type) {case ADD_ITEM:return {...state,itemList: state.itemList.concat({id: Math.random(),name: action.payload,}),};default:return state;}};export default rootReducer;


Step 12 – Configuring a Store

In this section, we create a new file src/redux/store.js. A store is an object that brings the actions and reducers together. This file is going to implement that.

The store provides and holds the state at the application level instead of individual components. Add the following code snippet to it:

import { createStore } from "redux";import rootReducer from "./reducer";const store = createStore(rootReducer);export default store;

Now, we connect this store to the app, we open App.js file and import the store from this file as well as the High Order Component Provider from react-redux npm package. This HOC helps us to pass the store down to the rest of the components of the current app.

import React from "react";import { Provider as StateProvider } from "react-redux";import store from "./src/redux/store";import MainStackNavigator from "./src/navigation/AppNavigator";export default function App() {return (<StateProvider store={store}><MainStackNavigator /></StateProvider>);}


Step 13 – Implement the useSelector Hook

To access state when managing it with Redux, the useSelector hook is provided in the library. It is similar to mapStateToProps argument that is passed inside the connect(). It allows us to extract data from the Redux store state using a selector function.

The major difference between the hook and the argument (the older way) is that the hook may return any value as a result, not just an object.

Inside ListScreen.js add the following import statement.

import { useSelector } from 'react-redux'

Then, we fetch the listItems array using the hook useSelector inside the ListView component. Also, modify its return statement by displaying a message if the list is empty or not.

function ListView() {const listItems = useSelector((state) => state.itemList);return (<Viewstyle={{backgroundColor: "white",flex: 1,borderTopLeftRadius: 20,borderTopRightRadius: 20,paddingHorizontal: 20,paddingVertical: 20,}}>{listItems.length !== 0 ? (<Text>Contains List items</Text>) : (<Text style={{ fontSize: 30 }}>You list is empty :'(</Text>)}</View>);}


Step 14 – Adding Items to the List by Dispatching an Action Creator

The useDispatch() hook completely refers to the dispatch function from the Redux store. This hook is used only when there is a need to dispatch an action. In the ModalScreen.js to add an item based on the value of TextInput, the state has to be updated. This can be done by triggering the action creator method called addItem defined when creating actions inside redux/reducer.js file.

Start by importing the following statements:

import { useDispatch } from 'react-redux'import { addItem } from '../redux/reducer'

Next, inside the ModalScreen component, we create a helper method called onSaveNote which when triggered on submission of the text input, is going to trigger the action creator as well as take the user back to the List screen.

function ModalScreen({ navigation }) {const [value, setValue] = useState("");const dispatch = useDispatch();const onSaveNote = (value) => {dispatch(addItem(value));navigation.navigate("List");};/* rest of the code remains same */}

Lastly, add this helper method as the value of onPress on the submission button.

<TouchableOpacitystyle={{marginTop: 10,backgroundColor: "blue",width: 50,height: 50,alignItems: "center",justifyContent: "center",borderRadius: 5,}}onPress={() => onSaveNote(value)}><Ionicons name="ios-arrow-dropright-circle" size={40} color="#fff" /></TouchableOpacity>;


Step 15 – Adding FlatList to Display the Items in the List

To display a list of items on List screen, we open the file ListScreen.js and import the FlatList from react-native.

import {StyleSheet,StatusBar,Text,View,TouchableOpacity,FlatList,} from "react-native";

Then, modify the ListView render function as below:

{listItems.length !== 0 ? (<FlatListdata={listItems}keyExtractor={(item) => item.id.toString()}renderItem={({ item }) => (<View style={styles.listItemContainer}><View style={styles.listItemMetaContainer}><Text style={styles.itemTitle} numberOfLines={1}>{item.name}</Text></View></View>)}/>) : (<Text style={{ fontSize: 30 }}>You list is empty :'(</Text>);}


Step 16 – Updating the Header

In this section, using the current app’s state, let us display the number of items in the list to be shown in the header as well. This can be done by using useSelector hook from react-redux.

Modify the file components/Header.js as the following:

import React from "react";import { View, Text, StyleSheet } from "react-native";import { useSelector } from "react-redux";function Header(props) {const { title } = props;const listItems = useSelector((state) => state.itemList);return (<View style={styles.container}><Text style={styles.title}>{title}</Text><Text style={styles.subTitle}>Left: {listItems.length}</Text></View>);}const styles = StyleSheet.create({container: {alignItems: "center",justifyContent: "center",backgroundColor: "blue",height: 125,paddingTop: 20,},title: {color: "#fff",fontSize: 28,fontWeight: "500",},subTitle: {paddingTop: 5,fontSize: 18,color: "#fff",},});export default Header;

Here is the updated header bar when there is one item on the list.


Step 17 – Removing an Item

Since we have gone through the process of understanding how redux hooks work with React Native apps, we try adding a remove item button that is going to delete an item from the list as shown below.

Here is the updated redux/reducer file that has action type REMOVE_ITEM.

export const ADD_ITEM = "ADD_ITEM";export const REMOVE_ITEM = "REMOVE_ITEM";export const addItem = (item) => ({type: ADD_ITEM,payload: item,});export const removeItem = (id) => ({type: REMOVE_ITEM,payload: id,});const initialState = {itemList: [],};const rootReducer = (state = initialState, action) => {switch (action.type) {case ADD_ITEM:return {...state,itemList: state.itemList.concat({id: Math.random(),name: action.payload,}),};case REMOVE_ITEM:return {...state,itemList: state.itemList.filter((item) => item.id !== action.payload),};default:return state;}};export default rootReducer;

Also, here is the updated ListScreen.js where we add the button to remove items with corresponding styles.

To trigger an action, we will have to make use of useDispatch() hook.


Step 18 – The final code of the demo application

Here is the final source code of the demo app:


1. src/redux/reducer.js

export const ADD_ITEM = "ADD_ITEM";export const REMOVE_ITEM = "REMOVE_ITEM";export const addItem = (item) => ({type: ADD_ITEM,payload: item,});export const removeItem = (id) => ({type: REMOVE_ITEM,payload: id,});const initialState = {itemList: [],};const rootReducer = (state = initialState, action) => {switch (action.type) {case ADD_ITEM:return {...state,itemList: state.itemList.concat({id: Math.random(),name: action.payload,}),};case REMOVE_ITEM:return {...state,itemList: state.itemList.filter((item) => item.id !== action.payload),};default:return state;}};export default rootReducer;


2. src/redux/store.js

import { createStore } from "redux";import rootReducer from "./reducer";const store = createStore(rootReducer);export default store;


3. src/components/Header.js

import React from "react";import { View, Text, StyleSheet } from "react-native";import { useSelector } from "react-redux";function Header(props) {const { title } = props;const listItems = useSelector((state) => state.itemList);return (<View style={styles.container}><Text style={styles.title}>{title}</Text><Text style={styles.subTitle}>Left: {listItems.length}</Text></View>);}const styles = StyleSheet.create({container: {alignItems: "center",justifyContent: "center",backgroundColor: "blue",height: 125,paddingTop: 20,},title: {color: "#fff",fontSize: 28,fontWeight: "500",},subTitle: {paddingTop: 5,fontSize: 18,color: "#fff",},});export default Header;


4. src/navigation/AppNavigator.js

import * as React from "react";import { NavigationContainer } from "@react-navigation/native";import { createStackNavigator } from "@react-navigation/stack";import ListScreen from "../screens/ListScreen";import ModalScreen from "../screens/ModalScreen";const Stack = createStackNavigator();function MainStackNavigator() {return (<NavigationContainer><Stack.Navigatormode="modal"headerMode="none"screenOptions={{cardStyle: { backgroundColor: "transparent" },cardOverlayEnabled: true,cardStyleInterpolator: ({ current: { progress } }) => ({cardStyle: {opacity: progress.interpolate({inputRange: [0, 0.5, 0.9, 1],outputRange: [0, 0.25, 0.7, 1],}),},overlayStyle: {opacity: progress.interpolate({inputRange: [0, 1],outputRange: [0, 0.5],extrapolate: "clamp",}),},}),}}><Stack.Screen name="List" component={ListScreen} /><Stack.Screen name="Modal" component={ModalScreen} /></Stack.Navigator></NavigationContainer>);}export default MainStackNavigator;


5. src/screens/ListScreen.js

import React from "react";import {StyleSheet,StatusBar,Text,View,TouchableOpacity,FlatList,} from "react-native";import { Ionicons } from "@expo/vector-icons";import { useSelector, useDispatch } from "react-redux";import { removeItem } from "../redux/reducer";import Header from "../components/Header";function ListScreen({ navigation }) {return (<><StatusBar barStyle="light-content" /><View style={styles.container}><Header title={"List"} /><ListView /><View style={styles.fabContainer}><TouchableOpacityonPress={() => navigation.navigate("Modal")}style={styles.fabButton}><Ionicons name="ios-add" color="#fff" size={70} /></TouchableOpacity></View></View></>);}function ListView() {const listItems = useSelector((state) => state.itemList);console.log({ listItems });const dispatch = useDispatch();return (<Viewstyle={{backgroundColor: "white",flex: 1,borderTopLeftRadius: 20,borderTopRightRadius: 20,paddingHorizontal: 20,paddingVertical: 20,}}>{listItems.length !== 0 ? (<FlatListdata={listItems}keyExtractor={(item) => item.id.toString()}renderItem={({ item }) => (<View style={styles.listItemContainer}><Text style={styles.itemTitle} numberOfLines={1}>{item.name}</Text><TouchableOpacityonPress={() => dispatch(removeItem(item.id))}style={styles.button}><Ionicons name="ios-trash" color="#fff" size={20} /></TouchableOpacity></View>)}/>) : (<Text style={{ fontSize: 30 }}>You list is empty :'(</Text>)}</View>);}const styles = StyleSheet.create({container: {flex: 1,backgroundColor: "blue",},fabContainer: {justifyContent: "flex-end",flexDirection: "row",position: "absolute",right: 10,bottom: 20,},fabButton: {backgroundColor: "blue",borderRadius: 35,width: 70,height: 70,alignItems: "center",justifyContent: "center",},listItemContainer: {flex: 1,flexDirection: "row",paddingTop: 10,paddingBottom: 5,paddingRight: 5,justifyContent: "space-between",width: "100%",borderBottomWidth: 0.25,},itemTitle: {fontSize: 22,fontWeight: "400",},button: {borderRadius: 8,backgroundColor: "#ff333390",padding: 5,},});export default ListScreen;


6. src/screens/ModalScreen.js

import React, { useState, useCallback } from "react";import {StyleSheet,Text,View,TouchableOpacity,TextInput,} from "react-native";import { Ionicons } from "@expo/vector-icons";import { useDispatch } from "react-redux";import { addItem } from "../redux/reducer";function ModalScreen({ navigation }) {const [value, setValue] = useState("");const dispatch = useDispatch();const onSaveNote = (value) => {dispatch(addItem(value));navigation.navigate("List");};return (<View style={styles.container}><View style={styles.innerContainer}><View style={styles.closeButtonContainer}><TouchableOpacitystyle={styles.closeButton}onPress={() => navigation.goBack()}><Ionicons name="ios-close" color="#101010" size={40} /></TouchableOpacity></View><View style={styles.modalContainer}><Text style={{ color: "#444", fontSize: 20 }}>What do you want to do?</Text><TextInputstyle={{height: 50,width: 200,padding: 5,borderColor: "gray",borderBottomWidth: 1,}}numberOfLines={1}onChangeText={(value) => setValue(value)}value={value}clearButtonMode="while-editing"/><TouchableOpacitystyle={{marginTop: 10,backgroundColor: "blue",width: 50,height: 50,alignItems: "center",justifyContent: "center",borderRadius: 5,}}onPress={() => onSaveNote(value)}><Ioniconsname="ios-arrow-dropright-circle"size={40}color="#fff"/></TouchableOpacity></View></View></View>);}const styles = StyleSheet.create({container: {flex: 1,},innerContainer: {borderTopLeftRadius: 10,borderTopRightRadius: 10,justifyContent: "flex-end",flexDirection: "row",height: "30%",width: "100%",position: "absolute",bottom: 0,right: 0,backgroundColor: "#fff",},closeButtonContainer: {position: "absolute",alignItems: "flex-end",right: 10,},closeButton: {backgroundColor: "#d3d3d3",borderRadius: 20,width: 40,height: 40,top: 10,alignItems: "center",justifyContent: "center",},modalContainer: {justifyContent: "center",alignItems: "center",position: "absolute",margin: 60,top: 10,left: 50,},});export default ModalScreen;


7. App.js

import React from "react";import { Provider as StateProvider } from "react-redux";import store from "./src/redux/store";import MainStackNavigator from "./src/navigation/AppNavigator";export default function App() {return (<StateProvider store={store}><MainStackNavigator /></StateProvider>);}

19. The final output of the demo application

Here is the final output of the demo app:

That’s all about in this article.


Conclusion

In this article, we understood how to use Redux with React Hooks by building a real React Native application. This article showed the demo code step by step to use Redux with React Hooks by building a real React Native application. The addition to hooks in react-redux such as useSelector and useDispatch reduces the need to write plentiful boilerplate code and also provides the advantage to use functional components. We also discussed better understanding of the basics of react navigation in real React native application.

Thanks for reading! I hope you enjoyed and learned about Redux and React Hooks practical usage in React Native application. Reading is one thing, but the only way to master it is to do it yourself.

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