React Native Tutorial by The Net Ninja - Notes

Youtube Link: https://www.youtube.com/watch?v=ur6I5m2nTvk&list=PL4cUxeGkcC9ixPU-QkScoRBVxtPPzVjrQ

Repo: https://github.com/iamshaunjp/react-native-tutorial

Documentation: https://reactnative.dev/docs/getting-started

Local folder: E:\NMS\CURSOS\REACT-NATIVE-NINJA\react-native-tutorial

components lib: https://reactnativeelements.com/docs/header

Initial commands – Configuration

Android studio installation: Intel® HAXM installation failed. To install Intel® HAXM follow the instructions found at: https://software.intel.com/android/articles/installation-instructions-for-intel-hardware-accelerated-execution-manager-windows

Expo documentation: https://docs.expo.io/

npm install --global expo-cli
expo init myproject
npm start

Full examples:

Todo App: https://github.com/manolosolalinde/react-native-tutorial/tree/lesson-15

The reviews App: https://github.com/manolosolalinde/react-native-tutorial/tree/lesson-35

Tutorial structure:

lesson-2 to lesson-8: setup and basics

lesson-9 to lesson-15: Todo App

lesson-16 to lesson-35: The reviews App

Views, text and styles

Note: React native does not use css. It emulates the idea of css.

Note: Styles are not automatically inherited.

In general views are used instead of div.

Due to the lack of DOM, React Native doesn’t use tags like: div, section, span, input, etc. But don’t worry, almost every HTML tag has an equivalent React Native component, so we are able to use the same mindset of the web to develop with React Native components View, Text, TextInput, etc.

Examples

ScrollView, Button, TextInput:

<ScrollView> 
    <Button title='update state' onPress={clickHandler}/>
    <TextInput
            multiline
            keyboardType='numeric' 
            placeholder='e.g. John Doe'
            onChangeText={()=>setName()}
            style={styles.input}/>
<ScrollView/>

Flatlist, touchable component:

<View style={styles.container}>
      <FlatList 
        numColumns={2}
        keyExtractor={(item) => item.id} 
        data={people} 
        renderItem={({ item }) => ( 
        <TouchableOpacity onPress={()=>pressHandler(item.id)}>
          <Text style={styles.item}>{item.name}</Text>
        </TouchableOpacity>
        )}
      />
    </View>

Alert:

// jsx
      Alert.alert('OOPS', 'Todo must be over 3 characters long', [
        {text: 'Understood', onPress: () => console.log('alert closed') }
      ]);

Keyboard dismiss:

<TouchableWithoutFeedback onPress={() => {
      Keyboard.dismiss();
      console.log('dismissed');
    }}>
      <View style={styles.container}>
        <Header />
        <View style={styles.content}>
          <AddTodo submitHandler={submitHandler} />
          <View style={styles.list}>
            <FlatList
              data={todos}
              renderItem={({ item }) => (
                <TodoItem item={item} pressHandler={pressHandler} />
              )}
            />
          </View>
        </View>
      </View>
    </TouchableWithoutFeedback>

Flexbox:

export default function Sandbox() {
  return (
    <View style={styles.container}>
      <Text style={styles.boxOne}>one</Text>
      <Text style={styles.boxTwo}>two</Text>
      <Text style={styles.boxThree}>three</Text>
      <Text style={styles.boxFour}>four</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    paddingTop: 40,
    backgroundColor: '#ddd',
    flexDirection: 'row',
    justifyContent: 'space-around',
    alignItems: 'center',
    height: '100%',
  },
  boxOne: {
    flex: 1,
    backgroundColor: 'violet',
    padding: 10,
  },
  boxTwo: {
    flex: 2,
    backgroundColor: 'gold',
    padding: 10,
    alignSelf: 'flex-end',
  },
  boxThree: {
    flex: 1,
    backgroundColor: 'coral',
    padding: 10,
  },
  boxFour: {
    flex: 3,
    backgroundColor: 'skyblue',
    padding: 10,
    alignSelf: 'flex-start',
  }
});

Icons:

https://docs.expo.io/guides/icons/

import { MaterialIcons } from '@expo/vector-icons';
export default function TodoItem({ pressHandler, item }) {
  return (
    <TouchableOpacity onPress={() => pressHandler(item.key)}>
      <View style={styles.item}>
        <MaterialIcons name='delete' size={18} color='#333' />
        <Text style={styles.itemText}>{item.text}</Text>
      </View>
    </TouchableOpacity>
  )
}

Fonts:

– Documentation: https://docs.expo.io/guides/using-custom-fonts/?redirected

– Installation:

expo install expo-font @expo-google-fonts/nunito
npm install expo-app-loading
  • Example: 
import React from 'react';
import AppLoading from 'expo-app-loading';
import Home from './screens/home';
import { useFonts, Nunito_400Regular, Nunito_700Bold } from '@expo-google-fonts/nunito';

export default function App() {
    let [fontsLoaded] = useFonts({
        Nunito_400Regular,
        Nunito_700Bold,
    });
    if (!fontsLoaded) {
        return <AppLoading />;
    }  
    else {
        return <Home />;
    }
}

lesson-18 – Global Styles:

Just create a file in styles -> global.js and create and do:

(nothing weird)

import { StyleSheet } from 'react-native';
export const globalStyles = StyleSheet.create({
  titleText: {
    fontSize: 18,
    fontWeight: 'bold',
    color: '#333',
  },
  paragraph: {
    marginVertical: 8,
    lineHeight: 20,
  },
  container: {
    flex: 1,
    padding: 20,
  },
});

lesson-19 – React Navigation Configuration

# install react-navigation 5.0
npm install @react-navigation/native
npm install @react-navigation/stack
expo install react-native-gesture-handler react-native-reanimated react-native-screens react-native-safe-area-context @react-native-community/masked-view
npm install react-navigation-stack

lesson-20 – Stack Navigator

Installs for react navigator 5.0x:

routes/homeStack.js:

import React from "react";
import { NavigationContainer } from "@react-navigation/native";
import { createStackNavigator } from "@react-navigation/stack";
import Home from "../screens/home";
import ReviewDetails from "../screens/reviewDetails";

const { Navigator, Screen } = createStackNavigator();

const HomeNavigator = () => (
  <Navigator headerMode="none">
 {/* //other options: "float", "screen" */}
    <Screen name="Details" component={ReviewDetails} />
    <Screen name="Home" component={Home} />
  </Navigator>
);

export const AppNavigator = () => (
  <NavigationContainer>
    <HomeNavigator />
  </NavigationContainer>
);

And bind it into the App.js root component:

...
import { AppNavigator } from "./routes/HomeStack";
...
if (fontsLoaded) {
    return <AppNavigator />;
  } else {
   ...
  }

lesson-21 – Example navigation:

export default function Home({ navigation }) {

  const pressHandler = () => {
    navigation.navigate('ReviewDetails');
    // navigation.goBack();
    // navigation.push('ReviewDetails'); 
  }

  return (
    <View style={globalStyles.container}>
      <Text style={globalStyles.titleText}>Home Screen</Text>
      <Button title='to review details screen' onPress={pressHandler} />
    </View>
  );
}

React Native Tutorial #22 – Passing Data Between Screens

Navigation documentation: https://reactnavigation.org/docs/params

React Native Tutorial #23 – Navigation Options

React Native Tutorial #24 – Drawer Navigation

npm install @react-navigation/drawer

./routes/drawer.js

import React from 'react';
import { createDrawerNavigator } from '@react-navigation/drawer';
import { NavigationContainer } from '@react-navigation/native';

import { HomeNavigator } from './homeStack'
import { AboutNavigator } from './aboutStack';

const Drawer = createDrawerNavigator();

export const AppDrawer = () => {
  return (
    <NavigationContainer>
      <Drawer.Navigator headerMode="screen" initialRouteName="Home">
        <Drawer.Screen name="Home" component={HomeNavigator} />
        <Drawer.Screen name="About" component={AboutNavigator} />
      </Drawer.Navigator>
    </NavigationContainer> 
  );
}

React Native Tutorial #30 – Formik Forms (part 1)

npm install formik

Formik Example:

import React from 'react';
import { StyleSheet, Button, TextInput, View, Text } from 'react-native';
import { globalStyles } from '../styles/global.js';
import { Formik } from 'formik';
import * as yup from 'yup';
import FlatButton from '../shared/button.js';

const reviewSchema = yup.object({
  title: yup.string()
    .required()
    .min(4),
  body: yup.string()
    .required()
    .min(8),
  rating: yup.string()
    .required()
    .test('is-num-1-5', 'Rating must be a number 1 - 5', (val) => {
      return parseInt(val) < 6 && parseInt(val) > 0;
    }),
});

export default function ReviewForm({ addReview }) {

  return (

    <View style={globalStyles.container}>
      <Formik
        initialValues={{ title: '', body: '', rating: '' }}
        validationSchema={reviewSchema}
        onSubmit={(values, actions) => {
          actions.resetForm(); 
          addReview(values);
        }}
      >
        {props => (
          <View>
            <TextInput
              style={globalStyles.input}
              placeholder='Review title'
              onChangeText={props.handleChange('title')}
              onBlur={props.handleBlur('title')} 
              value={props.values.title}
            />
            {/* only if the left value is a valid string, will the right value be displayed */}
            <Text style={globalStyles.errorText}>{props.touched.title && props.errors.title}</Text>
            <FlatButton onPress={props.handleSubmit} text='submit' />
          </View>
        )}
      </Formik>
    </View>
  );
}

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