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React Native

React Native — Images, Views, and Text

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React Native is a mobile development that’s based on React that we can use to do mobile development.

In this article, we’ll look at how to use it to create an app with Reac.

Uri Data Images

We can add images for a base64 URI.

For example, we can write:

import { StatusBar } from 'expo-status-bar';
import React from 'react';
import { Image, StyleSheet, View } from 'react-native';

export default function App() {
  return (
    <View style={styles.container}>
      <Image
        style={{
          width: 51,
          height: 51,
          resizeMode: 'contain'
        }}
        source={{
          uri:
            'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADMAAAAzCAYAAAA6oTAqAAAAEXRFWHRTb2Z0d2FyZQBwbmdjcnVzaEB1SfMAAABQSURBVGje7dSxCQBACARB+2/ab8BEeQNhFi6WSYzYLYudDQYGBgYGBgYGBgYGBgYGBgZmcvDqYGBgmhivGQYGBgYGBgYGBgYGBgYGBgbmQw+P/eMrC5UTVAAAAABJRU5ErkJggg=='
        }}
      />
      <StatusBar style="auto" />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});

We just set the uri property to set the image URI.

We should only use this for small images.

Background Image

For example, we can write:

import { StatusBar } from 'expo-status-bar';
import React from 'react';
import { ImageBackground, StyleSheet, View, Text } from 'react-native';

export default function App() {
  return (
    <View style={styles.container}>
      <ImageBackground source={require('./assets/fork.jpg')} style={{ width: '100%', height: '100%' }}>
        <Text>Inside</Text>
      </ImageBackground>
      <StatusBar style="auto" />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});

We used the ImageBackground component to add the background image.

Then we can have things like text inside it.

View

A View is a container that supports layouts with flexbox, styles, touch handling, and accessibility controls.

For example, we can write:

import React from 'react';
import { View, Text } from 'react-native';

export default function App() {
  return (
    <View
      style={{
        flexDirection: "row",
        height: 100,
        padding: 20
      }}
    >
      <View style={{ backgroundColor: "green", flex: 0.3 }} />
      <View style={{ backgroundColor: "red", flex: 0.5 }} />
      <Text>Hello World!</Text>
    </View>
  );
}

The outer View component is a flexbox container for the inner View components.

We can set the backgroundColor for views.

And we can add the Text component to add the text.

Text

The Text component is a component that’s used for displaying text.

For example, we can write:

import React, { useState } from 'react';
import { View, Text, StyleSheet } from 'react-native';

const onPressTitle = () => {
  console.log("title pressed");
};

export default function App() {
  const titleText = useState("Bird's Nest");
  const bodyText = useState("This is not really a bird nest.");

  return (
    <View
      style={{
        flexDirection: "row",
        height: 100,
        padding: 20
      }}
    >
      <Text style={styles.baseText}>
        <Text style={styles.titleText} onPress={onPressTitle}>
          {titleText}
          {"n"}
        </Text>
        <Text numberOfLines={5}>{bodyText}</Text>
      </Text>
    </View>
  );
}

const styles = StyleSheet.create({
  baseText: {
    fontFamily: "Cochin"
  },
  titleText: {
    fontSize: 20,
    fontWeight: "bold"
  }
});

We can add the Text component to add some text.

We add the onPress prop and pass in an event handler to add an event handling for touching the text.

Conclusion

We can add URIs for images and background images with React Native.

Also, we can add View components for containers and Text component for text.

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