Category: React Native Answers

Sometimes, we want to add a full screen background image with React Native.

In this article, we’ll look at how to add a full screen background image with React Native.

How to add a full screen background image with React Native?

To add a full screen background image with React Native, we can set the flex style to 1.

For instance, we write:

import * as React from 'react';
import { Text, View, StyleSheet, Image } from 'react-native';
import Constants from 'expo-constants';

import { Card } from 'react-native-paper';

const styles = StyleSheet.create({
  container: {
    flex: 1,
    width: null,
    height: null,
  },
});

const App = () => {
  return (
    <View style={styles.container}>
      <Image source={require('./assets/snack-icon.png')} style={styles.container}></Image>
    </View>
  );
};
export default App;

to add the styles.container styles object that sets flex to 1 on the View and Image so they both stretch to fit their parent container.

We add the image with the Image component.

The source has the image path.

As a result, the image should be full screen.

Conclusion

To add a full screen background image with React Native, we can set the flex style to 1.

Sometimes, we want to display a hyperlink in a React Native app.

In this article, we’ll look at how to display a hyperlink in a React Native app.

How to display a hyperlink in a React Native app?

To display a hyperlink in a React Native app, we can use the Linking.openURL method.

For instance, we write:

import * as React from 'react';
import { View, StyleSheet, Linking } from 'react-native';
import { Text, Button } from 'react-native-paper';

const MyComponent = () => {
  return (
    <View>
      <Text
        style={{ color: 'blue' }}
        onPress={() => Linking.openURL('http://example.com')}>
        example
      </Text>
    </View>
  );
};

export default MyComponent;

to create a Text component that looks like a link by setting its content’s color to blue.

Then we set the onPress prop of it to a function that calls Linking.openURL with the URL that we want to open.

And we put the link text between the Text tags.

Conclusion

To display a hyperlink in a React Native app, we can use the Linking.openURL method.

Sometimes, we want to show or hide components in React Native.

In this article, we’ll look at how to show or hide components in React Native.

How to show or hide components in React Native?

To show or hide components in React Native, we can write ternary expressions to display components according to a value.

For instance, write:

import * as React from 'react';
import { View, StyleSheet } from 'react-native';
import { Text, Button } from 'react-native-paper';

const MyComponent = () => {
  const [show, setShow] = React.useState(false);
  return (
    <View>
      <Button onPress={() => setShow((s) => !s)}>toggle</Button>
      {show ? <Text>show</Text> : <Text>hide</Text>}
    </View>
  );
};

export default MyComponent;

to display ‘show’ if show is true and ‘hide’ otherwise.

We control the value of show with the toggle button.

To change it, we set onPress to a function that calls setShow with a callback to toggle the show value.

Therefore, when we press the button, we see the text toggle between ‘show’ and ‘hide’.

Conclusion

To show or hide components in React Native, we can write ternary expressions to display components according to a value.

Sometimes, we want to get the size of a View in React Native.

In this article, we’ll look at how to get the size of a View in React Native.

How to get the size of a View in React Native?

To get the size of a View in React Native, we can get them from the parameter of the onLayout callback.

For instance, we write:

import * as React from 'react';
import { View, StyleSheet } from 'react-native';
import { Text } from 'react-native-paper';

const MyComponent = () => {
  const [dims, setDims] = React.useState({});
  return (
    <View
      onLayout={(event) => {
        const { x, y, width, height } = event.nativeEvent.layout;
        setDims({ x, y, width, height });
      }}>
      <Text>{JSON.stringify(dims)}</Text>
    </View>
  );
};

export default MyComponent;

to set onLayout prop of the View to a function that gets the x, y, width and height properties from event.nativeEvent.layout.

x and y are the coordinates of the top left corner of the View.

width and height are its width and height.

Conclusion

To get the size of a View in React Native, we can get them from the parameter of the onLayout callback.

Sometimes, we want to align content to the right in React Native.

In this article, we’ll look at how to align content to the right in React Native.

How to align content to the right in React Native?

To align content to the right in React Native, we can use flexDirection and justifyContent.

For instance, we write:

import * as React from 'react';
import { View, StyleSheet } from 'react-native';
import { Text } from 'react-native-paper';

const MyComponent = () => {
  return (
    <View style={{ flexDirection: 'row', justifyContent: 'flex-end' }}>
      <Text>Hello World!</Text>
    </View>
  );
};

export default MyComponent;

to set the style prop of the View to { flexDirection: 'row', justifyContent: 'flex-end' }.

Now we see that ‘Hello World!’ is displayed at the right end of the screen.

Conclusion

To align content to the right in React Native, we can use flexDirection and justifyContent.