Category: JavaScript

Sometimes, we want to make dynamic styles in React Native.

In this article, we’ll look at how to make dynamic styles in React Native.

How to make dynamic styles in React Native?

To make dynamic styles in React Native, we can return style objects from functions.

For instance, we write:

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

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

const createStyles = (background) => {
  return {
    borderRadius: 12,
    background,
  };
};

const App = () => {
  return (
    <View style={{ flex: 1, ...createStyles('yellow') }}>
      <Text>hello world</Text>
    </View>
  );
};
export default App;

to create the createStyles function that returns an object with some style properties.

Then we spread the returned style object into the object we set as the value of the style prop of the View.

Conclusion

To make dynamic styles in React Native, we can return style objects from functions.

Sometimes, we want to style a TextInput in React Native for password input

In this article, we’ll look at how to style a TextInput in React Native for password input.

How to style a TextInput in React Native for password input?

To style a TextInput in React Native for password input, we can set the secureTextEntry prop to true.

For instance, we write:

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

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

const App = () => {
  return (
    <View style={{ flex: 1 }}>
      <TextInput secureTextEntry />
    </View>
  );
};
export default App;

to add the secureTextEntry prop to the TextInput add a password input.

Conclusion

To style a TextInput in React Native for password input, we can set the secureTextEntry prop to true.

Sometimes, we want to add a fixed footer with React Native.

In this article, we’ll look at how to add a fixed footer with React Native.

How to add a fixed footer with React Native?

To add a fixed footer with React Native, we can add a ScrollView on top of the footer View.

For instance, we write:

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

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

const App = () => {
  return (
    <View style={{ flex: 1 }}>
      <ScrollView>main</ScrollView>
      <View>
        <Text>footer</Text>
      </View>
    </View>
  );
};
export default App;

to set the outer View to have the flex style set to 1 to make it fill the screen.

Then we add a ScrollView that fills the height of the outer View except for the height of the footer View.

Now we should see ‘footer’ stays at the bottom.

Conclusion

To add a fixed footer with React Native, we can add a ScrollView on top of the footer View.

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.