react-native-themes

Getting started

$ npm install react-native-themes --save OR $ yarn add react-native-themes --save

Steps of Usage

Step 1 - Define the color themes.

//colors.js
import Theme from 'react-native-themes';

const colors = new Theme.Colors({
     DEFAULT_THEME: {
        backgroundColor: '#fff',
    },
    DARK_THEME: {
        backgroundColor: '#3b5998',
    }
   
});

export default colors;

Note - Do not forget to import this file at the top of your component(ie. App.js).

Step 2 - Apply theme on App Launch

By default the first theme in the colors template is selected. In the root component of your app like App.js, register ThemeListeners for the component to act on the default theme applied.

//App.js
componentWillMount() {
    this.listener = Theme.addThemeListener(() => {
      this.setState({});
    });
}

componentWillUnmount() {
    Theme.removeThemeListener(this.listener);
}

Step 3 - Create Stylesheet

Create the stylesheet for your components as a function.

Example -

import { StyleSheet } from 'react-native';

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

export default styles;

Step 4 - Apply colors on Components

In the components where you would like to apply the theme colors call the getStyles(stylesheet) function in componentWillMount().

import Theme from 'react-native-themes';
import stylesheet from './styles'; //Stylesheet created in Step 2

let styles;

class MyComponent extends Component {
    ...
    
    componentWillMount(){
        styles = Theme.getStyles(stylesheet);
        //use the styles for styling the components in render methods.
    }
    
    ...
}

Note For inline styles, you can get the colors by calling Theme.getColors()

Example

    render(){
        const colors = Theme.getColors();
        return (
        <View style={{ backgroundColor: colors.backgroundColor, flex:1 }}>
            ...
        </View>    
        );
    }

Step 5 - Change Color Theme

By default the first color theme will be applied. If you want to change the color theme you need to call the Theme.setColorTheme(themeName, callback)

• themeName - Name of the theme defined in Step 1.
• callback - Callback function to be called after theme is set

Example-

    import Theme from 'react-native-themes';
    
    ...
    
    render(){
        //have to fetch styles again as the Theme Change 
        //will re-render the Component.
        styles = Theme.getStyles(stylesheet);
        
        return (
        ...
            <Button
              onPress={() => {
                if (Theme.getColorTheme() === 'DEFAULT_THEME') {
                  Theme.setColorTheme('DARK_THEME', () => {
                    this.setState({}); //force re-render of the component
                  });
                } else {
                  Theme.setColorTheme('DEFAULT_THEME', () => {
                    this.setState({}); //force re-render of the component
                  }));
                }
              }}
              title="Change Theme" />
          ...       
        );
    }

Feedback

Bugs? Comments? Features? PRs and Issues happily welcomed!

Contributor

Sandeep Tiwari