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@nativescript/theme-switcher ​

Contents ​

Installation ​

cli
npm install @nativescript/theme-switcher

Usage ​

Register the Themes ​

Use the initThemes() function to register the themes to switch from.

Call this function in the app's app.ts or main.ts file, before the app starts.

ts
import { initThemes, switchTheme } from '@nativescript/theme-switcher'

// first initialize the themes
initThemes({
  // default is optional - will be auto-applied after initializing (*)
  default: () => import('theme-loader!./themes/default.scss'),
  red: () => import('theme-loader!./themes/red.scss'),
  green: () => import('theme-loader!./themes/green.scss'),
})

Switch Themes ​

To switch themes, call the [switchTheme()] method passing it the name of the theme to switch to.

ts
switchTheme('red')
switchTheme('green')

Note

The theme-loader! prefix is used to apply a custom loader that prevents the styles from being auto-applied, and instead applied on-demand by the theme switcher. It requires @nativescript/webpack@5+ to work properly.

Note for TypeScript users

TypeScript does not know about theme-loader or css/scss files, in order to supress the type errors when calling import('theme-loader!./path/to/theme.css') you can add

ts
/// <reference path="./node_modules/@nativescript/theme-switcher/shims.d.ts" />

To your references.d.ts, or use // @ts-ignore to supress the errors locally.

Switch multiple themes simultaneously ​

If you need to switch multiple themes simultaneously, you can initialize as many switchers as you need. Each switcher will load CSS and persist (unless disabled) the last selected theme.

Can be useful if your app can switch different parts of the theme individually. For example

  1. switcher1 switches button styles
  2. switcher2 switches font styles
  3. etc.
ts
import { ThemeSwitcher } from '@nativescript/theme-switcher'

const switcher1 = new ThemeSwitcher('switcher1')
const switcher2 = new ThemeSwitcher('switcher2')

switcher1.initThemes({
  /* ... */
})
switcher2.initThemes({
  /* ... */
})

switcher1.switchTheme(/* ... */)
switcher2.switchTheme(/* ... */)

API ​

initThemes() ​

ts
initThemes(themes, options)

Register the themes to be switched from.

ParameterTypeDescription
themesThemeDefinitionAn object with the theme name as the key, and a loader function that returns the theme css (css string, ast, optionally async). default will be applied initially, if set as a theme.
optionsThemeSwitcherOptionsOptional: Themes initialization settings.

ThemeDefinition ​

ts
interface ThemeDefinition {
  [name: string]: () => any
}

ThemeSwitcherOptions ​

OptionTypeDescription
persistentbooleanOptional: Defaults to true. If persistent is enabled, the last selected theme will be saved to ApplicationSettings and automatically restored when initThemes() is called.
persistenceKeystringOptional: The key to the selected theme under on the device storage. Defaults to __theme_switcher_default

switchTheme() ​

ts
switchTheme(themeName)

Used to switch from the current theme to the specified one.

ParameterTypeDescription
themeNamestringThe name of the theme to switch to.

loadDefaultTheme() ​

ts
import { loadDefaultTheme } from '@nativescript/theme-switcher'

loadDefaultTheme()

Loads the last selected theme if persistence is enabled, otherwise loads "default" if it exists.

Demo App ​

Try out the plugin's demo with the NativeScript Preview app at StackBlitz.

License ​

Apache License Version 2.0

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