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2.0.6 • Public • Published

NativeScript Theme: Core V2

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Home of the core NativeScript theme 2.0 beta. The documentation of the beta theme will live here, until it gets final.

Breaking changes

  • The theme is now applied using Element selectors, if you need the old classes approach - it has moved to .compat CSS/SCSS files, e.g. core.compat.css and blue.compat.css.
  • Theme 2.0 beta requires some JavaScript to be loaded which helps with the styling.
  • Theme 2.0 replaces node-sass with dart-sass which is more up to date feature-wise and doesn't have a native dependency.


The core theme supports light and dark core styling and skins on top of that. In order to use the 2.0 beta theme, you will also need to include a small JS file in your project:

    import "nativescript-theme-core";

This JS takes care of updating several classes on the app root elements, until their inclusion in tns-core-modules.

To load the theme styling, just load the core and skin CSS:

    @import "~nativescript-theme-core/css/core.css";
    @import "~nativescript-theme-core/css/blue.css";

or alternatively SCSS:

    @import "~nativescript-theme-core/core";
    @import "~nativescript-theme-core/blue";

The theme will style your application using Element selectors - you don't need to add CSS classes on every element you need to style.

Additionally, if you need to create you own skin, you can start from the core theme - it includes the sizing and initial styling of the components without colorizing them too much.

Changing Core Theme

Changing the core theme from light to dark is now easier - instead of loading a new file, just get the root view and set the .ns-dark class to it - this will change all colorization to dark tones. For instance, if your page root is RadSideDrawer, just add a class to it, like this:

<drawer:RadSideDrawer class="ns-dark" xmlns:drawer="nativescript-ui-sidedrawer">

You can also do it from JavaScript like this, for instance:

import { getRootView } from "tns-core-modules/application";
getRootView().className += " ns-dark";

This of course won't remove your previously added classes.

More Root Classes

In addition to .ns-light and .ns-dark classes, the theme's little JavaScript file introduces .ns-root on the root element, .ns-android/.ns-ios depending on the current platform (which the theme extensively uses) and additionally .ns-portrait/.ns-landscape and .ns-phone/.ns-tablet, which should be self-explanatory. Of course .ns-portrait/.ns-landscape get updated on orientation change, so you can use it to show a two pane layout in landscape, for instance. The newest addition is .ns-statusbar-transparent since 2.0.4 - add this class to your root element, if you have enabled transparent status bar in the OS and your ActionBar gets underneath it.

Helper Functions and Mixins

There are several functions and mixins in the core theme, that can be used in your projects, as long as you're using SASS/SCSS.

You can easily get light/dark colors:

Button {
    color: light(primary);
    .ns-dark & {
        color: dark(primary);

or alternatively set them both in one go - does the same as the upper example:

Button {
    @include colorize($color: primary);

You can darken/lighten a color depending on its background (darken for light theme and lighten for dark theme):

Button {
    @include colorize($contrasted-border-color: focus background 20%);

The above example uses the contrasted function to check the contrast level of the background and adjust the lightness of the focus color (the accent) according to it.

Kendo UI ThemeBuilder Support

The theme now supports inheriting the Kendo UI ThemeBuilder theme variables. Just head there, customize your Keno UI SASS theme and hit the Download button. You will get a ZIP with two files in it - the theme CSS that you can use to style your web app, and variables.scss - the one you need for your NativeScript theme. It will look something like this:

$swatch-name:Default Purple;
$border-radius: 10px;
$accent: #bf70cc;
$info: #3e80ed;
$success: #5ec232;
$warning: #fdce3e;
$error: #d51923;
$text-color: #656565;
$bg-color: #ffffff;
$base-text: #656565;
$base-bg: #f6f6f6;
$hovered-text: #656565;
$hovered-bg: #ededed;
$selected-text: #ffffff;
$selected-bg: #bf70cc;
$series-a: #ff6358;
$series-b: #ffd246;
$series-c: #78d237;
$series-d: #28b4c8;
$series-e: #2d73f5;
$series-f: #aa46be;

Take this file, add the following row under it:

@import '~nativescript-theme-core/index';

And load the file after your core theme. It should just work™. If it doesn't - head for the issues section.

Theme Classes and Compatibility

The old generic theme classes have been retired to avoid clashes with user code. They now live in the .compat world - if you want to use them, you should load them separately, like this:

    @import "~nativescript-theme-core/core.compat";
    @import "~nativescript-theme-core/blue.compat";

There might be bugs with these in the beta, you might want to hold off upgrading if you want to use the old classes.

As of 2.0, the theme now utilizes a simplified BEM approach for the new element classes, that might be needed here or there. For instance, the buttons need .-primary and .-outline modifiers, instead of the old .btn-primary and .btn-outline classes. All element classes (which are not needed by default, except if you want to style a component to look like another one) are namespaced, so for instance a button is .nt-button, an action bar is .nt-action-bar and a ListView is .nt-list-view.

Why Beta

  • Firstly, we want to gather feedback from the community and create a theme that is useful and if possible - beautiful.
  • Secondly, the theme needs the classes inside the core modules to work properly without loading additional JavaScript.
  • And thirdly - {N} core modules should have a way to propagate OS theme changes inside the app, so that it can act accordingly.

Hopefully these can be achieved until {N} 6.1.



Clone this repo, and then use the tns run command to launch the demo app on your device or emulator of choice.

tns run ios

// or

tns run android

If you’d like to toggle the color scheme from light to dark, open the sidedrawer, scroll down to "Themes" at the bottom, and toggle away.


NOTE: Only authorized authors can publish updates.

IMPORTANT: Always make sure you have run the demo app in iOS or Android to verify any changes as well as ensure the latest css has been built before doing the following:

  • Bump version in nativescript-theme-core.json
  • Adjust if any changes to the published README are needed.
npm run builder
cd nativescript-theme-core
npm publish

IMPORTANT: Never modify the contents of nativescript-theme-core folder directly. The builder creates that everytime and any change you make there will be overwritten.

Setup changelog generation:

npm install -g conventional-changelog-cli

Generate changelog workflow:

  1. Make changes
  2. Commit those changes - using these conventions.
  3. Make sure Travis turns green
  4. Bump version in package.json and nativescript-theme-core.json
  5. conventional-changelog -p angular -i -s
  6. Commit package.json and files
  7. Tag
  8. Push

Awesome Contributors

NathanWalker TheOriginalJosh tjvantoll NathanaelA triniwiz sis0k0
NathanWalker TheOriginalJosh tjvantoll NathanaelA triniwiz sis0k0
sitefinitysteve vakrilov bradmartin firescript valentinstoychev enchev
sitefinitysteve vakrilov  bradmartin   firescript   valentinstoychev   enchev  


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