Dark Mode Support

Zephyr supports dark mode out of the box using the useStyles and makeStyledComponent style helpers returned from createStyleBuilder. Both accept arguments classes and darkClasses that indicate:

• the baseline classes to apply;
• and the darkClasses to merge into the baseline classes if the user's color scheme preference is "dark".

Here's a simple example:

import { createStyleBuilder } from "react-native-zephyr";
import { View, Text } from "react-native";

// Setup your styling helpers
export const { makeStyledComponent } = createStyleBuilder();
export const StyledView = makeStyledComponent(View);
export const StyledText = makeStyledComponent(Text);

const App = () => {
  return (
    <StyledView
      classes={["flex:1", "bg:purple-100", "justify:center", "items:center"]}
      // 👇 gets merged into 👆 in dark mode.
      darkClasses={["bg:purple-800"]}
    >
      <StyledText
        classes={["text:5xl", "color:gray-800"]}
        darkClasses={["text:6xl", "color:gray-100"]}
      >
        Hey world
      </StyledText>
    </StyledView>
  );
};

This tiny bit of markup gives us something like the following.

A note about styles

The createStyleBuilder().styles function can be used outside of the React component lifecycle (you can use it anywhere!). Because of this, it is not tuned into the user's color scheme preference – and therefore does not support dark mode features. However, both useStyles and makeStyledComponent support dark mode, as they are aware of this setting.

Manually setting Color Scheme

Your app should be wrapped in a top-level StyleProvider (from react-native-zephyr). This component has a colorScheme?: "light" | "dark" | "auto" prop that allows you to:

• explicitly force the app into "light" mode via colorScheme="light";
• explicitly force the app into "dark" mode via colorScheme="dark";
• or use the user's color scheme preference to determine which mode via colorScheme="auto" (this is the default behavior).

So if you'd like to only offer light mode to start, you could do the following:

import { createStyleBuilder, StyleProvider } from "react-native-zephyr";
import { View } from "react-native";

// Setup your Zephyr and helpers
export const { makeStyledComponent } = createStyleBuilder();
export const StyledView = makeStyledComponent(View);

// Root app component
export const App = () => {
  return (
    // 👇 will force the app into "light" mode, regardless of device color scheme preference
    <StyleProvider colorScheme="light">
      <AppBody />
    </StyleProvider>
  );
}

// Somewhere inside your root app component
const AppBody = () => {
  return (
    <StyledView
      classes={["bg:blue-100"]}
      // 👇 will never be applied, regardless of device color scheme preference
      darkClasses={["bg:blue-800"]}
    />
  );
}