React Native working with NativeBase: WARN NativeBase: The contrast ratio of 1:1 for darkText on transparent

user_4333490 0
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I'm programming a React Native App using NativeBase.io

In my app where I use NativeBase I am getting the following error.....how do I fix this?

Here is the error:

WARN NativeBase: The contrast ratio of 1:1 for darkText on transparent falls below the WCAG recommended absolute minimum contrast ratio of 3:1. https://www.w3.org/TR/2008/REC-WCAG20-20081211/#visual-audio-contrast-contrast InputBase@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:193716:28 RCTView View @http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:150602:25 Box@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:191721:24 InputAdvance@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:193858:33 Input@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:193651:24 RCTView View @http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:150602:25 Box@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:191721:24 UserListScreen@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:223372:50 StaticContainer@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:234421:17 EnsureSingleNavigator@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:230142:24 SceneView@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:234305:22 RCTView View RCTView View Background@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:236500:21 Screen@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:237782:108 RNSScreen AnimatedComponent@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:67782:80 AnimatedComponentWrapper Screen@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:238098:36 MaybeScreen@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:237954:24 RNSScreenContainer ScreenContainer@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:238211:31 MaybeScreenContainer@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:237923:23 RCTView View SafeAreaProviderCompat@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:237712:24 BottomTabView@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:226059:30 @http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:234075:24 BottomTabNavigator@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:225921:32 EnsureSingleNavigator@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:230142:24 BaseNavigationContainer@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:229651:28 ThemeProvider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:235690:21 NavigationContainerInner@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:235550:26 SSRProvider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:193075:25 ToastProvider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:204142:24 PortalProvider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:201313:50 HybridProvider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:214396:24 RNCSafeAreaProvider SafeAreaProvider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:154679:24 NativeBaseConfigProviderProvider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:148509:27 ThemeProvider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:145479:38 NativeBaseProvider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:214282:33 Provider@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:216267:21 App@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:108372:54 RCTView View RCTView View AppContainer@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:75251:36 DanceConnectyCube(RootComponent)@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=org.reactjs.native.example.DanceConnectyCube:82468:28 undefined

wcag native-base react-native
4 Answers

I also had the same warning. I tried some colour changes in my components and I found the problem, input bg colour is white and also my view background is "light.100". I changed my colour to "transparent" or "muted.500" and the warning disappeared. This warning allows us to better manage colours for dark mode.

user_121406340

If you are following the design from your designer, And you can't change that color, you can skip the warning with LogBox.

Add below lines to your index.js file

import {LogBox} from 'react-native';

LogBox.ignoreLogs(['NativeBase:']);
user_55580520

In my case the problem was use of variant="outline" prop to get an outlined button. Changing colours or colour-schemes didn't worked for me. Using borderWidth: 1 as style prop instead, made the error disappear.

user_99152100

I ran into this with an outline button. The warning "The contrast ratio of 1:1 for darkText on transparent" is referring to the background color of the button.

Here's a dark-on-white, light-on-black outline button that works in both light and dark modes, without hard-coding color values (other than black and white):

import { useContrastText } from 'native-base';

const bgLight = "white";
const bgDark = "black";
const lightContrastColor = useContrastText(bgLight);
const darkContrastColor = useContrastText(bgDark);

<Button
    variant="outline"
    colorScheme="light"
    _light={{ bg: bgLight, borderColor: lightContrastColor, _text: { color: lightContrastColor } }}
    _dark={{ bg: bgDark, borderColor: darkContrastColor, _text: { color: darkContrastColor } }}
    onPress={() => null}>Lorem Ipsum</Button>
user_5942110
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