React Native Background Color Height Continuous With Scrolling

React Native Color

Introduction to React Native Color

Colors are an integral part of any visual thing. In terms of software, applications, websites – colors play an important role in enhancing their User Interface and User Experience. It also supports Color to enhance the User Interface of websites or apps. The styling of React Native Components is done using JavaScript. The color properties are just like the way CSS works on the web. There are many different color APIs which helps us to take advantage of the design of the platform and the preferences of a user.

  • PlatformColor is used to reference the color system of the platform.
  • DynamicColorIOS is used only for iOS and it helps us in specifying the colors which are suitable for using in Dark and Light Modes.

In this article, we will go through different examples to understand the application.

Syntax

The Syntax are given below:

1. Red Green Blue (RGB)

It supports rgba() and rgb() in both functional and hexadecimal notation.

'#3cf' (#rgb)
'#b4ff33' (#rrggbb)
'#eba3' (#rgba)
'#ff00ff00' (#rrggbbaa)
'rgb(235, 163, 63)'
'rgba(90, 224, 171, 1.0)'

2. Hue Saturation Lightness (HSL)

It supports hsla() and hsl() in functional notation.

'hsl(156, 69%, 62%)'
'hsla(307, 69%, 62%, 1.0)'

3. Colorints

In RGB color mode, It supports colors as an int values.

0xff00ff00 (0xrrggbbaa)

4. Named Colors

One can use color name strings as values in React Native.

aqua (#00ffff)
chartreuse (#7fff00)
darkcyan (#008b8b)

Working of React Native Color

It can be used in numerous ways. We have stated the syntaxes above which can be used in React Native to apply colors. Colors can be applied using RGB notations, Hue Saturation Lightness values. It can be applied as integer values of colors in RGB mode and the name strings of different colors can also be used to apply colors. Both rgba() and rgb() notations are accepted in react native.

Examples of React Native Color

Following are the examples as given below:

1. Basic Example of Coloring an Image

In the example below, we have colored the background through backgroundColor: "cyan" and colored the image using tintColor: "yellow". The files used to implement the course below are:

React Native Color-1.1

App.js

import React from "react";
import { View
, Image } from "react-native";
class App extends React.Component {
render() {
return (
<View style={{ flex: 1, backgroundColor: "cyan" }}>
<Image
style={{
flex: 1,
resizeMode: "contain",
tintColor: "yellow",
padding: 15
}}
source={{ uri: "https://cdn.onlinewebfonts.com/svg/img_541880.png" }}
/>
</View>
);
}
}
export default App;

index.js

import { AppRegistry } from "react-native";
import App from "./App";
AppRegistry.registerComponent("App", () => App);
AppRegistry.runApplication("App", {
rootTag: document.getElementById("root")
});

Output:

React Native Color-1.2

2. React Native Color with ColorPicker

In the example below, we have used the colorpicker to choose the color to display and get edited in the box border. The files used to implement the code below are:

React Native Color-1.3

ColorPicker.js

import React from "react";
import { CustomPicker } from "react-color";
import {
EditableInput
, Hue
, Saturation
} from "react-color/lib/components/common";
export constMyPicker = ({ hex, hsl, hsv, onChange }) => {
const styles = {
hue: {
height: 100,
position: "relative",
marginBottom: 40
},
saturation: {
width: 200,
height: 200,
position: "relative"
},
input: {
height: 35,
border: `1px solid ${hex}`,
paddingLeft: 30
},
swatch: {
width: 60,
height: 40,
background: hex
}
};
return (
<div>
<div style={styles.hue}>
<Hue hsl={hsl} onChange={onChange} />
</div>
<div style={styles.saturation}>
<Saturation hsl={hsl} hsv={hsv} onChange={onChange} />
</div>
<div style={{ display: "flex" }}>
<EditableInput
style={{ input: styles.input }}
value={hex}
onChange={onChange}
/>
<div style={styles.swatch} />
</div>
</div>
);
};
export default CustomPicker(MyPicker);

index.js

import React from "react";
import ReactDOM from "react-dom";
import ColorPicker from "./ColorPicker";
function App() {
return (
<div>
<ColorPickercolor="#E829DE" />
</div>
);
}
constrootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
styles.css
.App {
font-family: 'Times New Roman'
, Times
, serif
text-align: center;
}

Output:

React Native Color-1.4

3. React Native Color Using processColor

In the example below, we have imported the processColor from react native like.

import { processColor } from "react-native";

and have used the function hexStringFromCSSColorand used the ("rgba(209,0,255,0.5)")for coloring the background.

The files used to implement the code below are:

React Native Color-1.5

App.js

import React from "react";
import { View
, processColor } from "react-native";
function hexStringFromCSSColor(color) {
constprocessedColor = processColor(color);
constcolorStr = `${processedColor.toString(16)}`;
constwithoutAlpha = colorStr.substring(2, colorStr.length);
const alpha = colorStr.substring(0, 2);
return `#${withoutAlpha}${alpha}`;
}
class App extends React.Component {
render() {
const hex = hexStringFromCSSColor("rgba(209,0,255,0.5)");
return <View style={{ flex: 1, backgroundColor: hex }} />;
}
}
export default App;

index.js

import { AppRegistry } from "react-native";
import App from "./App";
AppRegistry.registerComponent("App", () => App);
AppRegistry.runApplication("App", {
rootTag: document.getElementById("root")
});

Output:

React Native Color-1.6

4. React Native Color Changing with Buttons

In the example below, the different buttons are used to change the background color of the different boxes. The files used to implement the code below are:

React Native Color-1.7

App.js

import React
, { useRef } from "react";
import { Button
, StyleSheet
, Text
, View } from "react-native";
import { animated } from "react-spring/native";
constAnimatedView = animated(View);
const styles = StyleSheet.create({
item: {
alignItems: "center",
justifyContent: "center",
width: 200,
height: 100,
margin: 15,
backgroundColor: "pink"
},
text: {
color: "white"
}
});
export default function App() {
const cache = useRef({
toggle1: false,
toggle2: false
});
const ref1 = useRef(null);
const ref2 = useRef(null);
return (
<View>
<View ref={ref1} style={styles.item}>
<Text style={styles.text}>BOX 1</Text>
</View>
<Button
onPress={() => {
cache.current.toggle1 = !cache.current.toggle1;
ref1.current.setNativeProps({
style: { backgroundColor: cache.current.toggle1 ? "lightgreen" : "orange" }
});
}}
title=" Box 1 - Change Color"
/>
<AnimatedView ref={ref2} style={styles.item}>
<Text style={styles.text}>BOX 2</Text>
</AnimatedView>
<Button
onPress={() => {
cache.current.toggle2 = !cache.current.toggle2;
ref2.current.setNativeProps({
style: { backgroundColor: cache.current.toggle2 ? "purple" : "brown" }
});
}}
title="Box 2 - Change Color"
/>
</View>
);
}

index.js

import { AppRegistry } from "react-native";
import App from "./App";
AppRegistry.registerComponent("App", () => App);
AppRegistry.runApplication("App", {
rootTag: document.getElementById("root")
});

Output:

Output-1.8

Output-1.9

Output-1.10

Output-1.11

React Native Color-1.12

Recommended Articles

This is a guide to React Native Color. Here we also discuss the introduction and working of react native color along with different examples and its code implementation. You may also have a look at the following articles to learn more –

  1. Styling in React Native
  2. React Native Debugger
  3. React Native Authentication
  4. React Native Router

heidrickower1948.blogspot.com

Source: https://www.educba.com/react-native-color/

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