Linear Gradient Taro

linear gradient fro taro, reference react-native-linear-gradient & react-native-web-linear-gradient add web and miniprogram support. the documentation modified from project react-native-linear-gradient.

Table of Contents

• Installation
• Usage and Examples
• Props
• Example App
• Troubleshooting
• Other Platforms

Installation

Using Yarn

yarn add linear-gradient-taro react-native-linear-gradient

With React Native >= 0.60

Run npx pod-install

Simple

The following code will produce something like this:

import LinearGradient from 'linear-gradient-taro';

// Within your render function
<LinearGradient colors={['#4c669f', '#3b5998', '#192f6a']}>
  <Text>
    Sign in with Facebook
  </Text>
</LinearGradient>

Horizontal gradient

Using the styles from above, set start and end like this to make the gradient go from left to right, instead of from top to bottom:

<LinearGradient start={{x: 0, y: 0}} end={{x: 1, y: 0}} colors={['#4c669f', '#3b5998', '#192f6a']}>
  <Text>
    Sign in with Facebook
  </Text>
</LinearGradient>

Animated Gradient

Check out Examples/AnimatedGradient (git clone this project, cd into it, npm install, open in Xcode and run) to see how this is done:

This gif was created using licecap - a great piece of free OSS

Transparent Gradient

The use of transparent color will most likely not lead to the expected result. transparent is actually a transparent black color (rgba(0, 0, 0, 0)). If you need a gradient in which the color is "fading", you need to have the same color with changing alpha channel. Example:

// RGBA

<LinearGradient colors={['rgba(255, 255, 255, 0)', 'rgba(255, 255, 255, 1)']} {...otherGradientProps} />

// Hex

<LinearGradient colors={['#FFFFFF00', '#FFFFFF']} {...otherGradientProps} />

Props

In addition to regular View props, you can also provide additional props to customize your gradient look:

colors

An array of at least two color values that represent gradient colors. Example: ['red', 'blue'] sets gradient from red to blue.

start

An optional object of the following type: { x: number, y: number }. Coordinates declare the position that the gradient starts at, as a fraction of the overall size of the gradient, starting from the top left corner. Example: { x: 0.1, y: 0.1 } means that the gradient will start 10% from the top and 10% from the left.

end

Same as start, but for the end of the gradient.

locations

An optional array of numbers defining the location of each gradient color stop, mapping to the color with the same index in colors prop. Example: [0.1, 0.75, 1] means that first color will take 0% - 10%, second color will take 10% - 75% and finally third color will occupy 75% - 100%.

<LinearGradient
  start={{x: 0.0, y: 0.25}} end={{x: 0.5, y: 1.0}}
  locations={[0,0.5,0.6]}
  colors={['#4c669f', '#3b5998', '#192f6a']}
  >
  <Text>
    Sign in with Facebook
  </Text>
</LinearGradient>

useAngle / angle / angleCenter

You may want to achieve an angled gradient effect, similar to those in image editors like Photoshop. One issue is that you have to calculate the angle based on the view's size, which only happens asynchronously and will cause unwanted flickr.

In order to do that correctly you can set { useAngle: true, angle: 45, angleCenter: { x: 0.5, y: 0.5} }, to achieve a gradient with a 45 degrees angle, with its center positioned in the view's exact center.

useAngle is used to turn on/off angle based calculation (as opposed to start/end). angle is the angle in degrees. angleCenter is the center point of the angle (will control the weight and stretch of the gradient like it does in photoshop.