React Native Skeleton Content

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Created to unblock us until the src package merges this pr. Fixes error: Animated node with ID 2 already exists

React native Skeleton Content, a simple yet fully customizable component made to achieve loading animation in a Skeleton-style. Works in both iOS and Android.

New Features

• The package has been rewritten to Hooks and is using the declarative react-native-reanimated package for animations
• It now supports nested layouts for children bones, see an example on this snack
• It finally supports percentages dimensions for bones, for any type of animation!

• React Native Skeleton Content
  • Installation
  • Usage
  • Props
  • Examples
  • Playground

Installation

npm install react-native-skeleton-content

Usage

1. Import react-native-skeleton-content:

import SkeletonContent from 'react-native-skeleton-content';

2. Once you create the SkeletonContent, you have two options:

• Child Layout : The component will figure out the layout of its bones with the dimensions of its direct children.
• Custom Layout : You provide a prop layout to the component specifying the size of the bones (see the Examples section below). Herunder is the example with a custom layout. A key prop for each child is optionnal but highly recommended.

export default function Placeholder() {
  return (
    <SkeletonContent
      containerStyle={{ flex: 1, width: 300 }}
      isLoading={false}
      layout={[
        { key: 'someId', width: 220, height: 20, marginBottom: 6 },
        { key: 'someOtherId', width: 180, height: 20, marginBottom: 6 }
      ]}
    >
      <Text style={styles.normalText}>Your content</Text>
      <Text style={styles.bigText}>Other content</Text>
    </SkeletonContent>
  );
}

3. Then simply sync the prop isLoading to your state to show/hide the SkeletonContent when the assets/data are available to the user.

export default function Placeholder () {
  const [loading, setLoading] = useState(true);
  return (
    <SkeletonContent
       containerStyle={{flex: 1, width: 300}}
        isLoading={isLoading}>
        {...otherProps}
    />
  )
}

Props

Name	Type	Default	Description
isLoading	bool	required	Shows the Skeleton bones when true
layout	array of objects	[]	A custom layout for the Skeleton bones
duration	number	1200 ms	Duration of one cycle of animation
containerStyle	object	flex: 1	The style applied to the View containing the bones
easing	Easing	bezier(0.5, 0, 0.25, 1)	Easing of the bones animation
animationType	string	"shiver"	The animation to be used for animating the bones (see demos below)
animationDirection	string	"horizontalRight"	Used only for shiver animation, describes the direction and end-point (ex: horizontalRight goes on the x-axis from left to right)
boneColor	string	"#E1E9EE"	Color of the bones
highlightColor	string	"#F2F8FC"	Color of the highlight of the bones

Note: The Easing type function is the one provided by react-native-reanimated, so if you want to change the default you will have to install it as a dependency.

Examples

See the playground section to experiment : 1 - Changing the direction of the animation (animationDirection prop) :

export default function Placeholder () {
  return (
    <SkeletonContent
        containerStyle={{flex: 1, width: 300}}
        animationDirection="horizontalLeft"
        isLoading={true}>
        ...
    />
  )
}

2 - Changing the colors and switching to "pulse" animation (boneColor, highlightColor and animationType prop) :

export default function Placeholder () {
  return (
    <SkeletonContent
        containerStyle={{flex: 1, width: 300}}
        boneColor="#121212"
        highlightColor="#333333"
        animationType="pulse"
        isLoading={true}>
        ...
    />
  )
}

3 - Customizing the layout of the bones (layout prop) :

export default function Placeholder () {
  return (
    <SkeletonContent
        containerStyle={{flex: 1, width: 300}}
        animationDirection="horizontalLeft"
        layout={[
        // long line
        { width: 220, height: 20, marginBottom: 6 },
        // short line
        { width: 180, height: 20, marginBottom: 6 },
        ...
        ]}
        isLoading={true}>
        ...
    />
  )
}

Playground

You can test out the features and different props easily on Snack. Don't hesitate to take contact if anything is unclear !