react-native-snap-carousel

Swiper component for React Native featuring previews, multiple layouts, parallax images, performant handling of huge numbers of items, and RTL support. Compatible with Android & iOS.

:raised_hands: New feature: layouts

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Table of contents

1. Showcase
2. Usage
3. Example
4. Props, methods and getters
5. Layouts and custom interpolations
6. ParallaxImage component
7. Pagination component
8. Tips and tricks
9. Known issues
10. Important note regarding Android
11. Important note regarding iOS
12. Roadmap
13. Credits

Showcase

Archriss' "Ville d'Aix-en-Provence" app

This app is available on Android and iOS. It uses version 3.2.0 of the plugin, with FlatList's implementation and parallax images.

Archriss' showcase app

You can try the app live on Android and iOS. It currently uses version 1.4.0 of the plugin. Be aware that sliders' layouts will break on RTL devices since support was added in version 2.1.0 (see #38).

Please note that we do not plan on Open-Sourcing the code of our showcase app. Still, we've put together an example for you to play with, and you can find some insight about our map implementation in this comment. The folks at codedaily.io have created a great tutorial about implementing a similar feature. Go check it out!

Usage

$ npm install --save react-native-snap-carousel

import Carousel from 'react-native-snap-carousel';

export class MyCarousel extends Component {

    _renderItem ({item, index}) {
        return (
            <View style={styles.slide}>
                <Text style={styles.title}>{ item.title }</Text>
            </View>
        );
    }

    render () {
        return (
            <Carousel
              ref={(c) => { this._carousel = c; }}
              data={this.state.entries}
              renderItem={this._renderItem}
              sliderWidth={sliderWidth}
              itemWidth={itemWidth}
            />
        );
    }
}

Example

You can find the following example in the /example folder.

Props, methods and getters

In order to let you to create mighty carousels and to keep up with your requests, we add new features on a regular basis. Consequently, the list of available props has become really huge and deserves a documentation of its own.

:books: Documentation for "Props, methods and getters"

Layouts and custom interpolations

Built-in layouts

In version 3.6.0, we've added two new layouts on top of the original one: the first one is called 'stack' since it mimics a stack of cards, and the other one is called 'tinder' since it provides a Tinder-like animation.

You can choose between the three of them using the new prop layout and you can modify the default card offset in the 'stack' and 'tinder' layouts with prop layoutCardOffset.

<Carousel layout={'default'} />

<Carousel layout={'stack'} layoutCardOffset={`18`} />

<Carousel layout={'tinder'} layoutCardOffset={`9`} />

A few things worth noting:

• As you can see, the effect had to be inverted on Android. This has to do with a really annoying Android-specific bug.
• Even though the new layouts have been created with horizontal carousels in mind, they will also work with vertical ones \o/
• :warning: You should NOT use stack or tinder layouts if you have a large data set to display. In order to avoid rendering issues, the carousel will use a ScrollView component rather than a FlatList one for those layouts (see prop useScrollView). The tradeof is that you won't benefit from any of FlatList's advanced optimizations. See this issue for workarounds; or you may want to implement your own custom interpolation.

Custom interpolations

On top of the new layouts, we've exposed the logic we used so that users can create their own awesome layouts! If you're interested, take a deep breath and dive into the dedicated documentation.

:books: Documentation for "Custom interpolations"

Here are a few examples of what can easily be achieved (you can explore the source code and try it live in the provided example):

ParallaxImage component

Version 3.0.0 introduced a <ParallaxImage /> component, an image component aware of carousel's current scroll position and therefore able to display a nice parallax effect (powered by the native driver to ensure top-notch performance).

:books: Documentation for "ParallaxImage component"

Pagination component

Starting with version 2.4.0, a customizable <Pagination /> component has been added. You can see below how it looks like with its default configuration.

:books: Documentation for "Pagination component"

Tips and tricks

We've gathered together all the useful tips and tricks. There is a bunch of them, which makes this section a must-read!

:books: Documentation for "Tips and tricks"

Known issues

Make sure to read about the known issues before opening a new one; you may find something useful.

:books: Documentation for "Known issues"

Important note regarding Android

Android's debug mode is a mess: timeouts regularly desynchronize and scroll events are fired with some lag, which completely alters the inner logic of the carousel. On Android, you will experience issues with carousel's behavior when JS Dev Mode is enabled, and you might have trouble with unreliable callbacks and loop mode when it isn't. This is unfortunate, but it's rooted in various flaws of ScrollView/FlatList's implementation and the miscellaneous workarounds we had to implement to compensate for it.

:warning: Therefore you should always check if the issue you experience also happens in a production environment. This is, sadly, the only way to test the real performance and behavior of the carousel.

For more information, you can read the following notes: "Android performance" and "Unreliable callbacks".

Important note regarding iOS

:warning: When debugging with the iOS simulator, you're only one "Cmd + T" away from toggling "Slow Animations". If carousel's animations seem painfully slow, make sure that you haven't enabled this setting by mistake.

Roadmap

• [ ] Add more examples
• [ ] Base the plugin on a component less buggy than FlatList
• [X] Implement different layouts and allow using custom interpolations
• [X] Implement both FlatList and ScrollView handling
• [X] Add the ability to provide custom items animation
• [X] Implement 'loop' mode
• [X] Improve Android's behavior
• [x] Add parallax image component
• [x] Base the plugin on FlatList instead of ScrollView
• [x] Add alignment option
• [x] Add pagination component
• [x] Add vertical implementation
• [x] Handle device orientation event (see this note)
• [x] Add RTL support
• [x] Improve momemtum handling
• [x] Improve snap on Android
• [x] Handle passing 1 item only
• [x] Fix centering

Credits

Written by Benoît Delmaire (bd-arc) and Maxime Bertonnier (Exilz) at Archriss.