React Native Gallery Swiper

An easy and simple to use React Native component to render a high performant and easily customizable image gallery with common gestures like pan, pinch and double tap. Supporting both iOS and Android.

Learn more about the installation and how to use this package in the updated documentation page.

• Supports smart rendering for large lists or small.
• Scroll loading and supporting onEndReached.
• Includes guestures and important event listeners for pan, pinch, single tap and double tap.
• Includes zoom mode.
• Easily customizable.
• Intelligent scrolling detection to cushion rough swipe guestures.
• Supports both iOS and Android.

Built and similar to react-native-gallery.

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:open_file_folder: Index

1. Install

2. Usage Example

3. Performance Optimization List Example

4. API

5. :books: Props

6. :books: Methods

7. Example Project

9. License

---

:gem: Install

Type in the following to the command line to install the dependency.

1$ npm install --save react-native-gallery-swiper

or

1$ yarn add react-native-gallery-swiper

---

:tada: Usage Example

Add an import to the top of the file. At minimal, declare the GallerySwiper component in the render() method providing an array of data for the images prop.

:information_source: Local images must have a defined dimensions field with width and height or just height and width.

1import GallerySwiper from "react-native-gallery-swiper";
2
3//...
4render() {
5    return (
6        <GallerySwiper
7            images={[
8                // Version *1.1.0 update (or greater versions): 
9                // Can be used with different image object fieldnames.
10                // Ex. source, source.uri, uri, URI, url, URL
11                { uri: "https://luehangs.site/pic-chat-app-images/beautiful-blond-blonde-hair-478544.jpg" },
12                { source: require("yourApp/image.png"),
13                    // IMPORTANT: It is REQUIRED for LOCAL IMAGES
14                    // to include a dimensions field with the
15                    // actual width and height of the image or
16                    // it will throw an error.
17                    dimensions: { width: 1080, height: 1920 } },
18                { source: require("yourApp/image.png"),
19                    // Version *1.5.0 update (or greater versions):
20                    // An alternative to the dimensions field.
21                    // This will also be acceptable.
22                    width: 1080,
23                    height: 1920 },
24                { source: { uri: "https://luehangs.site/pic-chat-app-images/beautiful-beautiful-women-beauty-40901.jpg" } },
25                { uri: "https://luehangs.site/pic-chat-app-images/animals-avian-beach-760984.jpg" },
26                { URI: "https://luehangs.site/pic-chat-app-images/beautiful-blond-fishnet-stockings-48134.jpg" },
27                { url: "https://luehangs.site/pic-chat-app-images/beautiful-beautiful-woman-beauty-9763.jpg" },
28                { URL: "https://luehangs.site/pic-chat-app-images/attractive-balance-beautiful-186263.jpg" },
29            ]}
30            // Version *1.15.0 update
31            // onEndReached={() => {
32            //     // add more images when scroll reaches end
33            // }}
34        />
35    );
36}
37//...

---

:watch: Performance Optimization List Example

1import GallerySwiper from "react-native-gallery-swiper";
2
3//...
4render() {
5    return (
6        <GallerySwiper
7            images={[
8                { uri: "https://luehangs.site/pic-chat-app-images/beautiful-blond-blonde-hair-478544.jpg",
9                    // Optional: Adding a dimensions or height and
10                    // width field with the actual width and height
11                    // for REMOTE IMAGES will help improve performance.
12                    dimensions: { width: 1080, height: 1920 } },
13                { uri: "https://luehangs.site/pic-chat-app-images/beautiful-beautiful-women-beauty-40901.jpg",
14                    dimensions: { width: 1080, height: 1920 } },
15                { uri: "https://luehangs.site/pic-chat-app-images/animals-avian-beach-760984.jpg",
16                    dimensions: { width: 1080, height: 1920 } },
17                { uri: "https://luehangs.site/pic-chat-app-images/beautiful-blond-fishnet-stockings-48134.jpg",
18                    dimensions: { width: 1080, height: 1920 } },
19                { uri: "https://luehangs.site/pic-chat-app-images/beautiful-beautiful-woman-beauty-9763.jpg",
20                    dimensions: { width: 1080, height: 1920 } },
21                { uri: "https://luehangs.site/pic-chat-app-images/attractive-balance-beautiful-186263.jpg",
22                    dimensions: { width: 1920, height: 1080 } },
23                // ...
24                // ...
25                // ...
26            ]}
27            // Version *1.15.0 update
28            // onEndReached={() => {
29            //     // add more images when scroll reaches end
30            // }}
31            // Change this to render how many items before it.
32            initialNumToRender={2}
33            // Turning this off will make it feel faster
34            // and prevent the scroller to slow down
35            // on fast swipes.
36            sensitiveScroll={false}
37        />
38    );
39}
40//...

---

:nut_and_bolt: API

<GallerySwiper /> component accepts the following props...

:books: Props

Props	Description	Type	Default
images	An array of objects. source, source.uri, uri, URI, url or URL is a required field (if multiple similar fields in an image object, priority will go from start source to last URL). EX. [{ source: require("yourApp/image.png"), dimensions: { width: 1080, height: 1920 } }, { uri: "https://luehangs.site/pic-chat-app-images/animals-avian-beach-760984.jpg", dimensions: { width: 1080, height: 1920 } }, { uri: "https://luehangs.site/pic-chat-app-images/beautiful-blond-blonde-hair-478544.jpg"}]	Array	Required
style	Styling the gallery.	object, Array	{flex: 1, backgroundColor: "#000"}
initialPage	Index of image to be displayed first.	number	0
resizeMode	The mechanism that should be used to resize the image when the image's dimensions differ from the image view's dimensions. Expecting one of "contain", "cover", "stretch", "repeat", "center". Version *1.12.0 update.	string	"contain"
imageComponent	Custom function to render your images. (imageProps: { imageLoaded: boolean, source: object, image: object, style: Array<object>, resizeMode: string, capInsets: object, onLoadStart: Function, onLoad: Function, ...extras }, imageDimensions: {width: number, height: number}, index: number) => React.Element index params included in Version *1.3.1 update	Function	<Image/> component
errorComponent	Custom function to render the page of an image that couldn't be displayed.	Function	A <View/> with a stylized error
initialNumToRender	How many items to render in the initial batch. Version *1.3.0 update.	number	7
flatListProps	Props to be passed to the underlying FlatList.	object	{windowSize: 3}
pageMargin	Blank margin space to show between images.	number	0
sensitiveScroll	Detect rough and fast swiping gestures in order to "cushion" or slow down a swipe at the end. Version *1.4.0 update.	boolean	true
onPageSelected	Executed with the index of page that has been selected. (index: number) => void	Function
onPageScrollStateChanged	Called when page scrolling state has changed, see scroll state and events. (state: string) => void	Function
onPageScroll	Scroll event, see scroll state and events. (event: { position: number, offset: number, fraction: number }) => void	Function
scrollViewStyle	Custom style for the FlatList component.	object	{}
onDoubleTapConfirmed	Executed after a double tap. (index: number) => void Version *1.8.0 update	Function
onSingleTapConfirmed	Executed after a single tap. (index: number) => void	Function
onLongPress	Executed after a long press. (gestureState: object, index: number) => void index params in Version *1.10.0 update.	Function
onViewTransformed	Executed while being transformed in anyway (view transformer). (transform: { scale: number, translateX: number, translateY: number }, index: number) => void Version *1.16.0 update.	Function
onPinchTransforming	Executed while pinching to transform view or zoom (view transformer). (transform: { scale: number, translateX: number, translateY: number }, index: number) => void Version *1.17.0 update.	Function
onPinchStartReached	Executed after scaling out or zooming out to initial size using the pinch gesture. (transform: { scale: number, translateX: number, translateY: number }, index: number) => void Version *1.18.0 update.	Function
onPinchEndReached	Executed after scaling in or zooming in to maxScale threshold using the pinch gesture. (transform: { scale: number, translateX: number, translateY: number }, index: number) => void Version *1.18.0 update.	Function
onTransformGestureReleased	Executed after a transform guesture released (view transformer). (transform: { scale: number, translateX: number, translateY: number }, index: number) => void Version *1.16.0 update.	Function
onSwipeUpReleased	Executed after releasing an upward swipe at a specific y translate threshold while not in zoom mode. (transform: { scale: number, translateX: number, translateY: number }, index: number) => void For custom precision swiping gestures, refer to the onTransformGestureReleased. Version *1.25.0 update.	Function
onSwipeDownReleased	Executed after releasing a downward swipe at a specific y translate threshold while not in zoom mode. (transform: { scale: number, translateX: number, translateY: number }, index: number) => void For custom precision swiping gestures, refer to the onTransformGestureReleased. Version *1.25.0 update.	Function
onDoubleTapStartReached	Executed after scaling out or zooming out using double tap. (transform: { scale: number, translateX: number, translateY: number }, index: number) => void Version *1.17.0 update.	Function
onDoubleTapEndReached	Executed after scaling in or zooming in using double tap. (transform: { scale: number, translateX: number, translateY: number }, index: number) => void Version *1.17.0 update.	Function
onEndReached	Called once when the page index gets within the onEndReachedThreshold of the images content. () => void Version *1.15.0 update.	Function
onEndReachedThreshold	How far from the end (in units of visible length of the list) of the list of images must be from the end of the content to trigger the onEndReached callback. Thus a value of 0.5 will trigger onEndReached when the end of the content is within half the visible length of the images. Version *1.15.0 update.	number	0.5
enableScale	Enable or disable zoom and double tap zoom (view transformer). Version *1.9.0 update.	boolean	true
maxScale	Max zoom (view transformer). Number greater than 1 will create a zoom. Default will only zoom for large images as tiny images will be pixelated if scaling occurs. Version *1.17.0 update.	number	Math.max(imageWidth / viewWidth, imageHeight / viewHeight)
enableTranslate	Enable or disable moving while in zoom (view transformer). Version *1.11.0 update.	boolean	true
enableResistance	Enable or disable resistance over panning (view transformer). Version *1.14.0 update.	boolean	true
resistantStrHorizontal	Resistant value for left and right panning (view transformer). (dx: number) => number Version *1.14.0 update.	Function, number or string	(dx) => (dx /= 3)
resistantStrVertical	Resistant value for top and bottom panning (view transformer). (dy: number) => number Version *1.14.0 update.	Function, number or string	(dy) => (dy /= 3)
maxOverScrollDistance	A number used to determine final scroll position triggered by fling (view transformer). Version *1.16.0 update.	number	20
removeClippedSubviews	To improve scroll performance for large lists. Version *1.4.1 update.	boolean	true
refPage	The ref for the inner View page. Version *1.2.0 update.	Function

---

:books: Methods

:small_blue_diamond: flingToPage(params)

Scrolls to the following index with input velocity.

Parameters:

Name	Type	Required	Description
params	object	YES	See below.

Valid params keys are:

• "index" (number) - Index of desired page. Required.
• "velocityX" (boolean) - Speed intensity > 0.00. Required.

:small_blue_diamond: scrollToPage(params)

Scrolls to the following index with or without animation.

Parameters:

Name	Type	Required	Description
params	object	YES	See below.

Valid params keys are:

• "index" (number) - Index of desired page. Required.
• "immediate" (boolean) - Animated transition or not. Defaults to false.

---

:clapper: Example Project

Perform steps 1-2 to run locally:

1. Clone the Repo
2. Install and Run

:small_blue_diamond: 1. Clone the Repo

Clone react-native-gallery-swiper locally. In a terminal, run:

1$ git clone https://github.com/Luehang/react-native-gallery-swiper.git react-native-gallery-swiper

:small_blue_diamond: 2. Install and Run

1$ cd react-native-gallery-swiper/example/

iOS - Mac - Install & Run

1. check out the code
2. npm install
3. npm run ios

Android - Mac - Install & Run

1. check out the code
2. npm install
3. emulator running in separate terminal
4. npm run android

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:page_facing_up: License

ISC, as found in the LICENSE file.