react-native-pdf-light

react-native-pdf-light

PDF viewer for React Native. Implemented with platform native render functions for smallest deploy size impact, and restricted feature set to simplify integration with larger systems.

Includes prefabricated full document viewer based on FlatList and a single page render component to use as a building block for your own fully custom viewer.

Uses android.graphics.pdf.PdfRenderer on Android and CGPDFDocument on iOS. Unlike many native components in the wild, react-native-pdf-light provides full implementation of React Native shadow nodes. This simplifies UI development, since the component actually knows its own dimensions.

Installation

npm install react-native-pdf-light

If iOS build fails with Undefined symbol: __swift_FORCE_LOAD_..., add an empty .swift file to the xcode project.

Usage

import { Pdf, PdfUtil } from 'react-native-pdf-light';

PdfUtil.getPageCount(source).then(console.log);

<Pdf source={source} />

If creating your own custom viewer, import can be optimized to:

import { PdfView } from 'react-native-pdf-light/PdfView';

<PdfView page={page} source={source} />

<Pdf ... /> Display a pdf.

Props:

• onError: (error: Error) => void
  • Optional: Callback to handle errors.
• onLoadComplete: (numberOfPages: number) => void
  • Optional: Callback to handle pdf load completion.
  • Passed the page count of the loaded pdf.
• onMeasurePages: (measurements: { itemHeight: number, offset: number }[]) => void
  • Optional: Callback to receive layout details of all pages.
• source: string
  • Document to display.

The following props are forwarded to the underlying FlatList component:

• initialScrollIndex
• ListEmptyComponent
• onMomentumScrollBegin
• onMomentumScrollEnd
• onScroll
• onScrollBeginDrag
• onScrollEndDrag
• scrollEventThrottle

Methods:

• scrollToIndex(index: number): void
  • Scroll to the specified page (0-indexed).
• scrollToOffset(offset: number): void
  • Scroll to the specified offset.

<PdfView ... /> Single page of a pdf.

Props:

• page: number
  • Page (0-indexed) of document to display.
• resizeMode: 'contain' | 'fitWidth'
  • Optional: How pdf page should be scaled to fit in view dimensions.
• source: string
  • Document to display.
• style: ViewStyle
  • Optional: View stylesheet.

PdfUtil Utility functions.

PdfUtil.getPageCount(source: string): Promise<number>

• Get the number of pages of a pdf.

PdfUtil.getPageSizes(source: string): Promise<{ height: number; width: number }[]>

• Get the dimensions of every page.

PdfUtil.unpackAsset(source: string): Promise<string>

• Extract a bundled asset and return its absolute path.

Known Issues

On Android API level < 26 when directly rendering pages with PdfView at a non-default aspect ratio (e.g. setting both width and height of the view such that the view's aspect ratio does not match the pdf page's aspect ratio) if a page in the pdf is cropped or rotated, the page may render in the wrong position. This is due to a bug in the native android.graphics.pdf.PdfRenderer. (If you are aware of a fix, pull requests welcome.)

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

MIT