Support to dynamic children and pageNumber property

In this line https://github.com/leecade/react-native-swiper/blob/master/src%2Findex.js#L187

initState.total = props.children ? props.children.length || 1 : 0

You get the total page Number from children, this is really bad design when you want to have infinite swipes

It should be possible to set a pageNumber property to set the total, and also an option to render dynamic just one view

One use case, swipe pdf pages:

<Swiper
   totalPage={pdf.numberOfPages}
   onChange={(currentPage, nextPage) => this.setState({currentPage: nextPage})>
   <PDFView src={pdf.path} pageNumber={this.state.currentPage} />
</Swiper>

I can help you to merge some pull request :)

Start in src/index.js around line 187, where the page total is derived from props.children, and trace how that value affects swipe rendering and page-change callbacks. Define how totalPage and a single dynamically rendered view should interact, then verify the PDF-page use case and existing swipe behavior remain consistent.