import ViewControl from 'react-native-zoom-view'
const {width,height} = Dimensions.get('window')

<ViewControl
    cropWidth={width}     
    cropHeight={height}
    imageWidth={width}
    imageHeight={height}>
    <Image
	style={{
	    width:width,
	    height:height,
	    resizeMode: 'contain'
	}}
	source={{
	    uri:item
	}}/>
</ViewControl>

实现缩放和左右滑
import Swiper from 'react-native-swiper'
import ViewControl from 'react-native-zoom-view'

renderSwiperItemView() {
const imgs = [
    'http://img1.ph.126.net/u1dVCkMgF8qSqqQLXlBFQg==/6631395420169075600.jpg',
    'http://img2.ph.126.net/PqPdn4nhTSXTlPfDE_igJg==/6631322852401020356.jpg',
    'http://img1.ph.126.net/Ta6-WaHwuYMSehnn6Xcmyg==/6631426206490316698.jpg',
    'http://img0.ph.126.net/bCkBoPHS4d32mUJPqBIYrQ==/6631803338979839988.jpg',
    'http://img2.ph.126.net/bkaOfRyDoyddXri0GjpWjA==/6630608169839463386.jpg',
];
return imgs.map((item,i)=>{
    return (
	<ViewControl
	    key={i}
	    cropWidth={width}
	    cropHeight={height}
	    imageWidth={width}
	    imageHeight={height}>
	    <Image
		style={{
		    width:width,
		    height:height,
		    resizeMode: 'contain'
		}}
		source={{
		    uri:item
		}}/>
	</ViewControl>
    )
})
}

render() {
return (
    <Swiper
	loop={false}
	showsPagination={false}>
	{this.renderSwiperItemView()}
    </Swiper>
);
}