React Native: print full image in a Scrollview - react-native

Question

I have an image that is very tall, but not very large. I want to print it in a scrollview, so you can see it all on one screen, but nothing works.
after playing with widths and heights and flexs for my scrollview and my image, the best result I get is when I have on of them with style={{width='100%'}}, like that
<ScrollView style={{width: '100%'}}>
<Image
source={require('./assets/skeleton/fullSkeleton.png')}
resizeMode='cover'
/>
</ScrollView>
which prints the image at full width, but the scrollview's height is the original image's height, which doesn't let me see the whole resized image.
Here, a bad drawing to represent my image, and what I want to see on my phone screen
EDIT:
With this bit of code:
<ScrollView
contentContainerStyle={{alignItems: 'center'}}>
<Image
source={require('./fullSkeleton.png')}
resizeMode='cover'
/>
</ScrollView>
I end up with
Which can be scrolled down to see the rest of the Image. As you can see, it can be navigated vertically, but doesn't take the whole screen's width

Answer 1

This kind of thing in Reat Native is actually quite tricky. But you can do it easily; First get picture dimensions:
const FullWidthPicture = ({ uri }) => {
const [ratio, setRatio] = useState(1);
useEffect(() => {
if (uri) {
Image.getSize(uri, (width, height) => {
setRatio(width / height);
});
}
}, [uri]);
return (
<Image
style={{ width: '100%', height: undefined, aspectRatio: ratio }}
resizeMode="contain"
source={{ uri }}
/>
);
};
And use it like this:
<ScrollView style={{flex: 1}}>
<FulWidthImage uri={pictureUri} />
</ScrollView>

Answer 2

The following may help:
You can use contentContainerStyle to style the contents of the ScrollView. Like this (essentially what you have):
<ScrollView
contentContainerStyle={{alignItems: 'center'}}>
<Image
source={require('./fullSkeleton.png')}
resizeMode='cover'
/>
</ScrollView>
That works for me - I can scroll down the whole image and at the bottom it stays visible.
NB: To make the image cover the whole screen while maintaining the height required, you will need to set the width specifically. In my case on iPhone 7+ that meant adding style={{width: 414}} to the Image component AND changing resizeMode to 'stretch'.
Here is the official take on Image resizing...and getting device dimensions will be useful here too.