Rotate image and save in React-Native - ios

Question

I am going to rotate the image in react–native and I would like to get base64 of rotated image.
I used several libraries
react-native-image-rotate: It's working well on Android but on iOS I get rct-image-store://1 as url so I tried getting base64 using rn-fetch-blob but it throws error that can't recognize that url.
react-native-image-resizer: I used this but the response is not good in iOS. If I set -90 then rotate -180, if I set -180 then it's rotating as -270.
Please help me on this problem, how can I rotate the image in iOS.
I need to rotate the image as -90, -180, -270, -360(original).

Answer 1

Finally, I found answer.
import ImageRotate from 'react-native-image-rotate';
import ImageResizer from 'react-native-image-resizer';
import RNFetchBlob from 'rn-fetch-blob';
ImageRotate.rotateImage(
this.state.image.uri,
rotateDegree,
uri => {
if (Platform.OS === 'android') {
console.log('rotate', uri);
RNFetchBlob.fs.readFile(uri, 'base64').then(data => {
const object = {};
object.base64 = data;
object.width = this.state.image.height;
object.height = this.state.image.width;
object.uri = uri;
this.setState({image: object, spinner: false});
});
} else {
console.log(uri);
const outputPath = `${RNFetchBlob.fs.dirs.DocumentDir}`;
ImageResizer.createResizedImage(
uri,
this.state.image.height,
this.state.image.width,
'JPEG',
100,
0,
outputPath,
).then(response => {
console.log(response.uri, response.size);
let imageUri = response.uri;
if (Platform.OS === 'ios') {
imageUri = imageUri.split('file://')[1];
}
RNFetchBlob.fs.readFile(imageUri, 'base64').then(resData => {
const object = {};
object.base64 = resData;
object.width = this.state.image.height;
object.height = this.state.image.width;
object.uri = response.uri;
this.setState({image: object, spinner: false});
});
});
}
},
error => {
console.error(error);
},
);
}

Answer 2

This is my work well code up to now
rotateImage = (angle) => {
const { currentImage } = this.state; // origin Image, you can pass it from params,... as you wish
ImageRotate.rotateImage( // using 'react-native-image-rotate'
currentImage.uri,
angle,
(rotatedUri) => {
if (Platform.OS === 'ios') {
ImageStore.getBase64ForTag( // import from react-native
rotatedUri,
(base64Image) => {
const imagePath = `${RNFS.DocumentDirectoryPath}/${new Date().getTime()}.jpg`;
RNFS.writeFile(imagePath, `${base64Image}`, 'base64') // using 'react-native-fs'
.then(() => {
// now your file path is imagePath (which is a real path)
if (success) {
this.updateCurrentImage(imagePath, currentImage.height, currentImage.width);
ImageStore.removeImageForTag(rotatedUri);
}
})
.catch(() => {});
},
() => {},
);
} else {
this.updateCurrentImage(rotatedUri, currentImage.height, currentImage.width);
}
},
(error) => {
console.error(error);
},
);
};
I think you have done rotatedUri.
Then you can get base64 by ImageStore from react-native.
Then write it to the local image with react-native-fs
After that you have imagePath is the local image.

Answer 3

Try to use Expo Image Manipulator
https://docs.expo.io/versions/latest/sdk/imagemanipulator/
const rotated = await ImageManipulator.manipulateAsync(
image.uri,
[{ rotate: -90 }],
{ base64: true }
);