Problem

I upgraded a React Native mobile app to iOS 17 and encountered a crash while testing in BrowserStack:

Terminating app due to uncaught exception 'NSInternalInconsistencyException'

I checked the logs and found the reason:

UIGraphicsBeginImageContext() failed to allocate CGBitampContext: size={0, 0}, scale=3.000000, bitmapInfo=0x2002. Use UIGraphicsImageRenderer to avoid this assert.

UIGraphicsBeginImageContext() is deprecated in iOS 17 and when the width or height is 0, it throws an exception.

This error appears in:

• react-native-fast-image
• TOCropViewController
• react-native-image-crop-picker

Solution

I did a recursive search for UIGraphicsBeginImageContext in my working directory:

grep -r UIGraphicsBeginImageContext

I located the files from node_modules that used the deprecated function:

./node_modules/react-native-image-crop-picker/ios/QBImagePicker/QBImagePicker/QBAlbumsViewController.m:    UIGraphicsBeginImageContext(size);
./node_modules/react-native-image-crop-picker/ios/src/Compression.m:    UIGraphicsBeginImageContext(newSize);
./node_modules/react-native-image-crop-picker/ios/src/UIImage+Resize.m:   UIGraphicsBeginImageContextWithOptions(dstSize, NO, self.scale);

These were the offending lines of code:

UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *resizedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

I replaced the code block with UIGraphicsImageRenderer:

UIGraphicsImageRenderer *renderer = [[UIGraphicsImageRenderer alloc] initWithSize:newSize];
UIImage *resizedImage = [renderer imageWithActions:^(UIGraphicsImageRendererContext * _Nonnull rendererContext) {
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
}];

I rebuilt the app and was no longer able to reproduce the error.