My app reports a lot of crashes from 18.2 users.
I have been able to narrow down the issue to this line of code:
CGImageDestinationFinalize(imageDestination)
The error is Thread 93: EXC_BAD_ACCESS (code=1, address=0x146318000)
But I have no idea why this suddently started to crash.
Here is the code of the function:
private func estimateSizeUsingThumbnailMethod(fromImageURL url: URL, imageSettings: ImageSettings) -> (Int, Int) {
let sourceOptions = [kCGImageSourceShouldCache: false] as CFDictionary
guard let source = CGImageSourceCreateWithURL(url as CFURL, sourceOptions),
let imageProperties = CGImageSourceCopyPropertiesAtIndex(source, 0, nil) as? [CFString: Any],
let imageWidth = imageProperties[kCGImagePropertyPixelWidth] as? CGFloat,
let imageHeight = imageProperties[kCGImagePropertyPixelHeight] as? CGFloat else {
return (0, 0)
}
let maxImageSize = max(imageWidth, imageHeight)
let thumbMaxSize = min(2400, maxImageSize) // Use original size if possible, but not if larger than 2400, in this case we'll extrapolate from thumbnail
let downsampleOptions = [
kCGImageSourceCreateThumbnailFromImageAlways: true,
kCGImageSourceCreateThumbnailWithTransform: true,
kCGImageSourceThumbnailMaxPixelSize: thumbMaxSize as CFNumber,
] as CFDictionary
guard let cgImage = CGImageSourceCreateThumbnailAtIndex(source, 0, downsampleOptions) else {
DLog("CGImage thumb creation error")
return (0, 0)
}
let data = NSMutableData()
guard let imageDestination = CGImageDestinationCreateWithData(data, UTType.jpeg.identifier as CFString, 1, nil) else {
DLog("CGImage destination creation error")
return (0, 0)
}
let destinationProperties = [
kCGImageDestinationLossyCompressionQuality: imageSettings.quality.compressionRatio() // Set jpeg compression ratio
] as CFDictionary
CGImageDestinationAddImage(imageDestination, cgImage, destinationProperties)
CGImageDestinationFinalize(imageDestination) // <----- CRASHES HERE with EXC_BAD_ACCESS
...
}
So far, I'm stuck. Any idea that could help would be greatly appreciated, as I'm scared that this crash will propagate on the official release of 18.2
