AlamofireImage download into CoreData - ios

Question

i want to cache image and few data from json to make persistent I know Alamofire Image has it own chade method, but i guess is only while app is alive when app close and open again chache is cleared so i have to download again image. so
if my image are download like so
image.af_setImage(withURL: url)
it posible to save
imageEntity.save(image.image)
not sure to be exactly code but the idea is to save the image downloaded an set to image in CoreData.
and any idea behind the logic of this approach to cjeck if image exist in coreData and show from the if not download and save to coreData

Answer 1

CoreData is not designed to store ImageData or large data (files) but only String, Dates, integer... Just like a normal database.
If you want to save a data you could use AlamofireImageCache and save the image identifier in the CoreData Entity as a string. It's the most easy way to do it.
let imageCache = AutoPurgingImageCache(
memoryCapacity: 100_000_000,
preferredMemoryUsageAfterPurge: 60_000_000
)
imageCache.add(yourImage, withIdentifier: "YourImageIdentifier")
imageEntity.identifier = "YourImageIdentifier"
Then if you want to get your image you can do for example:
let cachedAvatar = imageCache.image(withIdentifier: imageEntity.identifier)
please check AlamofireImage documentation for more information about cache: https://github.com/Alamofire/AlamofireImage
Update
If you want to make your own ImageCache on the hard-drive here you have an example of storing an Image:
func saveImage(image:UIImage){
if let data = UIImagePNGRepresentation(image) {
let documentPath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]!
let filename = documentPath.appendingPathComponent("YourImageName")
try? data.write(to: filename)
}
}
func getImage(ForName name:String) -> UIImage?{
let documentPath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]!
let filename = documentPath.appendingPathComponent("YourImageName")
return UIImage(contentsOf:URL(fileURLWithPath: filename))
}
Hope it helps !
Pierre