I have a project that currently has data saved locally and I'm trying to get it to sync over multiple devices.
Currently basic data is syncing perfectly fine, but I'm having issues getting the images to convert to data. From what I've researched it because I'm using a UIImage to convert and this caches the image
It works fine when there's only a few images, but if there's several its a pain
The associated code
func updateLocalImages() {
autoreleasepool {
let fetchRequest: NSFetchRequest<Project> = Project.fetchRequest()
fetchRequest.predicate = NSPredicate(format: "converted = %d", false)
fetchRequest.sortDescriptors = [NSSortDescriptor(keyPath: \Project.statusOrder?.sortOrder, ascending: true), NSSortDescriptor(keyPath: \Project.name, ascending: true)]
do {
let projects = try viewContext.fetch(fetchRequest)
for project in projects {
currentPicNumber = 0
currentProjectName = project.name ?? "Error loading project"
if let pictures = project.pictures {
projectPicNumber = pictures.count
for pic in pictures {
currentPicNumber = currentPicNumber + 1
let picture : Picture = pic as! Picture
if let imgData = convertImage(picture: picture) {
picture.pictureData = imgData
}
}
project.converted = true
saveContext()
}
}
} catch {
print("Fetch Failed")
}
}
}
func convertImage(picture : Picture)-> Data? {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
let path = paths[0]
if let picName = picture.pictureName {
let imagePath = path.appendingPathComponent(picName)
if let uiImage = UIImage(contentsOfFile: imagePath.path) {
if let imageData = uiImage.jpegData(compressionQuality: 0.5) {
return imageData
}
}
}
return nil
}```
I can resolve it by refreshing the context after each project save, but not sure if its the best way of doing it.
It's great that the issue has been solved. Just to add a bit from the Core Data perspective to hopefully make things clear: When your app fetches or creates objects in a managed context, Core Data caches the objects to avoid a round trip to the store file when the app uses those objects again, which grows the memory footprint of an app as it processes more and more objects.
You can lower the memory footprint by calling reset().
Note that if your app retains a managed object associated with a context, resetting the context will invalidate the object, and so you will need to validate the object after the reset by refetching the object or calling object(with:)).
Best,
——
Ziqiao Chen
Worldwide Developer Relations.