New warnings on Swift 4 code from Sololearn curse with iOS 12.0

Question

Taken from Sololearn course of Swift 4 fundamentals, are these 2 lines of code:

let isSaved = NSKeyedArchiver.archiveRootObject(items, toFile: Item.ArchiveURL.path)

return NSKeyedUnarchiver.unarchiveObject(withFile: Item.ArchiveURL.path!) as? [Item]

It works fine now, but Xcode issues warnings on these lines:

'archiveRootObject(_:toFile:)' was deprecated in iOS 12.0: Use +archivedDataWithRootObject:requiringSecureCoding:error: instead

And

'unarchiveObject(withFile:)' was deprecated in iOS 12.0: Use +unarchivedObjectOfClass:fromData:error: instead

The full aspect of the code is:

class Item: NSObject, NSCoding {
func encode(with aCoder: NSCoder) {
aCoder.encode(name, forKey: "name")
}
required convenience init?(coder aDecoder: NSCoder) {
let name = aDecoder.decodeObject(forKey: "name") as! String
self.init(name: name)
}
init?(name: String) {
self.name = name
super.init()
}
}

static let Dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
static let ArchiveURL = Dir.appendingPathComponent("items")

func saveItems() {
let isSaved = NSKeyedArchiver.archiveRootObject(items, toFile: Item.ArchiveURL.path)
if !isSaved {
print("Failed to save items...")
}
}
func loadItems() -> [Item]? {
return NSKeyedUnarchiver.unarchiveObject(
withFile: Item.ArchiveURL.path!) as? [Item]
}

Anyone has any idea on how to implement the fixes of those warnings, so the code will continue to work on future versions?

TIA

Answer 1

Please refer for iOS 12 change in this link https://www.hackingwithswift.com/example-code/system/how-to-save-and-load-objects-with-nskeyedarchiver-and-nskeyedunarchiver

Answer 2

I’m sorry, but I can’t find an answer to the question there...