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Last active October 29, 2020 04:54
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[] NSSecureCoding + CoreData
class MyTestClass: NSSecureCoding {
var name: String = ""
var last_name: String = ""
// Make sure you add this property
static var supportsSecureCoding: Bool = true
required init?(coder: NSCoder) {
// NSCoding
//name = coder.decodeObject(forKey: "name") as? String ?? ""
//last_name = coder.decodeObject(forKey: "last_name") as? String ?? ""
// NSSecureCoding
name = coder.decodeObject(of: NSString.self, forKey: "name") as String? ?? ""
last_name = coder.decodeObject(of: NSString.self, forKey: "last_name") as String? ?? ""
func encode(with coder: NSCoder) {
coder.encode(name, forKey: "name")
coder.encode(last_name, forKey: "last_name")
// It has to be a subclass of `NSSecureUnarchiveFromDataTransformer` and we need to expose it to ObjC.
final class MyTestClassValueTransformer: NSSecureUnarchiveFromDataTransformer {
// The name of the transformer. This is what we will use to register the transformer `ValueTransformer.setValueTrandformer(_"forName:)`.
static let name = NSValueTransformerName(rawValue: String(describing: MyTestClassValueTransformer.self))
// Our class `Test` should in the allowed class list. (This is what the unarchiver uses to check for the right class)
override static var allowedTopLevelClasses: [AnyClass] {
return [MyTestClass.self]
/// Registers the transformer.
public static func register() {
let transformer = MyTestClassValueTransformer()
ValueTransformer.setValueTransformer(transformer, forName: name)
// ... Make sure to register before initializing your persistent container
// Register the transformer
// .. Continue initializing Persistent Container
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