Swift Recursively Encode a Custom Class Data Structure - swift

Question

I want to save a queue in UserDefault. When I decode the Queue from UserDefault, head and tail of the Queue are assigned by value which means they are two completely different objects and I can't enqueue through the tail. Is it possible to encode tail as a reference to head?
This is how class Queue is implemented
#State var RecentEmoji = Queue()
public class Node: Codable {
var value: Int
var next: Node?
init(value: Int) {
self.value = value
self.next = nil
}
enum CodingKeys: CodingKey {
case value, next
}
public func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(value, forKey: .value)
try container.encode(next, forKey: .next)
}
public required init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
value = try container.decode(Int.self, forKey: .value)
next = try container.decode(Node?.self, forKey: .next)
}
}
public class Queue: Sequence, Codable {
fileprivate var head: Node?
private var tail: Node?
private var length: Int
init() {
head = nil
tail = nil
length = 0
}
enum CodingKeys: CodingKey {
case head, tail, length
}
public func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(head, forKey: .head)
try container.encode(tail, forKey: .tail)
try container.encode(length, forKey: .length)
}
public required init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
head = try container.decode(Node?.self, forKey: .head)
tail = try container.decode(Node?.self, forKey: .tail)
length = try container.decode(Int.self, forKey: .length)
}
}
This is how I save the Queue to userDefault
let encoder = JSONEncoder()
do {
let encoded = try encoder.encode(RecentEmoji)
let defaults = UserDefaults.standard
defaults.set(encoded, forKey: "RecentEmoji")
} catch {
print("\(error)")
}
And this is how I get them back
if let savedEmoji = UserDefaults.standard.value(forKey: "RecentEmoji") as? Data {
let decoder = JSONDecoder()
if let recentEmoji = try? decoder.decode(Queue.self, from: savedEmoji) {
RecentEmoji = recentEmoji
}
}