Created
January 1, 2019 15:07
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Memento Design Pattern
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import UIKit | |
typealias MementoType = [String: Any] | |
protocol Memento: class { | |
var key: String { get set } | |
var state: MementoType { get set } | |
func save() | |
func retrieve() | |
} | |
extension Memento { | |
func save() { | |
UserDefaults.standard.set(state, forKey: key) | |
} | |
func retrieve() { | |
state = (UserDefaults.standard.object(forKey: key) as? MementoType) ?? MementoType() | |
} | |
} | |
class Profile: Memento { | |
var key: String | |
var state: MementoType | |
var name: String | |
var age: Int | |
init(name: String, age: Int, key: String) { | |
self.name = name | |
self.age = age | |
self.key = key | |
self.state = MementoType() | |
} | |
func saveDetails() { | |
state["name"] = name | |
state["age"] = age | |
save() | |
} | |
init(key: String) { | |
self.key = key | |
self.state = MementoType() | |
self.name = "" | |
self.age = 0 | |
} | |
func retrieveDetails() -> MementoType { | |
retrieve() | |
return state | |
} | |
} |
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