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The easiest way to store data model to file using `Codable` and `NSKeyedArchiver`.
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| import PlaygroundSupport | |
| import Foundation | |
| func load<T: Decodable>(from file: URL) -> T? { | |
| guard let data = NSKeyedUnarchiver.unarchiveObject(withFile: file.path) as? Data else { return nil } | |
| do { | |
| let products = try PropertyListDecoder().decode(T.self, from: data) | |
| print("Successful load") | |
| return products | |
| } catch let e { | |
| print("Load Failed: \(e)") | |
| return nil | |
| } | |
| } | |
| func store<T: Encodable>(data: T ,to file: URL) { | |
| do { | |
| let data = try PropertyListEncoder().encode(data) | |
| let success = NSKeyedArchiver.archiveRootObject(data, toFile: file.path) | |
| print(success ? "Successful save" : "Save Failed") | |
| } catch let e { | |
| print("Save Failed: \(e)") | |
| } | |
| } | |
| /* | |
| Usage: | |
| 'Adding Codable to the inheritance list for Landmark triggers an automatic conformance that satisfies all of the protocol requirements from Encodable and Decodable' | |
| https://developer.apple.com/documentation/foundation/archives_and_serialization/encoding_and_decoding_custom_types | |
| */ | |
| struct Person: Codable { | |
| var name: String | |
| var age: Int | |
| var addedAt: Date | |
| } | |
| let path = playgroundSharedDataDirectory.appendingPathComponent("foo.plist") | |
| //store or load object | |
| var michael: Person? = Person(name: "Michael", age: 5, addedAt: Date()) | |
| store(data: michael, to: path) | |
| michael = load(from: path) | |
| //also you can store list or any object | |
| let peter = Person(name: "Peter", age: 12, addedAt: Date()) | |
| store(data: [michael, peter], to: path) | |
| let list:[Person?]? = load(from: path) |
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