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Using NSUserDefaults in Swift 4.
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import Foundation | |
public let Defaults = UserDefaults.standard | |
open class DefaultsKeys { | |
fileprivate init() {} | |
} | |
open class DefaultsKey<ValueType>: DefaultsKeys { | |
public let _key: String | |
public init(_ key: String) { | |
self._key = key | |
super.init() | |
} | |
} | |
extension UserDefaults { | |
public subscript<T: Codable>(key: DefaultsKey<T>) -> T? { | |
get { | |
guard let data = object(forKey: key._key) as? Data else { return nil } | |
let decoder = JSONDecoder() | |
let dictionary = try! decoder.decode([String: T].self, from: data) | |
return dictionary["top"] | |
} | |
set { | |
guard let value = newValue else { return set(nil, forKey: key._key) } | |
let encoder = JSONEncoder() | |
let data = try! encoder.encode(["top": value]) | |
set(data, forKey: key._key) | |
} | |
} | |
} | |
// Usage | |
extension DefaultsKeys { | |
static let accessToken = DefaultsKey<AccessToken>("access_token") | |
} | |
guard let token = Defaults[.accessToken] else { return } |
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