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import Foundation | |
extension UserDefaults { | |
struct Key<Value> { | |
let name: String | |
init(_ name: String) { | |
self.name = name | |
} | |
} | |
subscript<V: Codable>(key: Key<V>) -> V? { | |
get { | |
guard let data = self.data(forKey: key.name) else { | |
return nil | |
} | |
return try? JSONDecoder().decode(V.self, from: data) | |
} | |
set { | |
guard let value = newValue, let data = try? JSONEncoder().encode(value) else { | |
self.set(nil, forKey: key.name) | |
return | |
} | |
self.set(data, forKey: key.name) | |
} | |
} | |
subscript(key: Key<URL>) -> URL? { | |
get { return self.url(forKey: key.name) } | |
set { self.set(newValue, forKey: key.name) } | |
} | |
subscript(key: Key<String>) -> String? { | |
get { return self.string(forKey: key.name) } | |
set { self.set(newValue, forKey: key.name) } | |
} | |
subscript(key: Key<Data>) -> Data? { | |
get { return self.data(forKey: key.name) } | |
set { self.set(newValue, forKey: key.name) } | |
} | |
subscript(key: Key<Bool>) -> Bool { | |
get { return self.bool(forKey: key.name) } | |
set { self.set(newValue, forKey: key.name) } | |
} | |
subscript(key: Key<Int>) -> Int { | |
get { return self.integer(forKey: key.name) } | |
set { self.set(newValue, forKey: key.name) } | |
} | |
subscript(key: Key<Float>) -> Float { | |
get { return self.float(forKey: key.name) } | |
set { self.set(newValue, forKey: key.name) } | |
} | |
subscript(key: Key<Double>) -> Double { | |
get { return self.double(forKey: key.name) } | |
set { self.set(newValue, forKey: key.name) } | |
} | |
} | |
// ----------------------------------------------------------------------------- | |
// TEST | |
struct Person: Codable { | |
var name: String | |
var age: Int | |
} | |
extension UserDefaults.Key { | |
typealias Key = UserDefaults.Key | |
//static let test = Key<Bool>("aaaa") | |
static var test: Key<Bool> { return Key<Bool>("test") } | |
static var array: Key<[Person]> { return Key<[Person]>("array") } | |
} | |
UserDefaults.standard[.test] = true | |
let test = UserDefaults.standard[.test] | |
print(test) // true | |
UserDefaults.standard[.array] = [ | |
Person(name: "Taro", age: 10), | |
Person(name: "Jiro", age: 8) | |
] | |
let array = UserDefaults.standard[.array] | |
print(array!) // [Person(name: "Taro", age: 10), Person(name: "Jiro", age: 8)] |
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How to delete using same key type?