Adding item to keychain using Swift

Question

I\'m trying to add an item to the iOS keychain using Swift but can\'t figure out how to type cast properly. From WWDC 2013 session 709, given the following Objective-C code:

Answer 1

Swift 3

let kSecClassKey = String(kSecClass)
let kSecAttrAccountKey = String(kSecAttrAccount)
let kSecValueDataKey = String(kSecValueData)
let kSecClassGenericPasswordKey = String(kSecClassGenericPassword)
let kSecAttrServiceKey = String(kSecAttrService)
let kSecMatchLimitKey = String(kSecMatchLimit)
let kSecReturnDataKey = String(kSecReturnData)
let kSecMatchLimitOneKey = String(kSecMatchLimitOne)

you can also do it inside the dictionary itself alá:

var query: [String: Any] = [
    String(kSecClass): kSecClassGenericPassword,
    String(kSecAttrService): "MyService",
    String(kSecAttrAccount): "Some account",
    String(kSecValueData): secret
]

however, this is more expensive for the compiler, even more so since you're probably using the query in multiple places.