save/load [key: value] to/from iOS keychain

KeychainAccessor.swift

save(key: "TestKey", value: "TestValue")
print(getAllKeyChainItems())

func save(key: String, value: String) -> Bool {
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrAccount as String: key,
        kSecValueData as String: value.data(using: String.Encoding.utf8, allowLossyConversion: true)!
    ]
    SecItemDelete(query as CFDictionary)
    let status: OSStatus = SecItemAdd(query as CFDictionary, nil)
    return status == noErr
}

func getAllKeyChainItems() -> [String: String] {
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecReturnData as String: kCFBooleanTrue,
        kSecReturnAttributes as String: kCFBooleanTrue,
        kSecReturnRef as String: kCFBooleanTrue,
        kSecMatchLimit as String: kSecMatchLimitAll
    ]
    var result: AnyObject?
    let lastResultCode = withUnsafeMutablePointer(to: &result) {
        SecItemCopyMatching(query as CFDictionary, UnsafeMutablePointer($0))
    }
    var values = [String: String]()
    if lastResultCode == noErr {
        let array = result as? [[String: Any]]
        for item in array! {
            if let key = item[kSecAttrAccount as String] as? String,
                let value = item[kSecValueData as String] as? Data {
                values[key] = String(data: value, encoding: .utf8)
            }
        }
    }
    return values
}