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Use the Keychain to determine if the device has a passcode set.
@available(iOS 8.0, *)
public func devicePasscodeEnabledUsingKeychain() -> Bool {
let query: [String:Any] = [
kSecClass as String : kSecClassGenericPassword,
kSecAttrAccount as String : UUID().uuidString,
kSecAttrAccessible as String: kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly,
kSecValueData as String: "HelloWorld".data(using: String.Encoding.utf8)!,
kSecReturnAttributes as String : kCFBooleanTrue
]
var dataTypeRef: AnyObject?
var status = withUnsafeMutablePointer(to: &dataTypeRef) { SecItemCopyMatching(query as CFDictionary, UnsafeMutablePointer($0)) }
if status == errSecItemNotFound {
let createStatus = SecItemAdd(query as CFDictionary, nil)
guard createStatus == errSecSuccess else { return false }
status = withUnsafeMutablePointer(to: &dataTypeRef) { SecItemCopyMatching(query as CFDictionary, UnsafeMutablePointer($0)) }
}
guard status == errSecSuccess else { return false }
return true
}
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