For this i use La Authentication framework but with the help of that i don't got fingerprint data and it just returns me boolean value i.e true and false , so it cant help i want fingerprint data in variable so further i will process it.
Help me.
following is the sample code,
func authenticateUser() {
...
// Check if the device can evaluate the policy.
if context.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: &error) {
[context .evaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, localizedReason: reasonString, reply: { (success: Bool, evalPolicyError: NSError?) -> Void in
if success {
}
else {
// If authentication failed then show a message to the console with a short description.
// In case that the error is a user fallback, then show the password alert view.
println(evalPolicyError?.localizedDescription)
switch evalPolicyError!.code {
case LAError.SystemCancel.toRaw():
println("Authentication was cancelled by the system")
case LAError.UserCancel.toRaw():
println("Authentication was cancelled by the user")
case LAError.UserFallback.toRaw():
println("User selected to enter custom password")
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
self.showPasswordAlert()
})
default:
println("Authentication failed")
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
self.showPasswordAlert()
})
}
}
})]
}
}
You can't, Apple does not allow access to the fingerprint data. This has to do with security.
The iOS SDK only allows you let a user validate them selfs with the Touch ID.
Related
When the the user first decides to use ReplayKit there is an alert that appears. It gives 3 choices:
-Record Screen and Microphone
-Record Screen Only
-Don’t Allow
What are the delegate methods so that I can find out which option a user choose?
There aren't any delegate methods to determine which option a user chooses. You have to use the completionHandler and .isMicrophoneEnabled to determine the chosen option.
Once an option is chosen the completionHandler is called:
If the user chooses Don't Allow then the error code will run
If the user chooses Record Screen & Microphone then .isMicrophoneEnabled will get set to true
If the user chooses Record Screen Only then .isMicrophoneEnabled will get set to false
Inside the completionHandler you can check to see their choice then do whatever you need to do from that point on. Read the 2 comments in the completionHandler part of the code below.
let recorder = RPScreenRecorder.shared()
recorder.startCapture(handler: { [weak self](buffer, bufferType, err) in
// ...
}, completionHandler: { (error) in
// 1. If the user chooses "Dont'Allow", the error message will print "The user declined application recording". Outside of that if an actual error occurs something else will print
if let error = error {
print(error.localizedDescription)
print("The user choose Don't Allow")
return
}
// 2. Check the other 2 options
if self.recorder.isMicrophoneEnabled {
print("The user choose Record Screen & Microphone")
} else {
print("The user choose Record Screen Only")
}
})
The safe way to do this so that you know how to respond to each error code is to use a switch statement on the error codes:
}, completionHandler: { (error) in
if let error = error as NSError? {
let rpRecordingErrorCode = RPRecordingErrorCode(rawValue: error.code)
self.errorCodeResponse(rpRecordingErrorCode)
}
})
func errorCodeResponse(_ error: RPRecordingErrorCode?) {
guard let error = error else { return }
switch error {
case .unknown:
print("Error cause unknown")
case .userDeclined:
print("User declined recording request.")
case .disabled:
print("Recording disabled via parental controls.")
case .failedToStart:
print("Recording failed to start.")
case .failed:
print("Recording error occurred.")
case .insufficientStorage:
print("Not enough storage available on the device.")
case .interrupted:
print("Recording interrupted by another app.")
case .contentResize:
print("Recording interrupted by multitasking and content resizing.")
case .broadcastInvalidSession:
print("Attempted to start a broadcast without a prior session.")
case .systemDormancy:
print("Recording forced to end by the user pressing the power button.")
case .entitlements:
print("Recording failed due to missing entitlements.")
case .activePhoneCall:
print("Recording unable to record due to active phone call.")
default: break
}
}
If you only want to detect when Don't Allow is tapped, here is a simple solution:
recorder.startCapture(handler: { [self] (sampleBuffer, sampleType, passedError) in
if let passedError = passedError {
print(passedError.localizedDescription)
return
}
}) { err in
if let error = err {
if error._code == RPRecordingErrorCode.userDeclined.rawValue {
print("User didn't allow recording")
}
}
}
I have inherited a code base with the following class providing support for Face/Touch ID.
The expected behaviour is that on Face/Touch ID success the user is signed in. This works.
However, should the user fail Face ID and opt to enter their passcode, they are signed out once the completion handler is called. I believe opting to use passcode is triggering
else {
self.authState = .unauthenticated
completion(.unauthenticated)
}
How can I trigger the passcode prompt instead? Should I create a second policy using LAPolicy.deviceOwnerAuthentication and evaluate that instead?
import LocalAuthentication
public enum AuthenticationState {
case unknown
case authenticated
case unauthenticated
public func isAuthenticated() -> Bool {
return self == .authenticated
}
}
public protocol TouchIDAuthenticatorType {
var authState: AuthenticationState { get }
func authenticate(reason: String, completion: #escaping (AuthenticationState) -> Void) -> Void
func removeAuthentication() -> Void
}
public protocol LAContextType: class {
func canEvaluatePolicy(_ policy: LAPolicy, error: NSErrorPointer) -> Bool
func evaluatePolicy(_ policy: LAPolicy, localizedReason: String, reply: #escaping (Bool, Error?) -> Void)
}
public class TouchIDAuthenticator: TouchIDAuthenticatorType {
public var authState: AuthenticationState = .unknown
private var context: LAContextType
private var policy = LAPolicy.deviceOwnerAuthenticationWithBiometrics
public init(context: LAContextType = LAContext()) {
self.context = context
}
public func authenticate(reason: String, completion: #escaping (AuthenticationState) -> Void) -> Void {
var error: NSError?
if context.canEvaluatePolicy(policy, error: &error) {
context.evaluatePolicy(policy, localizedReason: reason) { (success, error) in
DispatchQueue.main.async {
if success {
self.authState = .authenticated
completion(.authenticated)
} else {
self.authState = .unauthenticated
completion(.unauthenticated)
}
}
}
} else {
authState = .authenticated
completion(.authenticated)
}
}
public func removeAuthentication() -> Void {
authState = .unknown
context = LAContext() // reset the context
}
}
extension LAContext: LAContextType { }
I should point out, on the simulator this appears to work as expected, but on a device it does not and I signed out.
You have to use .deviceOwnerAuthentication instead of asking for biometrics. If FaceID is available, it will force the attempt to use this either way.
If you try enough times then you will get another dialogue to "Cancel" or fallback to "Use passcode".
Choosing the fallback will show you the passcode screen.
However, if you specified .deviceOwnerAuthenticationWithBiometrics, you will get the same fallback option. Rather than getting this dialogue I would have expected to receive an error of LAError.Code.biometryLockout. But instead I get this fallback option dialogue. But that is ok...
However, if I then tap the fallback option to "Use passcode", it will NOT present the passcode alert. Instead it fails with a LAError.Code.userFallback error.
If you use the policy without biometrics, you will not get and be able to catch the .userFallback error.
So to sum things up:
If you ask for the deviceOwnerAuthenticationWithBiometrics policy then you will have to handle the fallback yourself.
If you ask for deviceOwnerAuthentication only, then biometrics will be used if available and authorized, otherwise it will automatically fall back to passcode if biometrics is unavailable, or give you the fallback option to enter passcode automatically if biometrics attemps fail.
I am using the following code to implement the touchID/passcode authentication in my app
let context : LAContext = LAContext()
var error: NSError?
// Check if the device can evaluate the policy.
if context.canEvaluatePolicy(LAPolicy.deviceOwnerAuthentication, error: &error) {
context.evaluatePolicy(LAPolicy.deviceOwnerAuthentication,
localizedReason: messageString,
reply: { (success: Bool, evalPolicyError: Error?) -> Void in
if success {
// ...
}
else {
switch evalPolicyError!._code {
case LAError.systemCancel.rawValue:
print("Authentication was cancelled by the system")
case LAError.userCancel.rawValue:
print("Authentication was cancelled by the user")
case LAError.userFallback.rawValue:
print("User selected to enter custom password")
OperationQueue.main.addOperation({ () -> Void in
// ...
})
default:
print("Authentication failed")
OperationQueue.main.addOperation({ () -> Void in
// ...
})
}
}
})
}
Is is possible to customize it? For example:
Choose the number of TouchID attempts before switching to passcode?
In the first AlertView let user choose to switch to passcode with a button (in the current implementation you can access the passcode only if you fail the TouchID auth)
I'm working on integrating touchID into my application. The process was fairly simple, but even just using my dummy data, it takes about 5 seconds after it authenticated my fingerprint, before it performs it's task.
Here's my code:
func requestFingerprintAuthentication() {
let context = LAContext()
var authError: NSError?
let authenticationReason: String = "Login"
if context.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: &authError) {
context.evaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, localizedReason: authenticationReason, reply: {
(success: Bool, error: NSError?) -> Void in
if success {
println("successfull signin with touchID")
self.emailInputField.text = "john.doe#gmail.com"
self.passwordInputField.text = "password"
self.signIn(self.signInButton)
} else {
println("Unable to Authenticate touchID")
}
})
}
}
even with the dummy data, it takes waaay too long.
When I login normally, by typing the email and the password into my inputfields, the signIn() function runs instantly.
To see if it was a problem with that. I tried replacing that, with 2 lines that simply takes me to the correct viewController. But it still takes several seconds after it's authenticated my fingerprint.
I know it's not the phone, nor touchID. Cause it runs my println("successfull signin with touchID") immediately. It's what comes after that, that for some reason takes several seconds for it to run?
Any help explaining this would be greatly appreciated!
The documentation states:
This method asynchronously evaluates an authentication policy.
You are running UI code on a thread that is not the main. Wrap your code to get it to perform on the main thread:
func requestFingerprintAuthentication() {
let context = LAContext()
var authError: NSError?
let authenticationReason: String = "Login"
if context.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: &authError) {
context.evaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, localizedReason: authenticationReason, reply: {
(success: Bool, error: NSError?) -> Void in
if success {
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
println("successfull signin with touchID")
self.emailInputField.text = "john.doe#gmail.com"
self.passwordInputField.text = "password"
self.signIn(self.signInButton)
})
} else {
println("Unable to Authenticate touchID")
}
})
}
}
When the app tries to access the Camera API's in iOS than an OS level alertview is shown.
The user here has to allow access to camera or disable the access.
My question is how can I get notified of the selection made by the user..?
Say he selected don't allow access than is there any notification raised which I can use in my app..?
Any help is appreciated.
Instead of letting the OS show the alert view when the camera appears, you can check for the current authorization status, and request for the authorization manually. That way, you get a callback when the user accepts/rejects your request.
In swift:
let status = AVCaptureDevice.authorizationStatusForMediaType(AVMediaTypeVideo)
if status == AVAuthorizationStatus.Authorized {
// Show camera
} else if status == AVAuthorizationStatus.NotDetermined {
// Request permission
AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVideo, completionHandler: { (granted) -> Void in
if granted {
// Show camera
}
})
} else {
// User rejected permission. Ask user to switch it on in the Settings app manually
}
If the user has previously rejected the request, calling requestAccessForMediaType will not show the alert and will execute the completion block immediately. In this case, you can choose to show your custom alert and link the user to the settings page. More info on this here.
Taken from Kens answer, I've created this Swift 3 protocol to handle permission access:
import AVFoundation
protocol PermissionHandler {
func handleCameraPermissions(completion: #escaping ((_ error: Error?) -> Void))
}
extension PermissionHandler {
func handleCameraPermissions(completion: #escaping ((_ error: Error?) -> Void)) {
let status = AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo)
switch status {
case .authorized:
completion(nil)
case .restricted:
completion(ClientError.noAccess)
case .notDetermined:
AVCaptureDevice.requestAccess(forMediaType: AVMediaTypeVideo) { granted in
if granted {
completion(nil)
} else {
completion(ClientError.noAccess)
}
}
case .denied:
completion(ClientError.noAccess)
}
}
}
You can then conform to this protocol and call it in your class like so:
handleCameraPermissions() { error in
if let error = error {
//Denied, handle error here
return
}
//Allowed! As you were