Xamarin.iOS
Raak ID aan

parameters

Opmerkingen

if (context.CanEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, out AuthError))

context.EvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, myReason, replyHandler);

var replyHandler = new LAContextReplyHandler((success, error) =>
    {

        this.InvokeOnMainThread(() =>
        {
            if (success)
            {
                Console.WriteLine("You logged in!");
                PerformSegue("AuthenticationSegue", this);
            }
            else {
                //Show fallback mechanism here
            }
        });

    });

if (context.CanEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, out AuthError))
{
    var policyState = context.EvaluatedPolicyDomainState;

    var replyHandler = new LAContextReplyHandler((success, error) =>
    {

        this.InvokeOnMainThread(() =>
        {
            if (success)
            {
                Console.WriteLine("You logged in!");
                PerformSegue("AuthenticationSegue", this);
            }
            else {
                //Show fallback mechanism here
            }
        });

    });
    context.EvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, myReason, replyHandler);
};

Voeg Touch ID toe aan uw app

Stel eerst vast of het apparaat Touch ID-invoer kan accepteren.

if (context.CanEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, out AuthError))

Als dit het geval is, kunnen we de Touch ID UI weergeven met behulp van:

context.EvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, myReason, replyHandler);

Er zijn drie soorten informatie die we moeten doorgeven aan EvaluatePolicy - het beleid zelf, een string die uitlegt waarom authenticatie noodzakelijk is, en een antwoordhandler. De antwoordhandler vertelt de toepassing wat deze moet doen in het geval van een succesvolle of niet-succesvolle authenticatie.

Een van de kanttekeningen bij lokale authenticatie is dat het op de voorgrond moet worden uitgevoerd, dus zorg ervoor dat u InvokeOnMainThread voor de antwoordhandler:

var replyHandler = new LAContextReplyHandler((success, error) =>
{
    this.InvokeOnMainThread(() =>
    {
        if (success)
        {
            Console.WriteLine("You logged in!");
            PerformSegue("AuthenticationSegue", this);
        }
        else {
            //Show fallback mechanism here
        }
    });
});

Om te bepalen of de database van geautoriseerde vingerafdrukken is gewijzigd, kunt u de ondoorzichtige structuur (NSData) controleren die wordt geretourneerd door context.EvaluatedPolicyDomainState . Uw app moet de beleidsstatus opslaan en vergelijken om wijzigingen te detecteren. Een ding om op te merken welke Apple zegt:

De aard van de wijziging kan echter niet worden bepaald op basis van deze gegevens.

if (context.CanEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, out AuthError))
{
    var policyState = context.EvaluatedPolicyDomainState;

    var replyHandler = new LAContextReplyHandler((success, error) =>
    {

        this.InvokeOnMainThread(() =>
        {
            if (success)
            {
                Console.WriteLine("You logged in!");
                PerformSegue("AuthenticationSegue", this);
            }
            else {
                //Show fallback mechanism here
            }
        });

    });
    context.EvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, myReason, replyHandler);
};

Voorbeeld van knop

partial void AuthenticateMe(UIButton sender)
{
    var context = new LAContext();
    //Describes an authentication context 
    //that allows apps to request user authentication using Touch ID.
    NSError AuthError;
    //create the reference for error should it occur during the authentication.
    var myReason = new NSString("To add a new chore");
    //this is the string displayed at the window for touch id

    if (context.CanEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, out AuthError)) 
    // check if the device have touchId capabilities.
    {
        var replyHandler = new LAContextReplyHandler((success, error) =>
        {

            this.InvokeOnMainThread(() =>
            {
                if (success)
                {
                    Console.WriteLine("You logged in!");
                    PerformSegue("AuthenticationSegue", this);
                }
                else {
                    //Show fallback mechanism here
                }
            });

        });
        context.EvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, myReason, replyHandler);//send touch id request
    };
}

Sleutelhanger gebruiken

Werkbron - https://github.com/benhysell/V.TouchIdExample

Lange formulierbeschrijving - http://benjaminhysell.com/archive/2014/11/authentication-in-xamarin-ios-with-touch-id-or-passcode/

//Simple View with a switch to enable / disable Touch ID and 
//a button to invoke authentication 

/// <summary>
/// Enable/Disable Touch ID
/// </summary>
/// <param name="sender">Sender.</param>
partial void TouchIdEnableDisable(UISwitch sender)
{
    if (sender.On)
    {
        //enable Touch ID          
        //set our record
        //note what you fill in here doesn't matter, just needs to be 
        //consistent across all uses of the record
        var secRecord = new SecRecord(SecKind.GenericPassword)
        {
            Label = "Keychain Item",
            Description = "fake item for keychain access",
            Account = "Account",
            Service = "com.yourcompany.touchIdExample",
            Comment = "Your comment here",
            ValueData = NSData.FromString("my-secret-password"),
            Generic = NSData.FromString("foo")
        };

        secRecord.AccessControl = new SecAccessControl(SecAccessible.WhenPasscodeSetThisDeviceOnly, SecAccessControlCreateFlags.UserPresence);
        SecKeyChain.Add(secRecord);
                                
        authenticateButton.Enabled = true;
    }
    else
    {
        //disable Touch ID
        var record = new SecRecord(SecKind.GenericPassword)
        {
            Service = "com.yourcompany.touchIdExample",
            UseOperationPrompt = "Authenticate to Remove Touch ID / Passcode from Test App"
        };

        SecStatusCode result;

        //query one last time to ensure they can remove it
        SecKeyChain.QueryAsRecord(record, out result);
        if (SecStatusCode.Success == result || SecStatusCode.ItemNotFound == result)
        {
            //remove the record
            SecKeyChain.Remove(record);
            authenticateButton.Enabled = false;
        }
        else
        {
            //could not authenticate, leave switch on
            sender.On = true;
         }                
    }
}

/// <summary>
/// Show Touch ID to user and evaluate authentication
/// </summary>
/// <param name="sender">Sender.</param>
partial void AuthenticateUser(UIButton sender)
{
    var rec = new SecRecord(SecKind.GenericPassword)
    {
        Service = "com.yourcompany.touchIdExample",
        UseOperationPrompt = "Authenticate to access Test App"
    };
    SecStatusCode res;
    SecKeyChain.QueryAsRecord(rec, out res);
    if (SecStatusCode.Success == res || SecStatusCode.ItemNotFound == res)
    {
        //Success!!  
        //add your code here to continue into your application
        AuthenticatedLabel.Hidden = false;
    }
    else
    {
        //Failure
        AuthenticatedLabel.Hidden = true;
    }
}