iOS: Authenticating with TouchID

Hi guys!

Today we will learn how to use Touch ID authentication with Swift 3.

Let’s rock.

Step 1: create a new project and named it TouchIdDemo.

Step 2: on ViewController, create a method to call touch ID verification after view appear:

Step 3: Nice! Now, to use touch ID framework we must to import the LocalAuthentication framework.

Click on your project:

Scroll to bottom, go to Linked Frameworks and Libraries and import the framework:

Step 4: go to your ViewController and import the lib:

Step 5: in authenticateWithTouchId that we have created, create a context and check if touch ID is avaliable:

The errorPointer is a variable that contains the error description when touch ID is not available.

Step 6: create a method named requestTouchIdValidation and call int on authenticateWithTouchId:

Step 7: handle success authentication:

Step 8: handle error authentication

Important: the touch ID only works on physical device. Don’t try it on simulator.

Github Project: https://github.com/benhurott/ios-touch-id-demo