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Wrap up

The great thing about biometric authentication is that you don't get any access to fingerprints, face scans, or other secure information. Instead, the system does all the authentication for you, which keeps both your app and users safe.

More importantly, users trust it: they know that Touch ID and Face ID are highly secure system that guarantee security in our apps, so it immediately makes our apps feel both more personal and more safe.

Review what you learned

Anyone can sit through a tutorial, but it takes actual work to remember what was taught. It’s my job to make sure you take as much from these tutorials as possible, so I’ve prepared a short review to help you check your learning.

Click here to review what you learned in project 28.

Challenge

One of the best ways to learn is to write your own code as often as possible, so here are three ways you should try your new knowledge to make sure you fully understand what’s going on:

  1. Add a Done button as a navigation bar item that causes the app to re-lock immediately rather than waiting for the user to quit. This should only be shown when the app is unlocked.
  2. Create a password system for your app so that the Touch ID/Face ID fallback is more useful. You'll need to use an alert controller with a text field like we did in project 5, and I suggest you save the password in the keychain!
  3. Go back to project 10 (Names to Faces) and add biometric authentication so the user’s pictures are shown only when they have unlocked the app. You’ll need to give some thought to how you can hide the pictures – perhaps leave the array empty until they are authenticated?
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Share your success!

One of the most effective motivators of success is sharing your progress with other people – when you tell folks what you're doing and what you've learned, it encourages you to come back for more, which in turn will help you reach your app development goals faster.

So, now that you've done all the hard work it's time to share your success: tell folks that you've completed this project, either by clicking the button below to start composing a tweet, or by writing your own message from scratch. This will definitely encourage you to keep learning, but it will also help other folks discover my work – thank you!

 

About the author

Paul Hudson is the creator of Hacking with Swift, the most comprehensive series of Swift books in the world. He's also the editor of Swift Developer News, the maintainer of the Swift Knowledge Base, and a speaker at Swift events around the world. If you're curious you can learn more here.

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