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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.

If you want to take this project further, try using the #if compiler directives from project 26 to make the if true hack work for the simulator and be in the code at the same time as the real Touch ID/Face ID code.

If you're looking for something harder, try creating a password system for your app so that the Touch ID/Face ID fallback is more useful. You'll need to use the addTextField() from project 5, and I suggest you save the password in the keychain!

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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 Mario Kart world champion. OK, so that last part isn't true. If you're curious you can learn more here.

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