Question 1

How do I add fingerprint login to my Xamarin.Forms app?

Accepted Answer

Install the Plugin.Fingerprint NuGet package, set up platform-specific configurations like Info.plist for iOS and AndroidManifest.xml, then use CrossFingerprint.Current.AuthenticateAsync with an AuthenticationRequestConfiguration. The README includes code examples and a YouTube tutorial for guidance.

Question 2

What's the difference between Plugin.Fingerprint and writing native biometric code for each platform?

Accepted Answer

Plugin.Fingerprint saves time by providing a unified API that handles platform differences, but native code offers more customization, especially for UI elements like dialogs on iOS. This plugin is ideal for consistency, while native approaches are better for fine-tuned control.

Question 3

Does the Xamarin fingerprint plugin support Face ID on newer iPhones?

Accepted Answer

Yes, it supports Face ID on iOS devices. You must add NSFaceIDUsageDescription to your Info.plist to describe the usage, as per Apple's requirements, otherwise the app may crash on iOS 11.3+.

Question 4

How can I test biometric authentication in Android emulators?

Accepted Answer

Enroll a fingerprint in the emulator settings, then use telnet commands like 'finger touch 1' to simulate sensor events, as detailed in the README. This allows testing without physical hardware, though Windows users need to enable Telnet Client first.

Question 5

Is there a MvvmCross version of the fingerprint plugin?

Accepted Answer

Yes, there's a separate NuGet package called MvvmCross.Plugins.Fingerprint that integrates with the MvvmCross framework, allowing dependency injection of the IFingerprint service for more streamlined usage in MvvmCross apps.

Question 6

What are the limitations of using this plugin on Windows UWP?

Accepted Answer

On UWP, the plugin does not support alternative authentication methods, meaning users can only use biometrics and not fallback options like PIN or password. This might limit accessibility in scenarios where biometrics fail or aren't available.

Fingerprint Plugin

What is Fingerprint Plugin?

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Pros & Cons

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