Determine if an iOS device supports TouchID without setting passcode

Question

I\'m currently developing an iOS app that enables users to log in to the app using TouchID, but firstly they must set up a password inside the app first. Problem is, to show

Answer 1

For iOS 11+ you can use biometryType: LABiometryType of LAContext. More from Apple documentation:

/// Indicates the type of the biometry supported by the device.
///
/// @discussion  This property is set only when canEvaluatePolicy succeeds for a biometric policy.
///              The default value is LABiometryTypeNone.
@available(iOS 11.0, *)
open var biometryType: LABiometryType { get }

@available(iOS 11.0, *)
public enum LABiometryType : Int {

    /// The device does not support biometry.
    @available(iOS 11.2, *)
    case none

    /// The device does not support biometry.
    @available(iOS, introduced: 11.0, deprecated: 11.2, renamed: "LABiometryType.none")
    public static var LABiometryNone: LABiometryType { get }

    /// The device supports Touch ID.
    case touchID

    /// The device supports Face ID.
    case faceID
}