Example code for fingerprint recognition in IOS applications _ios

After IOS8, Apple released the fingerprint recognition function, uses the Touch ID to identify the user, makes the user authorization, mainly relies on the Localauthentication library

Fingerprint identification: One to determine whether the device supports fingerprint recognition function

Two fingerprint identification, after the success of the corresponding action, failure to remind the user fingerprint recognition failed

First introduce#import <LocalAuthentication/LocalAuthentication.h>

Lacontext *context = [[Lacontext alloc] init];
  Nserror *error = nil; Verify that fingerprint recognition is supported if ([Context Canevaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics Error:&error]) {NSL
    OG (@ "Support fingerprint identification application"); Authentication [Context Evaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics localizedreason:nslocalizedstring (
      @ "Need fingerprints to verify your identity", @ "Hello") reply:^ (BOOL success, Nserror *error) {if (success) {NSLog (@ "successful"); else {switch (error.code) {case Laerrorusercancel:nslog (@ "User cancelled authorization-%@", error.localize
            Ddescription);
          Break
            Case Laerroruserfallback:nslog (@ "user clicks on" Enter Password "button-%@", error.localizeddescription);
          Break
            Case Laerrorauthenticationfailed:nslog (@ "You have been authorized to fail 3 times-%@", error.localizeddescription);
          Break
            Case Laerrortouchidlockout:nslog (@ "Fingerprint is locked-%@", error.localizeddescription);
          Break Case LaerrorSystemcancel:nslog (@ "app goes backstage-%@", error.localizeddescription);
          Break
            Default:nslog (@ "++%@--%zd", Error.localizeddescription, Error.code);
        Break
  }
      }
    }]; else {switch (error.code) {case Laerrorpasscodenotset:nslog (@ "Not set password-%@", Error.localizeddescripti
        ON);
      Break
        Case Laerrortouchidnotenrolled:nslog (@ "not registered touch ID-%@", error.localizeddescription);
      Break
        Case Klaerrortouchidnotavailable:nslog (@ "This device does not support touch ID-%@", error.localizeddescription);
      Break
        Default:nslog (@ "--%@--%zd", Error.localizeddescription, Error.code);
    Break }
  }