iOS fingerprint recognition

1-(void) createfingerprint{2Lacontext *mycontext =[[Lacontext alloc] init];3Nserror *autherror =Nil;4NSString *mylocalizedreasonstring =@"Please verify that you have a fingerprint";5     6     //determine if the device supports fingerprint identification7     if([Mycontext canevaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics error:&Autherror]) {8         if([[[[Nsuserdefaults Standarduserdefaults]objectforkey:@"Zhiwenshibie"]isequaltostring:[finance_tools GetUserID]]) {Ten             //Fingerprint identification only determines whether the current user is the master of the machine A [Mycontext evaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics - localizedreason:mylocalizedreasonstring -reply:^ (BOOL success, Nserror *error) { the                                     if(Success) { -                                         //User authenticated successfully, take appropriate action -NSLog (@"Fingerprint authentication Successful"); -Dispatch_async (Dispatch_get_main_queue (), ^{ +  -[Self createtixiandownload:[[nsuserdefaults standarduserdefaults] Objectforkey:@"PassWord"]]; +                                         });                                      -}Else { -NSLog (@"fingerprint authentication failed,%@", error.description); -                                 inDispatch_async (Dispatch_get_main_queue (), ^{ -                                              to                                             //back to main thread action code block +                                             if([[@ (Error.code) stringvalue] isequaltostring:@"-2"]|| [@ (Error.code) stringvalue] isequaltostring:@"-4"]) { -}Else if([[@ (Error.code) stringvalue] isequaltostring:@"-3"]|| [@ (Error.code) stringvalue] isequaltostring:@"-8"]|| [@ (Error.code) stringvalue] isequaltostring:@"-1"]){ the //Failure reason, popup box enter password *                                                  $                                             }Panax Notoginseng                                              -                                         }); the                                          +                                          A                                     } the                                 }]; +              -}Else{ $ //Turn on fingerprint identification $         } -}Else { -         //Could not evaluate policy, look at Autherror and present a appropriate message to user theNSLog (@"TouchID device is not available"); -         //TouchID no fingerprint setWuyi         //Turn off password (System if not set password TouchID cannot be enabled) the          -Pop-up bullet box enter password

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Reason for failure:

1NSLog (@"fingerprint authentication failed,%@", error.description);2                                     //Error code Error.code3                                     //-1: Three consecutive fingerprint recognition errors4                                     //-2: Click the Cancel button in the TouchID dialog box5                                     //-3: Click the Enter Password button in the TouchID dialog box6                                     //The -4:touchid dialog is canceled by the system, for example, by pressing home or the Power key7                                     //-8: Five consecutive fingerprint recognition errors, TouchID function is locked, the next time you need to enter the system password8                                     

iOS fingerprint recognition