After iOS8, Apple released the fingerprint recognition function, which uses touch ID to identify users and authorize users, mainly relying on the LocalAuthentication library
Fingerprint recognition: A determination of whether the device supports fingerprint recognition function
Secondly, recognize fingerprints, make corresponding actions after success, and remind the user to fail to recognize fingerprints after failure.
Introduce first#import <LocalAuthentication/>
LAContext *context = [[LAContext alloc] init];
NSError *error = nil;
//Verify whether fingerprint recognition is supported if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
NSLog(@"Apps that support fingerprint recognition");
//Verify identity [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:NSLocalizedString(@"Fingerprints are required to verify your identity", @"hello") reply:^(BOOL success, NSError *error) {
if (success) {
NSLog(@"success");
} else {
switch () {
case LAErrorUserCancel:
NSLog(@"The user has cancelled the authorization - %@", );
break;
case LAErrorUserFallback:
NSLog(@"The user clicked the "Enter Password" button - %@", );
break;
case LAErrorAuthenticationFailed:
NSLog(@"You have failed authorization 3 times - %@", );
break;
case LAErrorTouchIDLockout:
NSLog(@"Fingerprint locked - %@", );
break;
case LAErrorSystemCancel:
NSLog(@"Application enters the background - %@", );
break;
default:
NSLog(@"++%@--%zd", , );
break;
}
}
}];
} else {
switch () {
case LAErrorPasscodeNotSet:
NSLog(@"Password not set - %@", );
break;
case LAErrorTouchIDNotEnrolled:
NSLog(@"Unregistered Touch ID - %@", );
break;
case kLAErrorTouchIDNotAvailable:
NSLog(@"This device does not support Touch ID - %@", );
break;
default:
NSLog(@"--%@--%zd", , );
break;
}
}