ios 指纹登陆

LAContext *myContext = [[LAContext alloc] init];        NSString *reason = @"请验证已有指纹";                myContext.localizedFallbackTitle = @"";        [myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:reason reply:^(BOOL success, NSError *error) {            //放入主线程            dispatch_async(dispatch_get_main_queue(), ^{                if(success){//成功                    [self loginWithTouchID];                                    }else{                    if(error.code == -2){//点击取消按钮                    }                }            });        }];