指纹识别 人脸识别

//1.判断iOS8及以后的版本

    if([UIDevice currentDevice].systemVersion.doubleValue >= 8.0){

        //从iPhone5S开始,出现指纹识别技术,所以说在此处可以进一步判断是否是5S以后机型

        //2.创建本地验证上下文对象-->这里导入框架LocalAuthentication

        LAContext *context = [LAContext new];

        // 3.判断能否使用指纹识别

        //Evaluate: 评估

        //Policy: 策略

        //LAPolicyDeviceOwnerAuthenticationWithBiometrics: 设备拥有者授权 用 生物识别技术

        if([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:nil]){

            //4.在可以使用的前提下就会调用

            //localizedReason本地原因alert显示

            NSString *localizedReason = @"指纹登录";

            if (@available(iOS 11.0, *)) {

                if (context.biometryType == LABiometryTypeTouchID) {

                   

                }else if (context.biometryType == LABiometryTypeFaceID){

                    localizedReason = @"人脸识别";

                }

            } else {

                // Fallback on earlier versions

            }

            [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:localizedReason reply:^(BOOL success, NSError * _Nullable error) {

                if (success) {

  

                }else {

                    //不需要统计用户取消

                    if(error.code != -2){

                        //  指纹识别Touch ID提供3+2 = 5次指纹识别机会----->3次识别失败后，指纹验证框消失(会报错code = -1)然后点击指纹会再次弹框可验证两次，如果五次指纹识别全部错误，就需要手动输入数字密码，数字密码可以输入6次，如果6次输入密码错误，系统停止验证，等待验证时间后会提供再次验证的机会,正确及验证成功(1次),错误则时间累加等待验证,以此类推. (iOS10不一样, 5次之后有问题: 需要进入设置中 -- TouchID与密码, 输入一次密码, 就可以解开)

                        //Code=-2 "Canceled by user

                        //Code=-1 "Application retry limit exceeded."

                        //Code=-8 "Biometry is locked out."

//                        NSLog(@"error: %@", error);

                        //有的情况, 需要对错误的次数做累计, 此时就需要排除用户取消

                    }

//                    switch (error.code)

//                    {

//                        case LAErrorAuthenticationFailed: // Authentication was not successful, because user failed to provide valid credentials

//                        {

//                            NSLog(@"授权失败"); // -1 连续三次指纹识别错误

//                        }

//                            break;

//                        case LAErrorUserCancel: // Authentication was canceled by user (e.g. tapped Cancel button)

//                        {

//                            NSLog(@"用户取消验证Touch ID"); // -2 在TouchID对话框中点击了取消按钮

//

//                        }

//                            break;

//                        case LAErrorUserFallback: // Authentication was canceled, because the user tapped the fallback button (Enter Password)

//                        {

//                            [[NSOperationQueue mainQueue] addOperationWithBlock:^{

//                                NSLog(@"用户选择输入密码，切换主线程处理"); // -3 在TouchID对话框中点击了输入密码按钮

//                            }];

//

//                        }

//                            break;

//                        case LAErrorSystemCancel: // Authentication was canceled by system (e.g. another application went to foreground)

//                        {

//                            NSLog(@"取消授权，如其他应用切入，用户自主"); // -4 TouchID对话框被系统取消，例如按下Home或者电源键

//                        }

//                            break;

//                        case LAErrorPasscodeNotSet: // Authentication could not start, because passcode is not set on the device.

//

//                        {

//                            NSLog(@"设备系统未设置密码"); // -5

//                        }

//                            break;

//                        case LAErrorTouchIDNotAvailable: // Authentication could not start, because Touch ID is not available on the device

//                        {

//                            NSLog(@"设备未设置Touch ID"); // -6

//                        }

//                            break;

//                        case LAErrorTouchIDNotEnrolled: // Authentication could not start, because Touch ID has no enrolled fingers

//                        {

//                            NSLog(@"用户未录入指纹"); // -7

//                        }

//                            break;

//

//#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_9_0

//                        case LAErrorTouchIDLockout: //Authentication was not successful, because there were too many failed Touch ID attempts and Touch ID is now locked. Passcode is required to unlock Touch ID, e.g. evaluating LAPolicyDeviceOwnerAuthenticationWithBiometrics will ask for passcode as a prerequisite 用户连续多次进行Touch ID验证失败，Touch ID被锁，需要用户输入密码解锁，先Touch ID验证密码

//                        {

//                            NSLog(@"Touch ID被锁，需要用户输入密码解锁"); // -8 连续五次指纹识别错误，TouchID功能被锁定，下一次需要输入系统密码

//                        }

//                            break;

//                        case LAErrorAppCancel: // Authentication was canceled by application (e.g. invalidate was called while authentication was in progress) 如突然来了电话，电话应用进入前台，APP被挂起啦");

//                        {

//                            NSLog(@"用户不能控制情况下APP被挂起"); // -9

//                        }

//                            break;

//                        case LAErrorInvalidContext: // LAContext passed to this call has been previously invalidated.

//                        {

//                            NSLog(@"LAContext传递给这个调用之前已经失效"); // -10

//                        }

//                            break;

//#else

//#endif

//                        default:

//                        {

//                            [[NSOperationQueue mainQueue] addOperationWithBlock:^{

//                                NSLog(@"其他情况，切换主线程处理");

//                            }];

//                            break;

//                        }

//                    }

                }

            }];

        }else{

//            NSLog(@"请确保(5S以上机型),TouchID未打开");

        }

    }else{

//        NSLog(@"此设备不支持指纹识别"");

    }