#import <LocalAuthentication/LocalAuthentication.h>

- (BOOL)canEvaluatePolicy:(LAPolicy)policy error:(NSError * __autoreleasing *)error __attribute__((swift_error(none)));

- (void)evaluatePolicy:(LAPolicy)policy
  localizedReason:(NSString *)localizedReason
     reply:(void(^)(BOOL success, NSError * __nullable error))reply;

 //创建LAContext
 LAContext *context = [LAContext new];

 
 //这个属性是设置指纹输入失败之后的弹出框的选项
 context.localizedFallbackTitle = @"没有忘记密码";

NSError *error = nil;
 if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
  NSLog(@"支持指纹识别");
  [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"指纹解锁" reply:^(BOOL success, NSError * _Nullable error) {
   if (success) {
    NSLog(@"验证成功 刷新主界面");
   }else{
    NSLog(@"%@",error.localizedDescription);
    switch (error.code) {
     case LAErrorSystemCancel:
     {
      NSLog(@"系统取消授权，如其他APP切入");
      break;
     }
     case LAErrorUserCancel:
     {
      NSLog(@"用户取消验证Touch ID");
      break;
     }
     case LAErrorAuthenticationFailed:
     {
      NSLog(@"授权失败");
      break;
     }
     case LAErrorPasscodeNotSet:
     {
      NSLog(@"系统未设置密码");
      break;
     }
     case LAErrorTouchIDNotAvailable:
     {
      NSLog(@"设备Touch ID不可用，例如未打开");
      break;
     }
     case LAErrorTouchIDNotEnrolled:
     {
      NSLog(@"设备Touch ID不可用，用户未录入");
      break;
     }
     case LAErrorUserFallback:
     {
      [[NSOperationQueue mainQueue] addOperationWithBlock:^{
       NSLog(@"用户选择输入密码，切换主线程处理");
      }];
      break;
     }
     default:
     {
      [[NSOperationQueue mainQueue] addOperationWithBlock:^{
       NSLog(@"其他情况，切换主线程处理");
      }];
      break;
     }
    }
   }
  }];
 }else{
  NSLog(@"不支持指纹识别");
  switch (error.code) {
   case LAErrorTouchIDNotEnrolled:
   {
    NSLog(@"TouchID is not enrolled");
    break;
   }
   case LAErrorPasscodeNotSet:
   {
    NSLog(@"A passcode has not been set");
    break;
   }
   default:
   {
    NSLog(@"TouchID not available");
    break;
   }
  }

  NSLog(@"%@",error.localizedDescription);
 }