iOS 指纹解锁验证TouchID功能

#import <localauthentication/localauthentication.h>

//ios8.0后才支持指纹识别接口
  if ([uidevice currentdevice].systemversion.floatvalue < 8.0) {
    return;
  }

- (void)evaluateauthenticate
{
  //创建lacontext
  lacontext* context = [[lacontext alloc] init];
  nserror* error = nil;
  nsstring* result = @"请验证已有指纹";
  //首先使用canevaluatepolicy 判断设备支持状态
  if ([context canevaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics error:&error]) {
    //支持指纹验证
    [context evaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics localizedreason:result reply:^(bool success, nserror *error) {
      if (success) {
        //验证成功，主线程处理ui
      }
      else
      {
        nslog(@"%@",error.localizeddescription);
        switch (error.code) {
          case laerrorsystemcancel:
          {
            //系统取消授权，如其他app切入
            break;
          }
          case laerrorusercancel:
          {
            //用户取消验证touch id
            break;
          }
          case laerrorauthenticationfailed:
          {
            //授权失败
            break;
          }
          case laerrorpasscodenotset:
          {
            //系统未设置密码
            break;
          }
          case laerrortouchidnotavailable:
          {
            //设备touch id不可用，例如未打开
            break;
          }
          case laerrortouchidnotenrolled:
          {
            //设备touch id不可用，用户未录入
            break;
          }
          case laerroruserfallback:
          {
            [[nsoperationqueue mainqueue] addoperationwithblock:^{
              //用户选择输入密码，切换主线程处理
            }];
            break;
          }
          default:
          {
            [[nsoperationqueue mainqueue] addoperationwithblock:^{
              //其他情况，切换主线程处理
            }];
            break;
          }
        }
      }
    }];
  }
  else
  {
    //不支持指纹识别，log出错误详情
    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);
  }
}