按位与或取反（|&~）在项目中的运用

• (KKUserInfoShowMask)getUserInfoShowMaskWithIndexpath:(NSIndexPath *)indexPath andSwitchOn:(BOOL)isOn {
  NSString *title = self.sectionDatas[indexPath.section][indexPath.row];
  KKUserInfoShowMask mask;
  if ([title isEqualToString:KKLocalized(@"kPhone")]) {
  mask = KKUserInfoShowMaskMobile;
  } else if ([title isEqualToString:KKLocalized(@"kTel")]) {
  mask = KKUserInfoShowMaskTel;
  }else if ([title isEqualToString:KKLocalized(@"kPosition")]) {
  mask = KKUserInfoShowMaskPost;
  } else if ([title isEqualToString:KKLocalized(@"kEMail")]) {
  mask = KKUserInfoShowMaskEmail;
  } else if ([title isEqualToString:KKLocalized(@"kAddress")]) {
  mask = KKUserInfoShowMaskAddr;
  } else if ([title isEqualToString:KKLocalized(@"kJobNumber")]) {
  mask = KKUserInfoShowMaskStaffId;
  } else {
  mask = KKUserInfoShowMaskNone;
  }
  //当开启该位时 按位或
  //当关闭该位时，先按位取反，再按位与
  if (isOn) {
  return (self.userInfo.showMask | mask);
  } else {
  return self.userInfo.showMask & (~mask);
  }
  }