@property (assign, nonatomic) NSIndexPath    *selIndex;   //单选选中的行

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
  return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
  return 10;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    //取消之前的选择
    UITableViewCell *celled = [tableView cellForRowAtIndexPath:_selIndex];
    celled.accessoryType = UITableViewCellAccessoryNone;

    //记录当前的选择的位置
    _selIndex = indexPath;

    //当前选择的打钩
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

  static NSString *cellid = @"cellid";
  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellid];
  if (cell == nil) {
    cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellid];
  }
  cell.textLabel.text = [NSString stringWithFormat:@"第%zi组,第%zi行",indexPath.section+1,indexPath.row];

  if (_selIndex == indexPath) {
     cell.accessoryType = UITableViewCellAccessoryCheckmark;
  }else{
     cell.accessoryType = UITableViewCellAccessoryNone;
  }
  return cell;
}

@property (strong, nonatomic) NSMutableArray  *selectIndexs; //多选选中的行

@property (nonatomic, assign) BOOL       isSingle;    //单选还是多选

UIBarButtonItem *rightItem = [[UIBarButtonItem alloc]initWithTitle:@"多选" style:UIBarButtonItemStylePlain target:self action:@selector(singleSelect)];
  self.navigationItem.rightBarButtonItem = rightItem;

  //初始化多选数组
  _selectIndexs = [NSMutableArray new];

//单选还是多选按钮点击事件
-(void)singleSelect{
  _isSingle = !_isSingle;
  if (_isSingle) {
    self.navigationItem.rightBarButtonItem.title = @"多选";
    self.title = @"(单选)";
    //切换为单选的时候,清除多选数组,重新加载列表
    [self.selectIndexs removeAllObjects];
    [self.tableView reloadData];
  }else{
    self.title = @"(多选)";
    self.navigationItem.rightBarButtonItem.title = @"单选";
  }
}

//选中某一行
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

  if (_isSingle) {    //单选
    //取消之前的选择
    UITableViewCell *celled = [tableView cellForRowAtIndexPath:_selIndex];
    celled.accessoryType = UITableViewCellAccessoryNone;

    //记录当前的选择的位置
    _selIndex = indexPath;

    //当前选择的打钩
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    cell.accessoryType = UITableViewCellAccessoryCheckmark;

  }else{           //多选
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    if (cell.accessoryType == UITableViewCellAccessoryCheckmark) { //如果为选中状态
      cell.accessoryType = UITableViewCellAccessoryNone; //切换为未选中
      [_selectIndexs removeObject:indexPath]; //数据移除
    }else { //未选中
      cell.accessoryType = UITableViewCellAccessoryCheckmark; //切换为选中
      [_selectIndexs addObject:indexPath]; //添加索引数据到数组
    }
  }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

  static NSString *cellid = @"cellid";
  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellid];
  if (cell == nil) {
    cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellid];
  }
  cell.textLabel.text = [NSString stringWithFormat:@"第%zi组,第%zi行",indexPath.section+1,indexPath.row];

  if (_isSingle) {      //单选
    if (_selIndex == indexPath) {
      cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }else{
      cell.accessoryType = UITableViewCellAccessoryNone;
    }
    return cell;
  }else{           //多选
    cell.accessoryType = UIAccessibilityTraitNone;
    for (NSIndexPath *index in _selectIndexs) {
      if (indexPath == index) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
      }
    }
  }
  return cell;
}