ios - 如何在具有现有值的 uilabel 上添加一个值并显示它？

Question

我从 uipickerview 获取一个值并将其设置在 uitableviewcell 的 uilabel 上，现在我希望如果我再次从选取器 View 中获取值而不是将其添加到先前的值。

这是我的单元格索引代码:

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
    static NSString *identifier = @"Cell";

    UitableviewcellTableViewCell *Cell = [tableView dequeueReusableCellWithIdentifier:identifier forIndexPath:indexPath];

    if(position == indexPath.row){

    NSString *old  = Cell.nameLabel.text = value;

    int val = [old intValue];

    NSLog(@"val %d", val);



   // Cell.nameLabel.text = [NSString stringWithFormat: @"%d", val+];


   }else{
      Cell.nameLabel.text = @"value";
   }
  NSLog(@"Position :- %ld   %d", (long)indexPath.row, position);

  return Cell;
}

这是我获得值(value)的选择器 View 表单的代码；

  - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
 {

    [self.mytableview reloadData];
    [self hidePickerView];
    NSLog(@"row selected:%ld", (long)row);
    value = _countingarray[row];

 }

Answer 1

-(void)viewDidLoad
{
  value = @"0";
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
  NSLog(@"row selected:%ld", (long)row);
  value = [NSString stringWithFormat:@"%d",[value intval] + [_countingarray[row] intval]];
  [self.mytableview reloadData];
  [self hidePickerView];

}   


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = @"Cell";

    UitableviewcellTableViewCell *Cell = [tableView dequeueReusableCellWithIdentifier:identifier forIndexPath:indexPath];
    Cell.nameLabel.text = value;
    NSLog(@"%@", value);
    return Cell;
}