iphone - 如何在每一行中分别增加Label值，表格包含这么多Section

Question

我有一个UITableView一定数量的部分和行。

当用户选择一个单元格时，如何在 My ViewController 中执行加号和减号按钮的操作？我的意思是分别增加每一行的标签值？

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
{
    NSArray *toBeReturned = [NSArray arrayWithArray:
                             [@"A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z"
                              componentsSeparatedByString:@"|"]];

    return toBeReturned;
}

//行的单元格

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *MyIdentifier= @"MyIdentifier";
    LocationsCustomCell *cell= (LocationsCustomCell *)[tableView dequeueReusableCellWithIdentifier:MyIdentifier];
    if(cell==nil)
    {
        [[NSBundle mainBundle] loadNibNamed:@"LocationsCustomCell" owner:self options:nil];
        cell=locationCustomcell;
    }
    @try
    {
        if(indexPath.section<=[arrayOfCharacters count])
        {
            NSString *sortedStr =[[objectsForCharacters objectForKey:[arrayOfCharacters objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];

            if([sortedStr isKindOfClass:[NSNull class]])
            {
                cell.locationNameLabel.text=@"";
            }
            else
            {
                cell.locationNameLabel.text=sortedStr;
                cell.locationNameLabel.textColor=[UIColor blackColor];
            }
        }
    }
    @catch (NSException *exception)
    {

    }
    sectionNo=indexPath.section;

     cell.plusButn.tag  = sectionNo*100+indexPath.row;
     cell.minusButn.tag = sectionNo*100+indexPath.row;
     cell.locationCountLabel.tag=sectionNo*100+indexPath.row;

     plusElement=[indexPath row];
   // NSInteger sectionmame=[indexPath section];
   // NSInteger rowname =[indexPath row];
     minusElement=[indexPath row];
     countLabelElement=[indexPath row];

    [cell.plusButn addTarget:self action:@selector(plusButnPressed:) forControlEvents:UIControlEventValueChanged];

    //[cell.plusButn addTarget: self
                      // action: @selector(buttonPressed:withEvent:)
             //forControlEvents: UIControlEventTouchUpInside];

   // [cell.minusButn addTarget:self action:@selector(minusButnPressed:) forControlEvents:UIControlEventValueChanged];

    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];

    return cell;
}


-(IBAction)plusButnPressed:(id)sender
{
    NSLog(@"selectedSection Number/plusButn is--%d",sectionNumber);
    LocationsCustomCell *cell=(LocationsCustomCell *)[self.locationsTableVw cellForRowAtIndexPath:[NSIndexPath indexPathForRow:plusElement inSection:sectionNumber]];
    cell.plusButn=(UIButton *)sender;
    if (cell.plusButn)
    {
        Countvalue++;
        NSString *ValueStr= [NSString stringWithFormat:@"%d",Countvalue];
        cell.locationCountLabel.text=ValueStr;
    }
}

-(IBAction)minusButnPressed:(id)sender
{
    NSLog(@"selectedSection Number/minusButn is--%d",sectionNumber);
    LocationsCustomCell *cell=(LocationsCustomCell *)[self.locationsTableVw cellForRowAtIndexPath:[NSIndexPath indexPathForRow:minusElement inSection:sectionNumber]];
    cell.minusButn=(UIButton *)sender;
    if (cell.minusButn)
    {
        Countvalue--;
        NSString *ValueStr= [NSString stringWithFormat:@"%d",Countvalue];
        cell.locationCountLabel.text=ValueStr;
    }
}

Answer 1

试试看

在 CellForrowAtIndexPath

    [theCell.button addTarget: self
               action: @selector(buttonPressed:withEvent:)
     forControlEvents: UIControlEventTouchUpInside];

然后您的事件处理程序将如下所示：

      - (void) buttonPressed: (id) sender withEvent: (UIEvent *) event
      {
          UITouch * touch = [[event touches] anyObject];
          CGPoint location = [touch locationInView: self.tableView];
          NSIndexPath * indexPath = [self.tableView indexPathForRowAtPoint: location];

           /* indexPath contains the index of the row containing the button */
         Nsstring *str=[self.tableView cellForRowAtIndexPath:indexPath].locationCountLabel.text;

           int a=[str intValue];
            a=a+1;
           [self.tableView cellForRowAtIndexPath:indexPath].locationCountLabel.text=[NSString stringWithFormat:@"%d",a];

      }

你可以用减号来完成，同样的方法只是减少a的值。

编辑

把这条线

         [cell.plusButn addTarget:self action:@selector(plusButnPressed:) forControlEvents:UIControlEventValueChanged];

in if (cell==nil) 像这样运行你的代码而不是我的代码。

    if(cell==nil)
    {
            [[NSBundle mainBundle] loadNibNamed:@"LocationsCustomCell" owner:self options:nil];
            cell=locationCustomcell;
            [cell.plusButn addTarget:self action:@selector(plusButnPressed:) forControlEvents:UIControlEventTouchUpInside]; /////////this line is put here 

    }