IndexPath.row 多个部分的错误值

Question

每个部分都有部分和不同的数组。它工作得很好，并显示了正确的对象。但是当我将标签设置为 UIBUtton 时，作为 button.tag 传递的 indexPath.row 在第二个会话中返回 1 而不是 0..

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

{

NSString *sectionTitle = [sectionsTitles objectAtIndex:indexPath.section];
NSArray *secAtt = [attractions objectForKey:sectionTitle];

Evento *evento = (Evento*)[secAtt objectAtIndex:indexPath.row];

UITableViewCell *cell = nil;
if(evento.listaImagens && [evento.listaImagens count] > 0) {
    cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
}
else {
    cell = [tableView dequeueReusableCellWithIdentifier:@"CellSemFoto" forIndexPath:indexPath];
}

    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
 UIButton *btnCompartilhar = (UIButton *)[cell.contentView viewWithTag:40];
    [btnCompartilhar.titleLabel setHidden:YES];
    btnCompartilhar.titleLabel.text = sectionTitle;
    btnCompartilhar.tag = indexPath.row;
    [btnCompartilhar addTarget:self action:@selector(compartilharClick:) forControlEvents:UIControlEventTouchDown];
  return cell;
 }

在这里我得到了 indexPath

  UIButton *botaoCompartilhar = (UIButton *)sender;
   int index = botaoComapartilhar.tag;

索引在第二部分的第一行返回 1

编辑 我发现 indexpath.row 是正确的，但没有设置 botaoCompartilhar.tag。

我是通过以下代码发现的：

 UIButton *btnCompartilhar = (UIButton *)[cell.contentView viewWithTag:40];
[btnCompartilhar.titleLabel setHidden:YES];
btnCompartilhar.titleLabel.text = sectionTitle;
btnCompartilhar.tag = indexPath.row;
[btnCompartilhar addTarget:self action:@selector(compartilharClick:) forControlEvents:UIControlEventTouchDown];
NSLog(@"%@ %i %i", evento.entretenimento.nome, btnCompartilhar.tag, indexPath.row);

Answer 1

两个观察结果：

1. 您有两个部分，然后如果您将标签设置为 indexPath.row，那么在选择器中您将有两个带有标签 1 的按钮，两个用于标签 2，依此类推。
2. 我更喜欢使用 Control UIControlEventTouchUpInside 而不是 UIControlEventTouchDown。

所以总结一下，尝试做：

btnCompartilhar.tag = indexPath.section*1000 + indexPath.row;

代替：

btnCompartilhar.tag = indexPath.row;

因此，您将获得所有按钮的唯一标记值。然后您需要管理索引，例如：

NSInteger indexSection = (button.tag)/1000;
NSInteger indexRow = (button.tag)%1000;

if (indexSection == 0){
    //first section
    //go get the element on index indexRow of the first section array
} else {
    //second section
    //go get the element on index indexRow of the second section array
}

Answer 2

问题是我使用viewWithTag并将Button的标签更改为indexPath.row...然后下一次，没有viewWithTag 40。

我的解决方案是

  UIButton *btnCompartilhar = (UIButton *)[cell.contentView viewWithTag:40];
[btnCompartilhar.titleLabel setHidden:YES];
btnCompartilhar.titleLabel.text = [NSString stringWithFormat:@"%i|%@",indexPath.row, sectionTitle]; 
[btnCompartilhar addTarget:self action:@selector(compartilharClick:) forControlEvents:UIControlEventTouchDown];

并获取 indexPath.row 和 sectionTitle：

int tag = 0;
NSString *titleLabel = botaoCompartilhar.titleLabel.text;

NSRange range = [botaoCompartilhar.titleLabel.text rangeOfString:@"|"];
if(range.location != NSNotFound) {
    NSString *tagStr = [botaoCompartilhar.titleLabel.text substringToIndex:range.location];
    tag = [tagStr intValue];
    if([botaoCompartilhar.titleLabel.text length] > range.location+1)
        titleLabel = [botaoCompartilhar.titleLabel.text substringFromIndex:range.location+1];
}