iphone - 更改 UITableViewCell 附件后 UITableViewCellAccessoryDe​​tailDisclosureButton 消失

Question

我有一个 UITableView，其中包含带有图像、文本和披露按钮的单元格。我正在像这样加载单元格:

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

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if(!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
    }

    if ([indexPath row] == [[self multas] count]) {
        [[cell textLabel] setText:@"Carregar mais..."];
    } 
    else 
    {
        Multa *multa = [self.multas objectAtIndex:indexPath.row];

        NSString *dataIsolada = [[NSString stringWithFormat:[multa dataOcorrencia]] substringWithRange:NSMakeRange(0, 10)];

        [[cell textLabel] setText:[NSString stringWithFormat:dataIsolada]];
        [[cell detailTextLabel] setText:[multa descricao]];
        [cell.imageView setImageWithURL:[NSURL URLWithString:[multa fotoURL]]
                       placeholderImage:[UIImage imageNamed:@"carregando.jpeg"]];
        [cell.imageView setContentMode: UIViewContentModeScaleAspectFit];
        [cell setAccessoryType:UITableViewCellAccessoryDetailDisclosureButton];
    }

    return cell;
}

当用户点击显示按钮时，我将显示按钮切换为 Activity Indicator，然后使用导航 Controller 将另一个 View 推送到屏幕:

- (void)carregarDetalhesMulta:(UITableView *)tableView comMulta:(Multa *)multa 
{
    DetalheMultaViewController *form = [[DetalheMultaViewController alloc] initWithMulta:multa];
    form.delegate = self;

    UINavigationController *navigation = [[UINavigationController alloc] initWithRootViewController:form];

    [self presentModalViewController:navigation animated:YES];
}

- (void) tableView: (UITableView *) tableView accessoryButtonTappedForRowWithIndexPath: (NSIndexPath *) indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleGray];
    spinner.frame = CGRectMake(0, 0, 24, 24);
    cell.accessoryView = spinner;
    [spinner startAnimating];

    Multa *multa = [self.multas objectAtIndex:indexPath.row];

    double delayInSeconds = 0.1;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);

    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){

       [spinner stopAnimating];
       [self carregarDetalhesMulta:tableView comMulta:multa];
       [cell setAccessoryType:UITableViewCellAccessoryDetailDisclosureButton];
    });

}

请注意，最后我已将披露按钮的配件改回。问题是:当我返回(通过点击返回按钮)到包含 UITableView 的 View 时，我点击的行没有显示披露按钮或事件指示器。我做错了什么？无需重新加载表格 View 即可切换这些控件的更好方法是什么？

Answer 1

accessoryView 属性优先于 accessoryType 属性。如果将 accessoryView 设置为 nil，您将再次看到附件按钮。