ios - 带有 UIButton : which button has been clicked? 的自定义 UITableViewCell

Question

我正在使用最新的 SDK 和 XCode 4.2 开发 iOS 4 应用程序。

我有一个包含部分和自定义 UITableViewCell 的 UITableView。每个单元格都有一个 UIButton，所有这些按钮都有相同的 UIControlEventTouchUpInside 目标。

这是我的代码:

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

    CalendarEventCell* cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell == nil)
    {
        NSArray* topLevelObjects =  [[NSBundle mainBundle] loadNibNamed:@"CalendarEventCell" owner:nil options:nil];

        for(id currentObject in topLevelObjects)
        {
            if ([currentObject isKindOfClass:[CalendarEventCell class]])
            {
                cell = (CalendarEventCell *)currentObject;
                [cell.addToCalendarButton addTarget:self action:@selector(addEventToiCal) forControlEvents:UIControlEventTouchUpInside];
                break;
            }
        }
    }
...
}

当用户触摸该按钮内部时，我如何知道被点击的单元格是在哪个部分和行？

Answer 1

在按钮上放置一个标签。例如:

CalendarEventCell* cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

if (cell == nil)
{
    NSArray* topLevelObjects =  [[NSBundle mainBundle] loadNibNamed:@"CalendarEventCell" owner:nil options:nil];

    for(id currentObject in topLevelObjects)
    {
        if ([currentObject isKindOfClass:[CalendarEventCell class]])
        {
            cell = (CalendarEventCell *)currentObject;
            [cell.addToCalendarButton addTarget:self action:@selector(addEventToiCal) forControlEvents:UIControlEventTouchUpInside];
            break;
        }
    }
}
cell.addToCalendarButton.tag = ((indexPath.section & 0xFFFF) << 16) |
                               (indexPath.row & 0xFFFF);

您需要将选择器更改为 @selector(addEventToiCal:)并将方法更新为 -(void) addEventToiCal:(UIButton *)sender .

然后您可以将类似以下内容添加到 -addEventToiCal:

if (!([sender isKindOfClass:[UIButton class]]))
    return;
NSUInteger section = ((sender.tag >> 16) & 0xFFFF);
NSUInteger row     = (sender.tag & 0xFFFF);
NSLog(@"Button in section %i on row %i was pressed.", section, row);