带有 UIButton 的自定义 UITableViewCell:点击了哪个按钮? [英] Custom UITableViewCell with UIButton: which button has been clicked?

问题描述

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

我有一个带有部分和自定义 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];如果(单元格 == 零){NSArray* topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"CalendarEventCell" owner:nil options:nil];for(id currentObject in topLevelObjects){if ([currentObject isKindOfClass:[CalendarEventCell 类]]){单元格 = (CalendarEventCell *)currentObject;[cell.addToCalendarButton addTarget:self action:@selector(addEventToiCal) forControlEvents:UIControlEventTouchUpInside];休息;}}}...}

当用户触摸该按钮时，我如何知道点击的单元格位于哪个部分和行?

解决方案

在按钮上放置一个标签.例如:

CalendarEventCell* cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];如果(单元格 == 零){NSArray* topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"CalendarEventCell" owner:nil options:nil];for(id currentObject in topLevelObjects){if ([currentObject isKindOfClass:[CalendarEventCell 类]]){单元格 = (CalendarEventCell *)currentObject;[cell.addToCalendarButton addTarget:self action:@selector(addEventToiCal) forControlEvents:UIControlEventTouchUpInside];休息;}}}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.>

然后您可以向 -addEventToiCal:

添加类似以下内容的内容

if (!([sender isKindOfClass:[UIButton class]]))返回;NSUInteger 部分 = ((sender.tag >> 16) & 0xFFFF);NSUInteger 行 = (sender.tag & 0xFFFF);NSLog(@"第 %i 行第 %i 节中的按钮被按下.", section, row);

I'm developing an iOS 4 application with latest SDK and XCode 4.2.

I have a UITableView with sections and with custom UITableViewCell. Every cell has a UIButton and all of these buttons has the same target for UIControlEventTouchUpInside.

This is my code:

- (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;
            }
        }
    }
...
}

When user touch inside that button, how can I know on which section and row was the cell that has been clicked?

解决方案

Place a tag on the button. For example:

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);

You will need to change your selector to @selector(addEventToiCal:) and update the method to -(void) addEventToiCal:(UIButton *)sender.

You can then add something like the following to -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);

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