如何检测 UITableViewCells 之外的 UITableView 上的点击 - 即在部分标题中? [英] How do I detect taps on a UITableView outside of UITableViewCells - i.e. in the section heading?

问题描述

我想在不包括单元格的 UITableView 中处理点击.换句话说，就是页眉和页脚.

I want to handle a tap in a UITableView not including the cells. In other words, the headers and footers.

我可以向页眉添加手势识别器(没有页脚)，但最后一节底部的空间不会响应点击.

I can add a gesture recognizer to the headers (there are no footers), but the space at the bottom of the last section does not respond to a tap.

我没有添加上面的手势识别器，而是尝试向表中添加手势识别器，但它阻止了 tableView:didSelectRowAtIndexPath: 被调用.

Instead of adding the gesture recognizers above, I tried adding a gesture recognizer to the table, but it prevents tableView:didSelectRowAtIndexPath: being called.

我尝试了各种 UIGestureRecognizerDelegate 调用，但运气不佳.

I tried all sorts of UIGestureRecognizerDelegate calls with not much luck.

我终于通过在识别器上设置 cancelsTouchesInView = NO(我认为这是秘密)并在委托中实现 gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: 来实现这一点，以便tableView 接触并调用 tableView:didSelectRowAtIndexPath:

I finally got that to work by setting cancelsTouchesInView = NO on the recognizer (I think this was the secret) and implementing gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: in the delegate so that the tableView got touches and called tableView:didSelectRowAtIndexPath:

处理程序必须过滤掉单元格上的点击，但至少它可以工作.(另外，在 UITableView indexPathForRowAtPoint:point 中发现了一个错误，有时会返回无效的 indexPaths.)

The handler has to filter out taps on the cells, but at least it works. (Also, found a bug in UITableView indexPathForRowAtPoint:point which returns invalid indexPaths sometimes.)

我的问题是:是否有更好的方法来获取单元格视图以防止触摸/手势进入表格?(如果没有人给我更好的想法，我会发布代码.)

My question is: Is there a better way of getting the cell views to prevent touches/gestures getting through to the table? (I will post code if nobody gives me any better ideas.)

推荐答案

这是我使用的代码.

1 向表格添加点击手势识别器.取消选中取消视图中的触摸.

1 Add a tap gesture recognizer to the table. Set Cancels touches in view unchecked.

2 允许手势穿过桌子.

#pragma mark - UIGestureRecognizerDelegate

/**
 * Prevents the tap gesture recognizer in the table from gobbling taps
 * and allows the table to perform tableView:didSelectRowAtIndexPath:
 * <p>
 * The gesture recognizer must have cancelsTouchesInView == NO to allow
 * the touches through to the table.
 * <p>
 * The action must check that the tap occurred outside of cells.
 *
 * @see handleTap:
 */
- (BOOL) gestureRecognizer:(UIGestureRecognizer*)recognizer
  shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer*)o {
    return recognizer.view == self.table;
}

3 检查水龙头不在单元格中.

3 Check the tap is not in a cell.

/**
 * Filters a tap on the table to those on the headers/footer.
 * <p>
 * Note, indexPathForRowAtPoint: has a bug and returns valid indexPaths
 * for taps in the last section header and table footer. So an extra
 * check is made to ensure that the tap was, in fact, in the cell.
 */
- (IBAction) handleTap:(UITapGestureRecognizer*)tap {
    if (UIGestureRecognizerStateEnded == tap.state) {
        CGPoint point = [tap locationInView:tap.view];
        NSIndexPath* index = [self.table indexPathForRowAtPoint:point];
        UITableViewCell* cell;

        if (index) {
            cell = [self.table cellForRowAtIndexPath:index];
            point = [tap locationInView:cell];

            if (point.y < 0 || point.y >= cell.frame.size.height) {
                index = nil;
            }
        }

        if (!index) {
            [self.view performSelector:@selector(endEditing:)
                            withObject:@(YES) afterDelay:0];
        }
    }
}

这篇关于如何检测 UITableViewCells 之外的 UITableView 上的点击 - 即在部分标题中?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！