如何检测UITableView清晰部分的点击？ [英] How to detect tap on clear part of UITableView?

问题描述

我有UITableView的视图控制器。表格视图的高度是静态的，==屏幕的高度。表中的行数可以更改，有时可能是行数小于可见行数的情况，因此在表底部会出现一些清晰区域。我可以在没有手势识别器的情况下检测到它吗？是否有一些UITableView的委托方法？

I have view controller with UITableView. Height of table view is static and == height of screen. Number of rows in table can change and sometimes it might be a situation when number of rows is less than number of rows which can be visible, so appears some clear area on bottom of table. Can i detect tap on it without gesture recognizer? Are there some delegate methods of UITableView?

推荐答案

是的，有委托方法，例如：

Yes, there are delegate methods, such as:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

但是，这只会告诉您是否在现有行上发生了点击。如果要捕获行（或部分标题）下方空白区域的点击，则需要使用手势识别器。你可以这样做：

However, this will only tell you if a tap occurs on an existing row. If you want to capture taps on the empty space below the rows (or on a section header) you will need to use a gesture recognizer. You can do something like this:

// in viewDidLoad or somewhere similar
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tableTapped:)];
[self.tableView addGestureRecognizer:tap];
//.........

- (void)tableTapped:(UITapGestureRecognizer *)tap
{
    CGPoint location = [tap locationInView:self.tableView];
    NSIndexPath *path = [self.tableView indexPathForRowAtPoint:location];

    if(path)
    {
        // tap was on existing row, so pass it to the delegate method
        [self tableView:self.tableView didSelectRowAtIndexPath:path];
    }
    else
    {
        // handle tap on empty space below existing rows however you want
    }
}

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编辑：对于替代方法，请考虑 Connor Neville的方法来自他对这篇文章的回答，并将手势识别器添加到桌子的背景中。

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for an alternative approach, consider Connor Neville's approach from his answer on this post and add the gesture recognizer to the table's background.

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