UITableView方法“indexPathForRowAtPoint：”的奇怪行为

如下面的代码所示，当tableview被拉伸（从不向上滚动）时，将始终调用NSLog(@"tap is not on the tableview cell") （ 因为我认为indexPath将始终为nil ）。 但是当我在节标题中点击大于2的NSLog中的头像时， NSLog不会被调用。 这很奇怪，有谁知道这里发生了什么？

 -(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section { ... UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)]; tapGesture.numberOfTapsRequired = 1; [avatar addGestureRecognizer:tapGesture]; //avatar is UIImageView and the user interaction is enabled. [headerView addSubview: aMessageAvatar]; return headerView; ... } -(void)handleTapGesture:(UITapGestureRecognizer *)sender { CGPoint point = [sender locationInView:self.tableView]; NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:point]; if (!indexPath) { NSLog(@"tap is not on the tableview cell"); } } 

Answer 1

您的点按位置是标题中的位置，而不是单元格，因此它永远不会匹配单元格indexPath 。

您可以将avatar视图的tag设置为viewForHeaderInSection的节号， handleTapGesture通过sender.view.tag检索viewForHeaderInSection的节号。 例如：

 -(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section { ... UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)]; tapGesture.numberOfTapsRequired = 1; avatar.tag = section; // save the section number in the tag avatar.userInteractionEnabled = YES; // and make sure to enable touches [avatar addGestureRecognizer:tapGesture]; //avatar is UIImageView and the user interaction is enabled. [headerView addSubview: aMessageAvatar]; return headerView; ... } -(void)handleTapGesture:(UITapGestureRecognizer *)sender { NSInteger section = sender.view.tag; NSLog(@"In section %d", section); }