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不在tableview单元格上”)(因为我认为indexPath将始终为nil).但是当我点击截面编号大于2的节标题中的头像时,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");
}
}
最佳答案 您的点击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.
您可以将头像视图的标记设置为viewForHeaderInSection中的节号,然后通过sender.view.tag检索handleTapGesture中的节号.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);
}