Add a gesture recognizer to tableView header doesn't work? - ios

Question

I know that a "table view header"(the most top-part of a table view) is a View
So I try to add a UITapGestureRecognizer to it ,but it doesn't work...
code is simple :
- (void)tap:(UITapGestureRecognizer *)recognizer
{
// do something
}
UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tap:)];
[self.tableView.tableHeaderView addGestureRecognizer:recognizer];
Any tips here to care ? thanks a lot

Answer 1

Here's the thing that works for me:
Instead adding this:
self.tableView.tableHeaderView
I add gesture recognizer on every UILabel on tableview.
-(UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
UILabel *headerLabel = [[UILabel alloc]init];
headerLabel.tag = section;
headerLabel.userInteractionEnabled = YES;
headerLabel.backgroundColor = [UIColor greenColor];
headerLabel.text = [NSString stringWithFormat:#"Header No.%d",section];
headerLabel.frame = CGRectMake(0, 0, tableView.tableHeaderView.frame.size.width, tableView.tableHeaderView.frame.size.height);
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:#selector(catchHeaderGesture:)];
tapGesture.cancelsTouchesInView = NO;
[headerLabel addGestureRecognizer:tapGesture];
return headerLabel;
//return nil;
}
-(void)catchHeaderGesture:(UIGestureRecognizer*)sender
{
UILabel *caughtLabel = (UILabel*)sender.view;
NSLog(#"header no : %d", caughtLabel.tag);
}
I hope that helps.

Answer 2

First of all
Make sure that you call this code section in viewDidLoad or viewWillAppear
UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tap:)];
[self.tableView.tableHeaderView addGestureRecognizer:recognizer];
Second, please make sure that
self.tableView.tableHeaderView
is not null, add
NSLog([self.tableView.tableHeaderView description]);
And check the console for output
I just tried your code and the tap was recieved correctly