Question

I have a UIButton that when clicked starts searching for data. But while searching, if the user clicks on the button again it cancels the search.

Relevant Code:

    - (void)searchAction:(UIButton *)sender {

    [sender removeTarget:self action:@selector(searchAction:) forControlEvents:UIControlEventTouchUpInside];
    [sender addTarget:self action:@selector(cancelSearch:) forControlEvents:UIControlEventTouchUpInside];  
    [animatedImages startAnimating];
    //action that should be done

}

- (void)cancelSearch:(UIButton *)sender {
    [sender removeTarget:self action:@selector(cancelSearch:) forControlEvents:UIControlEventTouchUpInside];
    [sender addTarget:self action:@selector(searchNearbyAction:) forControlEvents:UIControlEventTouchDown];
    [animatedImages stopAnimating];

}

So the basic idea is that when i click on it its function change to cancel and vice-verca

The problem is that when I click on it the first time, it calls searchAction and then calls cancelSearch for no reason.

Does anyone know why this might be happening?

Answer 1

A workaround is to add a BOOL as an instance variable

BOOL canCancel;

and then do the following

- (void)buttonClicked:(UIButton *)sender {
      if (!canCancel) {
           // action that should be done
           canCancel = YES;
      } else if (canCancel) {
           // cancel action
           canCancel = NO;
      }
}