Question

I’d like to implement a gesture recognizer (swipe action) for a button. The problem is, the buttons are create programmatically and are or aren’t existent based on a few conditions. So, I don’t know if there are buttons, or how many.

I know I need something like:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if (touch.view == aButtonView) {
        //get the button's tag
    }
}

Of course, the if-statement should return Yes when any button view is pressed…

Anyone has any idea on what the word aButtonView should be? Or if it’s even possible? Thanks in advance.

Answer 1

You should think about using UISwipeGestureRecognizer instances. Attach the gesture recognizer to the button objects –

UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self
                                                                            action:@selector(handleSwipe:)];
swipe.direction = UISwipeGestureRecognizerDirectionUp;
[button addGestureRecognizer:swipe];
[swipe release];

and in handleSwipe:

- (void) handleSwipe:(UISwipeGestureRecognizer *)swipe {
    NSInteger tag = swipe.view.tag;
}

---

it should be if ( [gestureRecognizer.view isKindOfClass:[UIButton class]] ) {