iphone - How do I get the coordinates for finger tapping in UIView?

Question

How do I get the coordinates for finger tapping in UIView? (I would prefer not to use a big array of buttons)

Thank you

Answer 1

There’re two ways to accomplish this. If you’ve already got a subclass of UIView that you’re using, you can just override the -touchesEnded:withEvent: method on that subclass, like this:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *aTouch = [touches anyObject];
    CGPoint point = [aTouch locationInView:self];
    // point.x and point.y have the coordinates of the touch
}

If you’re not already subclassing UIView, though, and the view is owned by a view controller or whatever, then you can use a UITapGestureRecognizer, like this:

// when the view's initially set up (in viewDidLoad, for example)
UITapGestureRecognizer *rec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRecognized:)];
[someView addGestureRecognizer:rec];
[rec release];

// elsewhere
- (void)tapRecognized:(UITapGestureRecognizer *)recognizer
{
    if(recognizer.state == UIGestureRecognizerStateRecognized)
    {
        CGPoint point = [recognizer locationInView:recognizer.view];
        // again, point.x and point.y have the coordinates
    }
}