How can I determine if a UILabel was touched?

Question

I am trying to determine if a UILabel was touched and if so do something. Give ..

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UILabel * site = [[UILabel alloc] initWithFrame:CGRectMake(0, 185, 320, 30)];
site.text = [retriever.plistDict valueForKey:@"url"];
site.textAlignment =UITextAlignmentCenter;
site.backgroundColor = [UIColor clearColor];
site.textColor = [UIColor whiteColor];
site.userInteractionEnabled = YES;
[theBgView addSubview:site];
[site release];
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Then I write the callback.

 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    retriever = [PListRetriever sharedInstance];
    CGPoint pt = [[touches anyObject] locationInView: self];
        NSURL *target = [[NSURL alloc] initWithString:[retriever.plistDict valueForKey:@"url"]];
        [[UIApplication sharedApplication] openURL:target];
  }

The problem is right now, no matter where I touch in the View the Url is being opened. How do I determine if only just my label was touched?

Answer 1

If you add the label to the class, you can do a hit-test on your view in the touch event with:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
  UITouch *touch = [[event allTouches] anyObject];
  if (CGRectContainsPoint([self.site frame], [touch locationInView:self.view]))
  {
    NSURL *target = [[NSURL alloc] ...];
    ...
  }
}

Also, don't forget to release the URL you allocate (otherwise you are leaking).

Answer 2

You could also add an invisible (not text or image) UIButton as a subview the same size as your label. This has the added benefit of not capturing other types of touches, such as a touch on another area of the screen that accidentally slides onto your label and then lifts up. It may also be considered cleaner code.