Question

I have two labels in two different positions, when both labels are tapped at the same time i want another label to show a success message.

How do I accomplish this? I can recognize a single tap or double tap with one or more finger touches but this is a different scenario. Please help. I tried this, but it does not work.

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
        tapRecognizer.numberOfTapsRequired = 1;
        tapRecognizer.numberOfTouchesRequired = 2;
        tapRecognizer.delegate = self;
        [self.view addGestureRecognizer:tapRecognizer];

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    if (touch.view == tap2 && touch.view == tap1)
    {
        result.text = @"success";
    }
    return YES;
}

Thanks in advance.

Answer 1

Formally I had accepted termes’s answer first and that worked too, but I have found a more simpler solution to this process. There is no need for two gesture recognizers, it is achievable with a simple tap gesture recognizer with number of touches count to two. Here is the code:

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
    tapRecognizer.numberOfTapsRequired = 1;
    tapRecognizer.numberOfTouchesRequired = 2;
    tapRecognizer.delegate = self;
    [self addGestureRecognizer:tapRecognizer];

Now, in the handle tap method we can easily get the two touch points by “locationOfTouch:inView:“, a instance method of UIGestureRecognizer class. So in the handleTap: method we need to check if the two touch points are in the desired location. Here is the code:

-(void)handleTap:(UITapGestureRecognizer*)recognizer
{
    if (recognizer.state == UIGestureRecognizerStateEnded)
    {
        CGPoint point1 = [recognizer locationOfTouch:0 self];
        CGPoint point2 = [recognizer locationOfTouch:1 self];

        if ([self validateTapIn:point1 and:point2])
        {
            resultLabel.text = @"success";
        }
    }
}

-(BOOL)validateTapIn:(CGPoint)point1 and:(CGPoint)point2
{
    return
    (CGRectContainsPoint(label1.frame, point1) && CGRectContainsPoint(label2.frame,:point2)) ||
    (CGRectContainsPoint(label1.frame, point2) && CGRectContainsPoint(label2.frame, point1));
}