Question

Question:

I’m trying to change the background color of a view using UITapGestureRecognizer. Essentially when the user taps, I want the background to change colors, and on release or complete, the background color go back to nil, or no background color.

This action is similar to a default UIButton, but I need this to be on a view instead.

Problem:

I’ve tried using code similar to:

- (void)handleTapGesture:(UITapGestureRecognizer *)recognizer
{
        if(recognizer.state == UIGestureRecognizerStateBegan) {
            self.backgroundColor = [UIColor greenColor];
        }
        
        if(recognizer.state == UIGestureRecognizerStateEnded) {
            self.backgroundColor = nil;
        }
}

without any sucess. Is this the correct way to know when a tap gesture starts and ends?

Answer 1

It might be easier to use these methods which should already be part of the responder chain in your UIViewController, unless they are being handled elsewhere already

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {    
    //CGPoint touchPoint = [[touches anyObject] locationInView:self.view];
    NSLog(@"began");
}

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    //CGPoint touchPoint = [[touches anyObject] locationInView:self.view];
    NSLog(@"end");
}