More on UIGestureRecognizer
You have only scratched the surface of UIGestureRecognizer. There are more subclasses, more properties, and more delegate methods, and you can even create recognizers of your own. This section will give you an idea of what UIGestureRecognizer is capable of. You can study the documentation to learn even more.
When a gesture recognizer is on a view, it is really handling all of the UIResponder methods, like touchesBegan(_:withEvent:), for you. Gesture recognizers are pretty greedy, so they typically do not let a view receive touch events or they at least delay the delivery of those events. You can set properties on the recognizer, like delaysTouchesBegan, delaysTouchesEnded, and cancelsTouchesInView, to change ...
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