How to Write a Custom UIGestureRecognizer

Here’s a custom UIGestureRecognizer I’ve written to demonstrate recognizing continuous gestures.

It recognizes continuous press-drag gestures, a concept that is perhaps under-documented in Apple’s documentation.

The project includes an interface which on detecting a press-drag gesture, drops a red dot on the site of the press and updates the radius of a blue circle to coincide with where your finger is dragged to.

The PressDrag project page is available here. Have at it and feel free to fork it and send a pull request if you improve on it.