Check if Recognizer already added.
| /// Example adding it the first time | |
| let recognizer = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:))) | |
| view.addGestureRecognizer(recognizer) | |
| /// Test if gesture already added, if added return else add the recognizer | |
| guard containsGestureRecognizer(recognizers: view.gestureRecognizers, find: recognizer) == false else { return } | |
| /// Add the recognizer | |
| view.addGestureRecognizer(recognizer) |
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