Instance Method


Asks the view if the gesture recognizer should be allowed to continue tracking touch events.


func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool



The gesture recognizer that is attempting to transition out of the UIGestureRecognizer.State.possible state.

Return Value

true if the gesture recognizer should continue tracking touch events and use them to trigger a gesture or false if it should transition to the UIGestureRecognizer.State.failed state.


Subclasses may override this method and use it to prevent the recognition of particular gestures. For example, the UISlider class uses this method to prevent swipes parallel to the slider’s travel direction and that start in the thumb.

At the time this method is called, the gesture recognizer is in the UIGestureRecognizer.State.possible state and thinks it has the events needed to move to the UIGestureRecognizer.State.began state.

The default implementation of this method returns true.

See Also

Managing Gesture Recognizers

func addGestureRecognizer(UIGestureRecognizer)

Attaches a gesture recognizer to the view.

func removeGestureRecognizer(UIGestureRecognizer)

Detaches a gesture recognizer from the receiving view.

var gestureRecognizers: [UIGestureRecognizer]?

The gesture-recognizer objects currently attached to the view.