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Asked: 2026-05-23T16:59:16+00:00

I want to detect scroll gestures (two fingers on trackpad). How should i do

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I want to detect scroll gestures (two fingers on trackpad).
How should i do that?

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1 Answer

  1. Editorial Team

    You should do that by implementing touch event methods of NSView in your custom subclass.
    These methods are :

    - (void)touchesBeganWithEvent:(NSEvent *)event;
- (void)touchesMovedWithEvent:(NSEvent *)event;
- (void)touchesEndedWithEvent:(NSEvent *)event;
- (void)touchesCancelledWithEvent:(NSEvent *)event;

    The NSEvent object coming along as a paramter contains informations about the touches involded. In particular, you may retrieve them using :

    -(NSSet *)touchesMatchingPhase:(NSTouchPhase)phase inView:(NSView *)view;

    Also, in the custom view subclass, you must first set it like this :

    [self setAcceptsTouchEvents:YES];

    in order to recieve such events.

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