CODEWITHSUNDEEP
iosuiswipegesturerecognizer
Amir
Amir

Reputation: 139

iOS UIGestureRecognizer

I have two questions:

  1. Can I implement gesture recogniser that inherits from UISwipeGestureRecognizer and add logic to the UIEvent handlers?

  2. Can I implement UIGestureRecognizer without attaching it to a UIView? Meaning, I will analyze and manage the UIEvent events and call the proper selector (touchesBegan, touchesMoved, touchesEnded, touchesCancelled)?

In the meantime I have problems reseting the gesture recogniser when the state is UIGestureRecognizerStateEnded.

Upvotes: 1

Views: 322

Answers (1)

Rob
Rob

Reputation: 437392

You asked:

Can I implement gesture recogniser that inherits from UISwipeGestureRecognizer and add logic to the UIEvent handlers?

Yes. See Creating a Custom Gesture Recognizer in the Event Handling Guide for iOS. Also see WWDC 2010 session 121 - Advanced Gesture Recognition. It probably depends upon what you want to do, though, and you should see if you can accomplish what you want by configuring the standard swipe gesture's direction and numberOfTouches parameters. I've done more subclassing on continuous gestures like UIPanGestureRecognizer, but I see no reason why you couldn't do it on a swipe, too.

Can I implement UIGestureRecognizer without attaching it to a UIView? Meaning, I will analyze and manage the UIEvent events and call the proper selector (touchesBegan, touchesMoved, touchesEnded, touchesCancelled)?

No. Obviously you can create one, but it just won't receive any of the events until it's added to a UIView and that view receives touches.

In the meantime I have problems reseting the gesture recogniser when the state is UIGestureRecognizerStateEnded.

You'd have to submit a new question providing a relevant code snippet for us to help you on that one. In general, you'd do any post-gesture cleanup when your handler is called for UIGestureRecognizerStateEnded (and UIGestureRecognizerStateCancelled or UIGestureRecognizerStateFailed) and you'd initialize everything for the next gesture when you receive the next UIGestureRecognizerStateBegan.

Upvotes: 1

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