CODEWITHSUNDEEP
iosswiftuigesturerecognizersimultaneous
JoakimE
JoakimE

Reputation: 1864

Using gestureRecognizer: shouldRecognizeSimultaneouslyWithGestureRecognizer

I'm trying to detect up and down swipes simultaneously on my app. I have a SKScene and I'm adding the gesture recognizer in func didMoveToView: view I have set the delegate: UIGestureRecognizerDelegate, and have the following func all returning true.

gestureRecognizerShouldBegin: gestureRecognizer
gestureRecognizer: shouldRecognizeSimultaneouslyWithGestureRecognizer
gestureRecognizer: shouldReceiveTouch

When I swipe with one finger I can see that shouldRecognizeSimultaneouslyWithGestureRecognizer is fired and returning true. Func attached to the swipe is working also.

But when I try to swipe in both directions at the same time the corresponding func are not fired and shouldRecognizeSimultaneouslyWithGestureRecognizer are not fired.

The swipes are working great when I do them separately, but when simultaneously none swipes are executed.

What am I doing wrong here?

Edit: 

class GameControlller: SKScene, SKPhysicsContactDelegate, UIGestureRecognizerDelegate {}

Adding the swipes:

 override func didMoveToView(view: SKView) {
    print("did move to view")
    let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(GameControlller.PaddleMoveUp(_:)))
    swipeDown.direction = .Down
    self.view!.addGestureRecognizer(swipeDown)

    let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(GameControlller.PaddleMoveDown(_:)))
    swipeUp.direction = .Up
    self.view!.addGestureRecognizer(swipeUp)
    swipeDown.delegate = self
    swipeUp.delegate = self
}

The UIGestureRecognizer delegate func:

func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}


 func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    print("Simultaneous gesture recognizer!")
    return true
}
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
    return true
}

Upvotes: 1

Views: 2628

Answers (1)

xiaoming
xiaoming

Reputation: 130

I guess you forget set the delegate:

swipeUp.delegate = self
swipeDown.delegate = self

Upvotes: 1

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