CODEWITHSUNDEEP
iosswiftuiviewuigesturerecognizeruipangesturerecognizer
Deepak Sharma
Deepak Sharma

Reputation: 6477

UIView pan Gesture conflict with system gesture

I am installing a UIPanGestureRecognizer on the main view as follows:

  panGesture = UIPanGestureRecognizer(target: self, action: #selector(previewPanned(_:))
  panGesture?.minimumNumberOfTouches = 1
  panGesture?.maximumNumberOfTouches = 1               
  view.addGestureRecognizer(panGesture!)

The problem is it gets simultaneously recognised with the system swipe gesture on home indicator to dismiss the app. How do I avoid this conflict?

EDIT: The problem arises when I dimmed home button indicator using the following code - 

   override var prefersHomeIndicatorAutoHidden: Bool {
      return false
   }

   override var preferredScreenEdgesDeferringSystemGestures: UIRectEdge {
       return [.bottom, .top]
   }

The above code dims the home indicator after few seconds. Then you need to swipe twice to dismiss the app -- the first one to undim the home indicator and the second one to dismiss the app. The first swipe does both, invokes my pan gesture recognizer as well as undims the home indicator. I don't want my pan gesture recognizer to be called during the first swipe.

Upvotes: 1

Views: 803

Answers (1)

Phil Dukhov
Phil Dukhov

Reputation: 87774

If I understood you correctly, you don't want your recognizer to work near home indicator, so you have two options:

  1. Create a view specifically for this recognized and layout its bottom to the safe layout guide.

  2. Implement a gesture recognizer delegate method shouldReceive touch: and check if the touch is in the save bounds:

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
    let safeAreaFrame = view.bounds.inset(by: view.safeAreaInsets)
    return safeAreaFrame.contains(touch.location(in: view))
}

Second case is implemented in the following sample project

Upvotes: 3

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