CODEWITHSUNDEEP
iosswiftuipangesturerecognizer
Jeremy Andrews
Jeremy Andrews

Reputation: 837

Is it possible using a UIPanGestureRecognizer to drag a top view to the right to expose a sub-view

I need to drag my to view about 2/3 part of a screen width to the right to expose a sub-view (containing a tableview) and then drag it back after inter-acting with the tableview.

The UIPanGestureRecognizer seems to be what I need but after reading Apple's documentation I can't figure out the code needed in swift.

So to clarify - I have a view for capturing user data and I have a tableview that contains telephone labels and numbers - I want to be able to drag the user view, expose the table and then drag the user view back.

@IBAction func panPiece(_ gestureRecognizer : UIPanGestureRecognizer) {
    // Move the anchor point of the view's layer to the touch point
    // so that moving the view becomes simpler.
    let piece = gestureRecognizer.view
    self.adjustAnchorPoint(gestureRecognizer: gestureRecognizer)

    if gestureRecognizer.state == .began || gestureRecognizer.state == .changed {
        // Get the distance moved since the last call to this method.
        let translation = gestureRecognizer.translation(in: piece?.superview)

        // Set the translation point to zero so that the translation distance
        // is only the change since the last call to this method.
        piece?.center = CGPoint(x: ((piece?.center.x)! + translation.x),
                                y: ((piece?.center.y)! + translation.y))
        gestureRecognizer.setTranslation(CGPoint.zero, in: piece?.superview)
    }
}
func adjustAnchorPoint(gestureRecognizer : UIGestureRecognizer) {
    if gestureRecognizer.state == .began {
        let view = gestureRecognizer.view
        let locationInView = gestureRecognizer.location(in: view)
        let locationInSuperview = gestureRecognizer.location(in: view?.superview)

        // Move the anchor point to the touch point and change the position of the view
        view?.layer.anchorPoint = CGPoint(x: (locationInView.x / (view?.bounds.size.width)!),
                                          y: (locationInView.y / (view?.bounds.size.height)!))
        view?.center = locationInSuperview
    }
}

Upvotes: 1

Views: 988

Answers (1)

jegadeesh
jegadeesh

Reputation: 945

For attaching a gesture with a view 

 let panGesture = UIPanGestureRecognizer(target: self, action:#selector(handlePanGesture))
 @objc private func handlePanGesture(sender:UIPanGestureRecognizer)
 {
     var translation = sender.translation(in: self)
     sender.view?.superview?.bringSubview(toFront: sender.view!)
     sender.view?.center = CGPoint(x: (sender.view?.center.x)! + translation.x , y : (sender.view?.center.y)! + translation.y)
     sender.setTranslation(CGPoint.zero, in: self)
 }

Upvotes: 1

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