Swift: UIPanGesture get location horizontally of view - ios

Question

ja a gesture that is on the view that vertical black in the photo.
I want to know its location at the level of the screen, because I want to execute a function if for example I slide the view to the right at more than half of the center of the screen
code:
#objc func detectPan(recognizer: UIPanGestureRecognizer) {
switch recognizer.state {
case .began:
self.startingConstant = self.centerConstraint.constant
case .changed:
let translation = recognizer.translation(in: self.view)
self.centerConstraint.constant = self.startingConstant - translation.x
default:
break
}
}
Fist image
Second image

Answer 1

You can convert coordinates (points and frames) between views as long as they are on the same hierarchy. You have two methods convert(:to:) and convert(:from:).
In your case you seem to want to convert location in your view to screen which is your key window UIApplication.shared.keyWindow.
So in general the point on screen is let pointOnScreen = myView.convert(pointInMyView, to: UIApplication.shared.keyWindow).
So in your case:
let myView = self.view
let pointInMyView = recognizer.locationInView(myView)
let pointOnScreen = myView.convert(pointInMyView, to: UIApplication.shared.keyWindow)
let isViewGestureOnRightSideOfTheScreen = pointOnScreen.x > UIApplication.shared.keyWindow!.frame.midX

Answer 2

you can get point via
func transform(for translation : CGPoint) -> CGAffineTransform {
let moveBy = CGAffineTransform(translationX: translation.x, y: translation.y)
return moveBy
}
#IBAction func setPanGesture(_ sender: UIPanGestureRecognizer) {
switch sender.state {
case .changed:
let translation = sender.translation(in: view)
let translationView = transform(for: translation)
print(translationView)
case .ended:
let translation = sender.translation(in: view)
let translationView = transform(for: translation)
print(translationView)
default:
break
}
}