Running swift condition just once on translation - ios

Question

I created a UIView and a UIImageView which is inside the UIView as a subview, then I added a pan gesture to the UIImageView to slide within the UIView, the image slides now but the problem I have now is when the slider gets to the end of the view if movex > xMax, I want to print this just once print("SWIPPERD movex"). The current code I have there continues to print print("SWIPPERD movex") as long as the user does not remove his/her hand from the UIImageView which is used to slide
private func swipeFunc() {
let swipeGesture = UIPanGestureRecognizer(target: self, action: #selector(acknowledgeSwiped(sender:)))
sliderImage.addGestureRecognizer(swipeGesture)
swipeGesture.delegate = self as? UIGestureRecognizerDelegate
}
#objc func acknowledgeSwiped(sender: UIPanGestureRecognizer) {
if let sliderView = sender.view {
let translation = sender.translation(in: self.baseView) //self.sliderView
switch sender.state {
case .began:
startingFrame = sliderImage.frame
viewCenter = baseView.center
fallthrough
case .changed:
if let startFrame = startingFrame {
var movex = translation.x
if movex < -startFrame.origin.x {
movex = -startFrame.origin.x
print("SWIPPERD minmax")
}
let xMax = self.baseView.frame.width - startFrame.origin.x - startFrame.width - 15 //self.sliderView
if movex > xMax {
movex = xMax
print("SWIPPERD movex")
}
var movey = translation.y
if movey < -startFrame.origin.y { movey = -startFrame.origin.y }
let yMax = self.baseView.frame.height - startFrame.origin.y - startFrame.height //self.sliderView
if movey > yMax {
movey = yMax
// print("SWIPPERD min")
}
sliderView.transform = CGAffineTransform(translationX: movex, y: movey)
}
default: // .ended and others:
UIView.animate(withDuration: 0.1, animations: {
sliderView.transform = CGAffineTransform.identity
})
}
}
}
override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
return sliderImage.frame.contains(point)
}

Answer 1

You may want to use the .ended state instead of .changed state, based on your requirements. And you've mentioned you want to get the right direction only. You could try below to determine if the swipe came from right to left, or vice-versa, change as you wish:
let velocity = sender.velocity(in: sender.view)
let rightToLeftSwipe = velocity.x < 0