moving imageView from current location to tap location at a constant speed - ios

Question

I have a an imageView that I want to move prom current location to tapped location at a constant speed, regardless of distance.
tried the following which doesn't really work and I don't really know how to keep animation duration dynamic according to distance that imageView needs to traverse.
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
let position = touch.location(in: self.view)
print(position.x)
print(position.y)
CATransaction.begin()
CATransaction.setCompletionBlock { () -> Void in
self.imageView.layer.position = (self.imageView.layer.presentation()?.position)!
}
var animation = CABasicAnimation(keyPath: "position")
animation.duration = 2
var currentPosition : CGPoint = imageView.layer.presentation()!.position
animation.fromValue = NSValue(currentPosition)
animation.toValue = NSValue(CGPoint: position.x, (position.y))
animation.isRemovedOnCompletion = false
animation.fillMode = kCAFillModeForwards
imageView.layer.add(animation, forKey: "transform")
CATransaction.commit()
}
}

Answer 1

Try with this
calculating the distance
func distance(_ a: CGPoint, _ b: CGPoint) -> CGFloat {
let xDist = a.x - b.x
let yDist = a.y - b.y
return CGFloat(sqrt((xDist * xDist) + (yDist * yDist)))
}
and then using a arbitrary velocity, and calculating the time
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
let position = touch.location(in: self.view)
print(position.x)
print(position.y)
let distance = Double(self.distance(self.imageView.center, position))
let velocity = 100.0 //pixels by seconds
let time = distance / velocity
UIView.animate(withDuration: time, animations: {
self.imageView.center = position
})
}
}

Answer 2

You can add UITapGestureRecognizer of imageView parent view and create tap gesture action
#IBAction func tapGesture(_ sender: UITapGestureRecognizer) {
print("tap working")
if sender.state == UIGestureRecognizerState.recognized
{
let location = sender.location(in: sender.view)
print(location)
UIView.animate(withDuration: 0.5, animations: {
self.imageView.center = location
})
}
}