UIGestureRecognizer in Swift Playgrounds - swift3

Question

I am trying to integrate UIGestureRecognizer into my swift playground so that wherever I tap in my playground, my sprite goes to that point. I've tried everything! Watching countless youtube videos, and going on stack overflow for answers but everyone starts with making a class called view that is a UIView and in their code they keep referring to "self". I instead made a variable named "view" that was a SKView. I try to get parts of their code, put it in mine, and change it, but it just doesn't work. Here's the work that I got so far.
view.addGestureRecognizer(UIGestureRecognizer(target: view, action: #selector(handleTap(sender:))))
func handleTap(sender: UITapGestureRecognizer) {
player.position = sender.location(in: view)
}
My playground keeps telling me that i'm using an unresolved identifier 'handleTap(sender:)'

Answer 1

UIGestureRecognizer example with different states of Gesture recogniser in Playground
swift3+
import UIKit
import PlaygroundSupport
class ViewController : UIViewController {
var yellowView: UIView!
var redView: UIView!
var yellowViewOrigin: CGPoint!
override func loadView() {
// UI
let view = UIView()
view.backgroundColor = .white
yellowView = UIView()
yellowView.backgroundColor = .yellow
view.addSubview(yellowView)
redView = UIView()
redView.backgroundColor = .red
view.addSubview(redView)
// Layout
redView.translatesAutoresizingMaskIntoConstraints = false
yellowView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
yellowView.topAnchor.constraint(equalTo: view.topAnchor, constant: 20.0),
yellowView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20.0),
yellowView.heightAnchor.constraint(equalToConstant: 80.0),
yellowView.widthAnchor.constraint(equalToConstant: 80.0),
redView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -20.0),
redView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20.0),
redView.heightAnchor.constraint(equalToConstant: 80.0),
redView.widthAnchor.constraint(equalToConstant: 80.0)
])
self.view = view
}
override func viewDidLoad() {
super.viewDidLoad()
let pan = UIPanGestureRecognizer(target: self, action: #selector(self.handlePanGesture(_:)))
yellowView.addGestureRecognizer(pan)
yellowViewOrigin = yellowView.frame.origin
view.bringSubview(toFront: yellowView)
}
#objc func handlePanGesture(_ sender: UIPanGestureRecognizer) {
let targetView = sender.view!
let translation = sender.translation(in: view)
switch sender.state {
case .began,.changed:
targetView.center = CGPoint(x: targetView.center.x + translation.x
,y: targetView.center.y + translation.y)
sender.setTranslation(CGPoint.zero, in: view)
case .ended:
if targetView.frame.intersects(redView.frame){
UIView.animate(withDuration: 0.3) {
targetView.alpha = 0.0
}
}
else{
UIView.animate(withDuration: 0.3) {
targetView.frame.origin = self.yellowViewOrigin
}
}
break
default:
break
}
}
}
PlaygroundPage.current.liveView = ViewController()

Answer 2

I think you need to add the #objc mark in front of the function declaration, so that handleTap will be visible to #selector.
#objc func handleTap(sender: UITapGestureRecognizer) {
player.position = sender.location(in: view)
}

Answer 3

func handleTap has to be called from your view type.
Please try to add it inside an SKView extension:
extension SKView {
func handleTap(sender: UITapGestureRecognizer) {
player.position = sender.location(in: view)
}
}