fullplaygroundpan

fullplaygroundpan

import UIKit
import PlaygroundSupport

class MyViewController: UIViewController {
    
    let clickableView = UIView()
    
    override func loadView() {
        let view = UIView()
        view.backgroundColor = .lightGray
                
        clickableView.backgroundColor = .blue
        
        view.addSubview(clickableView)

        clickableView.translatesAutoresizingMaskIntoConstraints = false
        clickableView.widthAnchor.constraint(equalToConstant: 200).isActive = true
        clickableView.heightAnchor.constraint(equalToConstant: 200).isActive = true
        clickableView.centerYAnchor.constraint(equalTo:view.centerYAnchor).isActive = true
        clickableView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        self.view = view
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
        clickableView.addGestureRecognizer(pan)
    }
    
    @objc func handlePan(_ sender: UIPanGestureRecognizer) {
        let targetView = sender.view!
        let translation = sender.translation(in: view)

        switch sender.state {
        case .began,.changed, .ended:
            targetView.center = CGPoint(x: targetView.center.x + translation.x
                ,y: targetView.center.y + translation.y)
            sender.setTranslation(CGPoint.zero, in: view)

            break
        default:
            break
        }
    }
}

PlaygroundPage.current.liveView = MyViewController()