DraggableView

DraggableView.playground

import UIKit
import PlaygroundSupport

final class ViewController: UIViewController {
    
    // Step 1
    lazy private var draggableView: UIView = {
        let view = UIView(frame: CGRect(origin: .zero, size: CGSize(width: 50, height: 50)))
        view.backgroundColor = .red
        return view
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Step 2
        draggableView.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(panGestureHandler(panGesture:))))
        view.addSubview(draggableView)
    }
    
    // Step 3:
    @objc
    private func panGestureHandler(panGesture recognizer: UIPanGestureRecognizer) {
        let location = recognizer.location(in: view)
        draggableView.center = location
    }
}

let viewController = ViewController()
PlaygroundPage.current.liveView = viewController
PlaygroundPage.current.needsIndefiniteExecution = true