xcodeliveview.playground

import UIKit
import PlaygroundSupport

class ViewController : UIViewController {
    
    override func loadView() {
        
        let view = UIView()
        view.backgroundColor = .white
        
        let box = UIView()
        box.frame = CGRect(x: 0, y: 0, width: 100, height: 100)
        box.backgroundColor = .blue
        view.addSubview(box)
        
        self.view = view
    }
    
}
PlaygroundPage.current.needsIndefiniteExecution = false
PlaygroundPage.current.liveView = ViewController()