PlaygroundでパッとViewだすやつ

playground-snippet.swift

//: Playground - noun: a place where people can play

import UIKit
import PlaygroundSupport

let viewController = UIViewController()
viewController.view.backgroundColor = UIColor.white
let navigationController = UINavigationController(rootViewController: viewController)
navigationController.view.frame = CGRect(x: 0, y: 0, width: 320, height: 569)

let label = UILabel(frame: CGRect(x: 0, y: 50, width: 300, height: 100))
label.text = "hoge"
viewController.view.addSubview(label)

PlaygroundPage.current.needsIndefiniteExecution = true
PlaygroundPage.current.liveView = navigationController.view