title: Why does Xcode Playground execute liveView through iPad-like Simulator?
body: <p><a href="https://i.stack.imgur.com/nbmpk.png" rel="noreferrer"><img src="https://i.stack.imgur.com/nbmpk.png" alt="enter image description here"></a></p>
  
  <p>I'm trying some codes in Xcode 8.2.1 Playground with Swift 3.<br>
  I've been confused since <code>PlaygroundPage.current.liveView</code> executes iPad-like simulator.<br>
  I want to test keyboard input through a simulator of smaller device. Can I handle this better?</p>
  
  <pre><code>import UIKit
  
  class ViewController: UIViewController {
  
      override func viewDidLoad() {
          super.viewDidLoad()
          setupTextView()
      }
  
      private func setupTextView() {
          let textView = UITextView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height))
          textView.backgroundColor = .gray
          textView.isSelectable = true
          textView.font = textView.font?.withSize(20)
          view.addSubview(textView)
      }
  
  }
  
  let viewController = ViewController()
  let window = UIWindow(frame: CGRect(x: 0, y: 0, width: 640, height: 600))
  window.rootViewController = viewController
  window.makeKeyAndVisible()
  
  import PlaygroundSupport
  
  PlaygroundPage.current.liveView = window
  PlaygroundPage.current.needsIndefiniteExecution = true
  </code></pre>