title: Swift iOS playground: Error sending deferral props
body: <p>With an iOS playground set up as simply as this:</p>
  
  <pre><code>import UIKit
  import SpriteKit
  import XCPlayground
  
  let s = CGSize(width: 300, height: 300)
  let f = CGRect(origin: CGPointZero, size: s)
  let view = SKView(frame: f)
  let scene = SKScene(size: s)
  scene.backgroundColor = SKColor.redColor()
  view.presentScene(scene)
  XCPShowView("main view", view)
  </code></pre>
  
  <p>I'm getting this in the console:</p>
  
  <pre><code>2014-09-04 17:02:13.358 SpriteKitBETA7[2009:20695] Error sending deferral props: 0x10000003
  </code></pre>
  
  <p>There IS a "main view" box in the Assistant Editor thing, but it doesn't display anything. This exact same code (with <code>import Cocoa</code> instead of <code>import UIKit</code>) works perfectly on an OSX playground.
  I am aware I can just test stuff in an OSX playground (though it would be more convenient on an iOS one since I don't want to use Yosemite but I do have the iOS7 SDK) and copy-paste to my project, but I wanted to know if anyone understood what's happening here.</p>