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I would appreciate knowing the limitations the iPad Swift Playgrounds app imposes. For example I was surprised to find that I got a runtime error when I tried to create more than five sub views. Playing with UILabels to present a form is very limiting!This is the code I used:import UIKitimport PlaygroundSupportclass MyViewController : UIViewController { let square50 = CGSize(width: 50, height: 50) override func viewDidLoad() { var myFrame = CGRect(origin: .zero, size: square50) for index in 0...4 { view.addSubview(UIView(frame: myFrame)) // fails at 6th! (view.subviews[index] as! UIView).backgroundColor = .red myFrame.origin.y += 80 } }}PlaygroundPage.current.liveView = MyViewController()