view.addSubview(: ) Not working in swift playgrounds - ios

Question

I've got a swift playground and I've created a UIButton called 'startButton'.
I have a function that sets up the parameters of the UIButton.
func setupStartButton() {
startButton.frame = CGRect(x: 15, y: 550, width: 125, height: 50)
startButton.backgroundColor = UIColor(ciColor: CIColor(red: 255/255, green: 0/255, blue: 77/255, alpha: 1.0))
startButton.layer.cornerRadius = 20
startButton.setTitle("Start", for: .normal)
startButton.setTitleColor(.white, for: .normal)
startButton.addTarget(self, action: #selector(startButtonPressed), for: .touchUpInside)
view.addSubview(startButton)
}
I call this in the viewDidLoad
override func viewDidLoad() {
let view = UIView(frame: CGRect(x: 0, y: 0, width: 524, height: 766))
view.backgroundColor = .white
setupStartButton()
PlaygroundPage.current.liveView = view
PlaygroundPage.current.needsIndefiniteExecution = true
}
When I run the playground it doesn't show the button.
How do I show the button.
Thank you

Answer 1

You are setting PlaygroundPage.current.liveView to the local view created in viewDidLoad. This is not the same view of the view controller which is what you are adding the button to in the setupStartButton.
I would remove the line let view = UIView(frame: CGRect(x: 0, y: 0, width: 524, height: 766)) then every reference to view will be the view controller's view.
You should remove the playground code from the viewDidLoad method. After the view controller class, you can create an instance of the view controller and setup the playground:
Something like:
class MyViewController: UIViewController {
// your code
}
PlaygroundPage.current.liveView = MyViewController()