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iOS Intermediate Swift Properties Property Observers

what is the correct answer to property observer code challenge for Xcode, in editor my code works fine

import PlaygroundSupport import UIKit

class TemperatureController: UIViewController { var temperature: Double = 0.0 { didSet { if (temperature > 80.0) { view.backgroundColor = .red } else if (temperature < 40.0) { view.backgroundColor = .blue } else { view.backgroundColor = .green } } }

init(temperature: Double) {
    self.temperature = temperature
    super.init(nibName: nil, bundle: nil)
}
convenience init(){
    self.init(temperature: 0)
}




required  init?(coder aDecoder: NSCoder) {

super.init(coder: aDecoder)

}


override func  viewDidLoad() {
     super.viewDidLoad()
    view.backgroundColor = .green
}

}

var tempController = TemperatureController(temperature: 90.0) PlaygroundPage.current.liveView = tempController.view

observer.swift
class TemperatureController: UIViewController {
    var temperature: Double

    init(temperature: Double) {
        self.temperature = temperature
        super.init()
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
    }
}