CODEWITHSUNDEEP
swiftuiviewuicolor
RyBac
RyBac

Reputation: 79

why isn't my background color changing for my view in swift?

I am trying to change my background color for my view programmatically because later on I will have to switch the color based on user input. I have no idea why this wont change the background color.

class MainViewController: UIViewController {

  @IBOutlet weak var rLabel: UILabel!
  @IBOutlet weak var gLabel: UILabel!
  @IBOutlet weak var bLabel: UILabel!
  @IBOutlet weak var largeColorView: UIView!



 override func viewDidLoad() {
    super.viewDidLoad()
    func colorWithAlphaComponent(alpha: CGFloat) -> UIColor{
      let newColor = UIColor.init(red: 0.5, green: 0.8, blue: 1.0, alpha: alpha)
      return newColor
    }
    print(largeColorView.backgroundColor)
    print(colorWithAlphaComponent(1.0))
    largeColorView.backgroundColor! = colorWithAlphaComponent(1.0)
    print(largeColorView.backgroundColor)

    // Do any additional setup after loading the view.
  }

Upvotes: 0

Views: 1107

Answers (1)

Lamour
Lamour

Reputation: 3030

First mistake : you have to implement the function outside of the the viewDidLoad() method but you call of it. Therefore your code should like this :

override func viewDidLoad() {
    super.viewDidLoad()
    print(largeColorView.backgroundColor)
    print(colorWithAlphaComponent(1.0))
    largeColorView.backgroundColor! = colorWithAlphaComponent(1.0)
    print(largeColorView.backgroundColor)
  }

func colorWithAlphaComponent(alpha: CGFloat) -> UIColor{
  let newColor = UIColor.init(red: 0.5, green: 0.8, blue: 1.0, alpha: alpha)
  return newColor
}

Therefore this line of code will run because it call the function

largeColorView.backgroundColor! = colorWithAlphaComponent(1.0)

Upvotes: 1

Related Questions