UIActivityIndicatorView not showing up in iOS UIViewController

Question

I want to display a gray UIViewIndicatorView in a view controller at the center of the view but this piece of code isn't showing anything:

class MyViewController: UIViewController {
    var activityIndicatorView = UIActivityIndicatorView()

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

    func displayActivityIndicator() {
        view.addSubview(activityIndicatorView)
        activityIndicatorView.style = .gray
        activityIndicatorView.translatesAutoresizingMaskIntoConstraints = false
        activityIndicatorView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        activityIndicatorView.widthAnchor.constraint(equalToConstant: 40).isActive = true
        activityIndicatorView.heightAnchor.constraint(equalToConstant: 40).isActive = true
        activityIndicatorView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        activityIndicatorView.startAnimating()
    }   
}

This only shows up the activity indicator view when I set the view controller's view to a color like white (excluding black).

How can I make it show up?

Shehata Gamal · Accepted Answer · 2018-12-31 14:41:49Z

1

Change background to

view.backgroundColor = .green // for example

or

activityIndicatorView.style = .white

then you' ll see it , as it's nearly a color match between the indicator and the background view

edited Dec 31, 2018 at 14:41

answered Dec 31, 2018 at 14:33

Shehata Gamal

101k8 gold badges75 silver badges95 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Cesare Over a year ago

I want the view's background color to be black.

Shehata Gamal Over a year ago

gray is very near from black

Cesare Over a year ago

I mean the spinning wheels should be white or whatever that is.

Cesare Over a year ago

The view background color should be strictly black.

Collectives™ on Stack Overflow

UIActivityIndicatorView not showing up in iOS UIViewController

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related