Swift version: 5.6
If you need a simple visual way to show users that some activity is happening, UIActivityIndicatorView
is the easiest approach. In fact, if you create a dedicated activity indicator view controller, you can cause the whole screen to dim without much code.
To try it out, create a new Cocoa Touch Class called SpinnerViewController, then give it this code:
import UIKit
class SpinnerViewController: UIViewController {
var spinner = UIActivityIndicatorView(style: .whiteLarge)
override func loadView() {
view = UIView()
view.backgroundColor = UIColor(white: 0, alpha: 0.7)
spinner.translatesAutoresizingMaskIntoConstraints = false
spinner.startAnimating()
view.addSubview(spinner)
spinner.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
spinner.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
}
You can now use view controller containment to embed that inside your current view controller so that it disables your controls. Something like this ought to be enough to get you started:
func createSpinnerView() {
let child = SpinnerViewController()
// add the spinner view controller
addChild(child)
child.view.frame = view.frame
view.addSubview(child.view)
child.didMove(toParent: self)
// wait two seconds to simulate some work happening
DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
// then remove the spinner view controller
child.willMove(toParent: nil)
child.view.removeFromSuperview()
child.removeFromParent()
}
}
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Available from iOS 5.0
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