super: UIActivityIndicatorView on iOS
Use an activity indicator to show that a task is in progress. An activity indicator appears as a "gear" that is either spinning or stopped.
Load() This event is called when the object becames available in the current runtime system.
Unload() This event is called when the object has been removed from the current runtime system (but not yet deallocated).
var color: Color The color of the activity indicator.
var style: ActivityIndicatorStyle The basic appearance of the activity indicator.
var hidesWhenStopped: Bool A Boolean value that controls whether the receiver is hidden when the animation is stopped.
func startAnimating() Starts the animation of the activity indicator.
func stopAnimating() Stops the animation of the activity indicator.
func isAnimating(): Bool Returns true if the animation is active, false if it isn't.
func animate(duration: Float, delay: Float, options: AnimationOption, closure: Closure, completion: Closure) Animate changes to one or more views using the specified duration, delay, options and completion handler.