UIActivityIndicatorView

create spinner

activityIndicator=UIActivityIndicatorView(frame:CGRectMake(0, 0, 50, 50))
activityIndicator.hidesWhenStopped=true
activityIndicator.activityIndicatorViewStyle = .Gray
activityIndicator.center=self.view.center
view.addSubview(activityIndicator)
activityIndicator.startAnimating()


activityIndicator.stopAnimating()