public void Show(string text) {
// figure out parent
UIView parentView = null;
if ((UIApplication.deviceRootViewController != null)
&& (UIApplication.deviceRootViewController.view != null))
parentView = UIApplication.deviceRootViewController.view;
else
parentView = UIApplication.SharedApplication().keyWindow;
var frame = parentView.bounds;
// create view
if (_activityView == null) {
_activityView = new UIView(frame);
_activityView.alpha = 0.8f;
_activityView.backgroundColor = UIColor.BlackColor();
_activityIndicator = new UIActivityIndicatorView(UIActivityIndicatorViewStyle.WhiteLarge);
_activityIndicator.hidesWhenStopped = false;
_activityView.AddSubview(_activityIndicator);
_activityLabel = new UILabel(frame);
_activityLabel.textAlignment = NSTextAlignment.Center;
_activityLabel.backgroundColor = UIColor.ClearColor();
_activityLabel.textColor = UIColor.WhiteColor();
_activityLabel.numberOfLines = 2;
_activityView.AddSubview(_activityLabel);
}
// re-set frames
_activityView.frame = frame;
var indiFrame = _activityIndicator.frame;
indiFrame.x = frame.width / 2 - indiFrame.width / 2;
indiFrame.y = frame.height / 2 - indiFrame.height / 2;
_activityIndicator.frame = indiFrame;
var labelFrame = new Rect(0, indiFrame.yMax, frame.width, indiFrame.height * 2);
_activityLabel.frame = labelFrame;
_activityLabel.text = text;
// add it to parent
if (_activityView.superview == null) {
_activityIndicator.StartAnimating();
parentView.AddSubview(_activityView);
}
}