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void PauseAnimation()
{
	var pausedTime = Layer.ConvertTimeFromLayer(CAAnimation.CurrentMediaTime(), null);
	Layer.Speed = 0.0f;
	Layer.TimeOffset = pausedTime;
}

void ResumeAnimation()
{
  var pausedTime = Layer.TimeOffset;

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// first, separate your drawing code from your animation code.
// this way you can call animations without instantiating new objects
func drawLine() {
    let path = UIBezierPath()
    // draw your path with no position translation.. move the layer
    path.moveToPoint(CGPointMake(view.bounds.width, 0))
    path.addLineToPoint(CGPointMake(0, 0))
    pathLayer.frame = path.bounds
    // this line sets the position of the layer appropriately
    pathLayer.position = view.bounds.width - pathLayer.bounds.width / 2

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public DateTime ConvertNsDateToDateTime(NSDate date)
{
  DateTime newDate = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(2001, 1, 1, 0, 0, 0));
  return newDate.AddSeconds(date.SecondsSinceReferenceDate);
}

public NSDate ConvertDateTimeToNSDate(DateTime date)
{
  DateTime newDate = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(2001, 1, 1, 0, 0, 0));
  return NSDate.FromTimeIntervalSinceReferenceDate((date - newDate).TotalSeconds);

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// --------------------------------------
// ANDROID
// --------------------------------------
var id = Android.OS.Build.Serial;

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CrossConnectivity.Current.ConnectivityChanged += async (sender, args) =>
{
    try
    {
        GlobalVariables.Instance.IsNetworkReachable = args.IsConnected;
        if (GlobalVariables.Instance.IsNetworkReachable)
        {
            // stuff here that needs to be done when connectivity restored
            // (e.g. updating list of purchases for in-app purchases/billing
        }

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// Android
Vibrator vibrator = (Vibrator) this.ApplicationContext.GetSystemService(Context.VibratorService);
// iOS
SystemSound.Vibrate.PlayAlertSound();
// Windows Phone
VibrateController testVibrateController = VibrateController.Default;
vibrate.Start(TimeSpan.FromMilliseconds(1000));

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// listen to keyboards events
NSNotificationCenter.DefaultCenter.AddObserver(UIKeyboard.WillShowNotification, OnKeyboardNotification);
NSNotificationCenter.DefaultCenter.AddObserver(UIKeyboard.WillHideNotification, OnKeyboardNotification);

// reposition the view
void OnKeyboardNotification(NSNotification notification) {
  var visible = notification.Name == UIKeyboard.WillShowNotification;
  var location = _origin.Location;
        if (visible) {
            var keyboardFrame = UIKeyboard.FrameEndFromNotification(notification);

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var text = new NSString(_view.Text.Value).CreateStringByAddingPercentEncoding(NSUrlUtilities_NSCharacterSet.UrlHostAllowedCharacterSet);
var url = new NSUrl($"whatsapp://send?text={text}");
if (UIApplication.SharedApplication.CanOpenUrl(url)) {
    if (UIDevice.CurrentDevice.CheckSystemVersion(10, 0)) {
        UIApplication.SharedApplication.OpenUrl(url, new UIApplicationOpenUrlOptions(), null);
    } else {
        UIApplication.SharedApplication.OpenUrl(url);
    }
} else {
    // Error

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var refreshControl: UIRefreshControl!

override func viewDidLoad() {
   super.viewDidLoad()

   refreshControl = UIRefreshControl()
   refreshControl.attributedTitle = NSAttributedString(string: "Pull to refresh")
   refreshControl.addTarget(self, action: "refresh:", forControlEvents: UIControlEvents.ValueChanged)
   tableView.addSubview(refreshControl) // not required when using UITableViewController
}

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var typeInfo = GetType ().GetTypeInfo ();
var myAttr = typeInfo.CustomAttributes.FirstOrDefault (_ => _.AttributeType == typeof (MyAttribute));
Value = myAttr?.ConstructorArguments.First ().Value as string;