public static void TrackScreen(this BaseViewController viewController)
{
var analytics = viewController.GetAnalytics();
if (analytics == null)
{
return;
}
var screenName = viewController.GetType().Name;
analytics.Screen(screenName);
}
public static IObservable <CGRect> ViewportObservable(this BaseViewController viewController)
{
NSObject hideNotification = null;
NSObject showNotification = null;
var subject = new Subject <CGRect>();
var notificationAction = new Action <NSNotification>(notification =>
{
if (viewController.IsViewLoaded)
{
//Start an animation, using values from the keyboard
UIView.BeginAnimations("AnimateForKeyboard");
UIView.SetAnimationBeginsFromCurrentState(true);
UIView.SetAnimationDuration(UIKeyboard.AnimationDurationFromNotification(notification));
UIView.SetAnimationCurve((UIViewAnimationCurve)UIKeyboard.AnimationCurveFromNotification(notification));
//Pass the notification, calculating keyboard height, etc.
var nsValue = notification.UserInfo.ObjectForKey(UIKeyboard.FrameBeginUserInfoKey) as NSValue;
if (nsValue != null)
{
var kbSize = nsValue.RectangleFValue.Size;
var view = viewController.View.Bounds;
view.Height = view.Height - kbSize.Height;
subject.OnNext(view);
}
//Commit the animation
UIView.CommitAnimations();
}
});
viewController.Appearing
.Subscribe(_ =>
{
hideNotification = NSNotificationCenter.DefaultCenter.AddObserver(UIKeyboard.WillHideNotification, notificationAction);
showNotification = NSNotificationCenter.DefaultCenter.AddObserver(UIKeyboard.WillShowNotification, notificationAction);
});
viewController.Disappearing
.Where(_ => showNotification != null && hideNotification != null)
.Subscribe(_ =>
{
NSNotificationCenter.DefaultCenter.RemoveObserver(hideNotification);
NSNotificationCenter.DefaultCenter.RemoveObserver(showNotification);
});
return(subject);
}
public static IAnalyticsService GetAnalytics(this BaseViewController viewController)
{
return(Locator.Current.GetService <IAnalyticsService>());
}
