private void selectGoodScrollPoint(TimeSpan timeOfDay)
        {
            var frameHeight =
                CalendarCollectionView.Frame.Height
                - CalendarCollectionView.ContentInset.Top
                - CalendarCollectionView.ContentInset.Bottom;
            var hoursOnScreen = frameHeight / (CalendarCollectionView.ContentSize.Height / 24);
            var centeredHour  = calculateCenteredHour(timeOfDay.TotalHours, hoursOnScreen);

            var offsetY      = (centeredHour / 24) * CalendarCollectionView.ContentSize.Height - (frameHeight / 2);
            var scrollPointY = offsetY.Clamp(0, CalendarCollectionView.ContentSize.Height - frameHeight);
            var offset       = new CGPoint(0, scrollPointY);

            CalendarCollectionView.SetContentOffset(offset, false);
        }
        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            settingsButton.SetImage(UIImage.FromBundle("icSettings"), UIControlState.Normal);

            ViewModel
            .ShouldShowOnboarding
            .FirstAsync()
            .Subscribe(
                shouldShowOnboarding => OnboardingView.Alpha = shouldShowOnboarding ? 1: 0)
            .DisposedBy(DisposeBag);

            this.Bind(ViewModel.ShouldShowOnboarding, OnboardingView.Rx().IsVisibleWithFade());
            this.Bind(GetStartedButton.Rx().Tap(), ViewModel.GetStartedAction);

            var timeService = Mvx.Resolve <ITimeService>();

            dataSource = new CalendarCollectionViewSource(
                CalendarCollectionView,
                ViewModel.Date,
                ViewModel.TimeOfDayFormat,
                ViewModel.CalendarItems);

            layout = new CalendarCollectionViewLayout(timeService, dataSource);

            editItemHelper       = new CalendarCollectionViewEditItemHelper(CalendarCollectionView, dataSource, layout);
            createFromSpanHelper = new CalendarCollectionViewCreateFromSpanHelper(CalendarCollectionView, dataSource, layout);

            CalendarCollectionView.SetCollectionViewLayout(layout, false);
            CalendarCollectionView.Delegate     = dataSource;
            CalendarCollectionView.DataSource   = dataSource;
            CalendarCollectionView.ContentInset = new UIEdgeInsets(20, 0, 20, 0);

            this.Bind(dataSource.ItemTapped, ViewModel.OnItemTapped);
            this.Bind(settingsButton.Rx().Tap(), ViewModel.SelectCalendars);
            this.Bind(editItemHelper.EditCalendarItem, ViewModel.OnUpdateTimeEntry);
            this.Bind(ViewModel.SettingsAreVisible, settingsButton.Rx().IsVisible());
            this.Bind(createFromSpanHelper.CreateFromSpan, ViewModel.OnDurationSelected);

            CalendarCollectionView.LayoutIfNeeded();
            var currentTimeY     = layout.FrameForCurrentTime().Y;
            var scrollPointY     = currentTimeY - View.Frame.Height / 2;
            var currentTimePoint = new CGPoint(0, scrollPointY.Clamp(0, CalendarCollectionView.ContentSize.Height));

            CalendarCollectionView.SetContentOffset(currentTimePoint, false);
        }
 public void ScrollToTop()
 {
     CalendarCollectionView.SetContentOffset(CGPoint.Empty, true);
 }