async void OnFetchDataTap(object sender, EventArgs e)
{
InitialiseChart();
BTProgressHUD.Show("Fetching data");
var data = await GetDataAsync();
// set data source
var barSeriesSource = new IGCategorySeriesDataSourceHelper();
barSeriesSource.Values = data.ProductSales.ToArray();
barSeriesSource.Labels = data.ProductName.ToArray();
// Create axis types and add it to the chart
var xAxisBar = new IGNumericXAxis("xAxis");
var yAxisBar = new IGCategoryYAxis("yAxis");
yAxisBar.LabelAlignment = IGHorizontalAlign.IGHorizontalAlignRight;
chart.AddAxis(xAxisBar);
chart.AddAxis(yAxisBar);
// decide on what series need to be displayed on the chart
var barSeries = new IGBarSeries("series");
barSeries.XAxis = xAxisBar;
barSeries.YAxis = yAxisBar;
// set the appropriate data sources
barSeries.DataSource = barSeriesSource;
chart.AddSeries(barSeries);
BTProgressHUD.Dismiss();
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
_chart = new IGChartView(new RectangleF(this.View.Frame.X, 30, this.View.Frame.Width, this.View.Frame.Height - 40));
_chart.Delegate = new CustomDelegate();
_chart.AutoresizingMask = UIViewAutoresizing.FlexibleHeight | UIViewAutoresizing.FlexibleWidth;
var xAxis = new IGCategoryXAxis("xAxis");
var yAxis = new IGNumericYAxis("yAxis");
_chart.AddAxis(xAxis);
_chart.AddAxis(yAxis);
yAxis.Minimum = 0;
var columnSeries = new IGAreaSeries("columnSeries");
columnSeries.XAxis = xAxis;
columnSeries.YAxis = yAxis;
SetDataSourceOnSeries(columnSeries);
_chart.AddSeries(columnSeries);
ViewModel.DataPoints.Changed.ObserveOn(RxApp.MainThreadScheduler).Subscribe(p => SetDataSourceOnSeries(columnSeries));
_invalidInputsLabel = new UILabel(new RectangleF(this.View.Frame.X + 60, 40, this.View.Frame.Width - 60, this.View.Frame.Height - 40));
_invalidInputsLabel.Lines = 0;
_invalidInputsLabel.LineBreakMode = UILineBreakMode.WordWrap;
_invalidInputsLabel.Text = ViewModel.InvalidInputsMessage;
_invalidInputsLabel.TextAlignment = UITextAlignment.Left;
this.View.AddSubview(_invalidInputsLabel);
this.View.AddSubview(_chart);
Action assignVisibility = () =>
{
_invalidInputsLabel.Hidden = ViewModel.HasValidInputs;
_chart.Hidden = !ViewModel.HasValidInputs;
};
assignVisibility();
ViewModel.WhenAnyValue(p => p.HasValidInputs)
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(p => assignVisibility());
}