FUIChartSummaryView

open class FUIChartSummaryView : FUIDrawingView, ChartObserver

Summary content view of Chart Floorplan, and related components.

Data Source

Developer should implement FUIChartSummaryDataSource to supply a summary item when user selects a category in the FUIChartFloorplan views.

Often, the Developer will want to pin an ‘aggregate’ summary item to the left of the summary view, which might sum values for each series over the range of categories in the chart, display the macro trend, etc. For this case, return an item for categoryIndex == -1.

Delegate

Developer may also optionally implement FUIChartSummaryDelegate, to handle user taps on summary items in the FUIChartSummaryView. According to the design guidelines, this should typically drill-down into the data slice for the selected category(ies).

Usage

let item = FUIChartSummaryItem()

// Category index `-1` used for 'aggregate' column.  True category indexes are requested by `dataSource`.
item.categoryIndex = -1
item.isEnabled = false

let values: [Double] = {
var values: [Double] = []
let seriesCount = chartData().count
   for i in 0..<seriesCount {
       values.append(chartData()[i].map({ $0 * 1000 }).suffix(from: 1).reduce(0, +))
   }
    return values
}()

item.valuesText = values.map { formattedTitleForDouble($0)! }
item.title.text = "TTM"

// If `chartView != nil`, supply an item to the `dataSource`.  Otherwise, add category index to selected set.
summaryView.addItem(at: item.category)

Attention

The delegate object with type FUIChartSummaryDelegate is declared as a weak reference. So on deallocation it will be automatically set to nil. To keep it alive as expected, developer should retain the delegate object during its whole execution scope.