Remove internal use of datasets

Source/Charts/Charts/ChartViewBase.swift

@@ -62,7 +62,7 @@ open class ChartViewBase: NSUIView, ChartDataProvider, AnimatorDelegate
             // calculate how many digits are needed
             setupDefaultFormatter(min: data.yMin, max: data.yMax)
 
-            for set in data.dataSets
+            for set in data
             {
                 if set.valueFormatter is DefaultValueFormatter
                 {

Source/Charts/Charts/PieChartView.swift

@@ -320,7 +320,7 @@ open class PieChartView: PieRadarChartViewBase
     @objc open func dataSetIndexForIndex(_ xValue: Double) -> Int
     {
         // TODO: Return nil instead of -1
-        return data?.dataSets.firstIndex {
+        return data?.firstIndex {
             $0.entryForXValue(xValue, closestToY: .nan) != nil
         } ?? -1
     }

Source/Charts/Data/Implementations/Standard/ChartDataSet.swift

@@ -375,7 +375,7 @@ open class ChartDataSet: ChartBaseDataSet
     ///   - e: the entry to add
     /// - Returns: True
     // TODO: This should return `Void` to follow Swift convention
-    @available(*, deprecated, message: "Use `append(_:)` instead")
+    @available(*, deprecated, message: "Use `append(_:)` instead", renamed: "append(_:)")
     open override func addEntry(_ e: ChartDataEntry) -> Bool
     {
         append(e)

Source/Charts/Data/Implementations/Standard/CombinedChartData.swift

@@ -119,8 +119,7 @@ open class CombinedChartData: BarLineScatterCandleBubbleChartData
         {
             data.calcMinMax()
 
-            let sets = data.dataSets
-            _dataSets.append(contentsOf: sets)
+            _dataSets.append(contentsOf: data)
 
             if data.yMax > yMax
             {
@@ -142,28 +141,28 @@ open class CombinedChartData: BarLineScatterCandleBubbleChartData
                 xMin = data.xMin
             }
 
-            for dataset in sets
+            for set in data
             {
-                if dataset.axisDependency == .left
+                if set.axisDependency == .left
                 {
-                    if dataset.yMax > leftAxisMax
+                    if set.yMax > leftAxisMax
                     {
-                        leftAxisMax = dataset.yMax
+                        leftAxisMax = set.yMax
                     }
-                    if dataset.yMin < leftAxisMin
+                    if set.yMin < leftAxisMin
                     {
-                        leftAxisMin = dataset.yMin
+                        leftAxisMin = set.yMin
                     }
                 }
                 else
                 {
-                    if dataset.yMax > rightAxisMax
+                    if set.yMax > rightAxisMax
                     {
-                        rightAxisMax = dataset.yMax
+                        rightAxisMax = set.yMax
                     }
-                    if dataset.yMin < rightAxisMin
+                    if set.yMin < rightAxisMin
                     {
-                        rightAxisMin = dataset.yMin
+                        rightAxisMin = set.yMin
                     }
                 }
             }

Source/Charts/Highlight/PieHighlighter.swift

@@ -18,7 +18,7 @@ open class PieHighlighter: PieRadarHighlighter
     open override func closestHighlight(index: Int, x: CGFloat, y: CGFloat) -> Highlight?
     {
         guard
-            let set = chart?.data?.dataSets[0],
+            let set = chart?.data?[0],
             let entry = set.entryForIndex(index)
             else { return nil }
 

Source/Charts/Renderers/BarChartRenderer.swift

@@ -71,7 +71,7 @@ open class BarChartRenderer: BarLineScatterCandleBubbleRenderer
             }
         }
 
-        _buffers = zip(_buffers, barData.dataSets).map { buffer, set -> Buffer in
+        _buffers = zip(_buffers, barData).map { buffer, set -> Buffer in
             let set = set as! BarChartDataSetProtocol
             let size = set.entryCount * (set.isStacked ? set.stackSize : 1)
             return buffer.count == size
@@ -436,17 +436,15 @@ open class BarChartRenderer: BarLineScatterCandleBubbleRenderer
                 let barData = dataProvider.barData
                 else { return }
 
-            let dataSets = barData.dataSets
-
             let valueOffsetPlus: CGFloat = 4.5
             var posOffset: CGFloat
             var negOffset: CGFloat
             let drawValueAboveBar = dataProvider.isDrawValueAboveBarEnabled
 
-            for dataSetIndex in barData.dataSets.indices
+            for dataSetIndex in barData.indices
             {
                 guard
-                    let dataSet = dataSets[dataSetIndex] as? BarChartDataSetProtocol,
+                    let dataSet = barData[dataSetIndex] as? BarChartDataSetProtocol,
                     shouldDrawValues(forDataSet: dataSet)
                     else { continue }
 

Source/Charts/Renderers/BubbleChartRenderer.swift

@@ -45,7 +45,7 @@ open class BubbleChartRenderer: BarLineScatterCandleBubbleRenderer
             accessibleChartElements.append(element)
         }
 
-        for (i, set) in (bubbleData.dataSets as! [BubbleChartDataSetProtocol]).enumerated() where set.isVisible
+        for case let (i, set) as (Int, BubbleChartDataSetProtocol) in bubbleData.enumerated() where set.isVisible
         {
             drawDataSet(context: context, dataSet: set, dataSetIndex: i)
         }
@@ -153,20 +153,22 @@ open class BubbleChartRenderer: BarLineScatterCandleBubbleRenderer
         guard let
             dataProvider = dataProvider,
             let bubbleData = dataProvider.bubbleData,
-            isDrawingValuesAllowed(dataProvider: dataProvider),
-            let dataSets = bubbleData.dataSets as? [BubbleChartDataSetProtocol]
+            isDrawingValuesAllowed(dataProvider: dataProvider)
             else { return }
 
         let phaseX = max(0.0, min(1.0, animator.phaseX))
         let phaseY = animator.phaseY
 
         var pt = CGPoint()
 
-        for i in dataSets.indices
+        for i in bubbleData.indices
         {
-            let dataSet = dataSets[i]
-
-            guard shouldDrawValues(forDataSet: dataSet) else { continue }
+            guard let dataSet = bubbleData[i] as? BubbleChartDataSetProtocol,
+                  shouldDrawValues(forDataSet: dataSet)
+            else
+            {
+                continue
+            }
 
             let formatter = dataSet.valueFormatter
             let alpha = phaseX == 1 ? phaseY : phaseX

Source/Charts/Renderers/CandleStickChartRenderer.swift

@@ -38,7 +38,7 @@ open class CandleStickChartRenderer: LineScatterCandleRadarRenderer
             accessibleChartElements.append(element)
         }
 
-        for set in candleData.dataSets as! [CandleChartDataSetProtocol] where set.isVisible
+        for case let set as CandleChartDataSetProtocol in candleData where set.isVisible
         {
             drawDataSet(context: context, dataSet: set)
         }
@@ -81,7 +81,7 @@ open class CandleStickChartRenderer: LineScatterCandleRadarRenderer
             let high = e.high
             let low = e.low
 
-            let doesContainMultipleDataSets = (dataProvider.candleData?.dataSets.count ?? 1) > 1
+            let doesContainMultipleDataSets = (dataProvider.candleData?.count ?? 1) > 1
             var accessibilityMovementDescription = "neutral"
             var accessibilityRect = CGRect(x: CGFloat(xPos) + 0.5 - barSpace,
                                            y: CGFloat(low * phaseY),
@@ -275,16 +275,14 @@ open class CandleStickChartRenderer: LineScatterCandleRadarRenderer
         // if values are drawn
         if isDrawingValuesAllowed(dataProvider: dataProvider)
         {
-            let dataSets = candleData.dataSets
-
             let phaseY = animator.phaseY
 
             var pt = CGPoint()
 
-            for i in dataSets.indices
+            for i in candleData.indices
             {
                 guard let
-                    dataSet = dataSets[i] as? BarLineScatterCandleBubbleChartDataSetProtocol,
+                    dataSet = candleData[i] as? BarLineScatterCandleBubbleChartDataSetProtocol,
                     shouldDrawValues(forDataSet: dataSet)
                     else { continue }
 

Source/Charts/Renderers/DataRenderer.swift

@@ -62,11 +62,10 @@ internal struct AccessibleHeader {
                                 withDefaultDescription defaultDescription: String = "Chart") -> NSUIAccessibilityElement
     {
         let chartDescriptionText = chart.chartDescription.text ?? defaultDescription
-        let dataSetDescriptions = data.dataSets.map { $0.label ?? "" }
+        let dataSetDescriptions = data.map { $0.label ?? "" }
         let dataSetDescriptionText = dataSetDescriptions.joined(separator: ", ")
-
-        let
-        element = NSUIAccessibilityElement(accessibilityContainer: chart)
+
+        let element = NSUIAccessibilityElement(accessibilityContainer: chart)
         element.accessibilityLabel = chartDescriptionText + ". \(data.count) dataset\(data.count == 1 ? "" : "s"). \(dataSetDescriptionText)"
         element.accessibilityFrame = chart.bounds
         element.isHeader = true

Source/Charts/Renderers/HorizontalBarChartRenderer.swift

@@ -51,7 +51,7 @@ open class HorizontalBarChartRenderer: BarChartRenderer
 
             for i in barData.indices
             {
-                let set = barData.dataSets[i] as! BarChartDataSetProtocol
+                let set = barData[i] as! BarChartDataSetProtocol
                 let size = set.entryCount * (set.isStacked ? set.stackSize : 1)
                 if _buffers[i].rects.count != size
                 {
@@ -323,9 +323,7 @@ open class HorizontalBarChartRenderer: BarChartRenderer
                 let dataProvider = dataProvider,
                 let barData = dataProvider.barData
                 else { return }
-
-            let dataSets = barData.dataSets
-
+
             let textAlign = NSTextAlignment.left
 
             let valueOffsetPlus: CGFloat = 5.0
@@ -336,7 +334,7 @@ open class HorizontalBarChartRenderer: BarChartRenderer
             for dataSetIndex in barData.indices
             {
                 guard let
-                    dataSet = dataSets[dataSetIndex] as? BarChartDataSetProtocol,
+                    dataSet = barData[dataSetIndex] as? BarChartDataSetProtocol,
                     shouldDrawValues(forDataSet: dataSet)
                     else { continue }
 

Source/Charts/Renderers/LineChartRenderer.swift

@@ -527,16 +527,14 @@ open class LineChartRenderer: LineRadarRenderer
 
         if isDrawingValuesAllowed(dataProvider: dataProvider)
         {
-            let dataSets = lineData.dataSets
-
             let phaseY = animator.phaseY
 
             var pt = CGPoint()
 
-            for i in dataSets.indices
+            for i in lineData.indices
             {
                 guard let
-                    dataSet = dataSets[i] as? LineChartDataSetProtocol,
+                    dataSet = lineData[i] as? LineChartDataSetProtocol,
                     shouldDrawValues(forDataSet: dataSet)
                     else { continue }
 
@@ -618,8 +616,6 @@ open class LineChartRenderer: LineRadarRenderer
             else { return }
 
         let phaseY = animator.phaseY
-
-        let dataSets = lineData.dataSets
 
         var pt = CGPoint()
         var rect = CGRect()
@@ -638,7 +634,7 @@ open class LineChartRenderer: LineRadarRenderer
 
         context.saveGState()
 
-        for i in dataSets.indices
+        for i in lineData.indices
         {
             guard let dataSet = lineData[i] as? LineChartDataSetProtocol else { continue }
 

Source/Charts/Renderers/PieChartRenderer.swift

@@ -38,20 +38,15 @@ open class PieChartRenderer: NSObject, DataRenderer
 
     open func drawData(context: CGContext)
     {
-        guard let chart = chart else { return }
+        guard let chart = chart, let pieData = chart.data else { return }
 
-        let pieData = chart.data
+        // If we redraw the data, remove and repopulate accessible elements to update label values and frames
+        accessibleChartElements.removeAll()
 
-        if pieData != nil
+        for case let set as PieChartDataSetProtocol in pieData where
+            set.isVisible && set.entryCount > 0
         {
-            // If we redraw the data, remove and repopulate accessible elements to update label values and frames
-            accessibleChartElements.removeAll()
-
-            for set in pieData!.dataSets as! [PieChartDataSetProtocol]
-                where set.isVisible && set.entryCount > 0
-            {
-                drawDataSet(context: context, dataSet: set)
-            }
+            drawDataSet(context: context, dataSet: set)
         }
     }
 
@@ -326,8 +321,6 @@ open class PieChartRenderer: NSObject, DataRenderer
 
         let labelRadius = radius - labelRadiusOffset
 
-        let dataSets = data.dataSets
-
         let yValueSum = (data as! PieChartData).yValueSum
 
         let drawEntryLabels = chart.isDrawEntryLabelsEnabled
@@ -340,9 +333,9 @@ open class PieChartRenderer: NSObject, DataRenderer
         context.saveGState()
         defer { context.restoreGState() }
 
-        for i in dataSets.indices
+        for i in data.indices
         {
-            guard let dataSet = dataSets[i] as? PieChartDataSetProtocol else { continue }
+            guard let dataSet = data[i] as? PieChartDataSetProtocol else { continue }
 
             let drawValues = dataSet.isDrawValuesEnabled
 

Source/Charts/Renderers/RadarChartRenderer.swift

@@ -35,29 +35,26 @@ open class RadarChartRenderer: LineRadarRenderer
 
     open override func drawData(context: CGContext)
     {
-        guard let chart = chart else { return }
-
-        let radarData = chart.data
-
-        if radarData != nil
+        guard let chart = chart,
+              let radarData = chart.data as? RadarChartData else
         {
-            let mostEntries = radarData?.maxEntryCountSet?.entryCount ?? 0
+            return
+        }
+
+        let mostEntries = radarData.maxEntryCountSet?.entryCount ?? 0
 
-            // If we redraw the data, remove and repopulate accessible elements to update label values and frames
-            self.accessibleChartElements.removeAll()
+        // If we redraw the data, remove and repopulate accessible elements to update label values and frames
+        self.accessibleChartElements.removeAll()
 
-            // Make the chart header the first element in the accessible elements array
-            if let accessibilityHeaderData = radarData as? RadarChartData {
-                let element = createAccessibleHeader(usingChart: chart,
-                                                     andData: accessibilityHeaderData,
-                                                     withDefaultDescription: "Radar Chart")
-                self.accessibleChartElements.append(element)
-            }
+        // Make the chart header the first element in the accessible elements array
+        let element = createAccessibleHeader(usingChart: chart,
+                                             andData: radarData,
+                                             withDefaultDescription: "Radar Chart")
+        self.accessibleChartElements.append(element)
 
-            for set in radarData!.dataSets as! [RadarChartDataSetProtocol] where set.isVisible
-            {
-                drawDataSet(context: context, dataSet: set, mostEntries: mostEntries)
-            }
+        for case let set as RadarChartDataSetProtocol in radarData where set.isVisible
+        {
+            drawDataSet(context: context, dataSet: set, mostEntries: mostEntries)
         }
     }
 

Source/Charts/Renderers/ScatterChartRenderer.swift

@@ -113,18 +113,15 @@ open class ScatterChartRenderer: LineScatterCandleRadarRenderer
 
         // if values are drawn
         if isDrawingValuesAllowed(dataProvider: dataProvider)
-        {
-            guard let dataSets = scatterData.dataSets as? [ScatterChartDataSetProtocol] else { return }
-
+        {            
             let phaseY = animator.phaseY
 
             var pt = CGPoint()
 
             for i in scatterData.indices
             {
-                let dataSet = dataSets[i]
-
-                guard shouldDrawValues(forDataSet: dataSet)
+                guard let dataSet = scatterData[i] as? ScatterChartDataSetProtocol,
+                      shouldDrawValues(forDataSet: dataSet)
                     else { continue }
 
                 let valueFont = dataSet.valueFont