Accessibility Support for (most) Chart types

Charts.xcodeproj/project.pbxproj

@@ -98,6 +98,7 @@
 		9400725714D0DA707DDECD2E /* ViewPortJob.swift in Sources */ = {isa = PBXBuildFile; fileRef = FA7BDB22C97F39A4B33E38A7 /* ViewPortJob.swift */; };
 		95B6D6F35684292A62DBEA74 /* LineChartDataSet.swift in Sources */ = {isa = PBXBuildFile; fileRef = A5A75AA73C5AA381DA517959 /* LineChartDataSet.swift */; };
 		967EE2EDDE3337C5C4337C59 /* IndexAxisValueFormatter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 10DD0A02E3CF611BD11EBA9B /* IndexAxisValueFormatter.swift */; };
+		97AD2D4620AF917100F9C24A /* Platform+Accessibility.swift in Sources */ = {isa = PBXBuildFile; fileRef = 97AD2D4520AF917100F9C24A /* Platform+Accessibility.swift */; };
 		97E033CC0ABEF0F448DAFA8E /* DataApproximator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 93EF9709CF635BEE70D1ABC5 /* DataApproximator.swift */; };
 		98E2EEF45E8933E4AD182D58 /* ChartViewBase.swift in Sources */ = {isa = PBXBuildFile; fileRef = 30EFAD7920F76360ADB3B5F5 /* ChartViewBase.swift */; };
 		9A26C8DB1F87B01700367599 /* DataApproximator+N.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9A26C8DA1F87B01700367599 /* DataApproximator+N.swift */; };
@@ -257,6 +258,7 @@
 		923206233CA89FD03565FF87 /* LineScatterCandleRadarRenderer.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; name = LineScatterCandleRadarRenderer.swift; path = Source/Charts/Renderers/LineScatterCandleRadarRenderer.swift; sourceTree = "<group>"; };
 		9249AD9AEC8C85772365A128 /* ILineScatterCandleRadarChartDataSet.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; name = ILineScatterCandleRadarChartDataSet.swift; path = Source/Charts/Data/Interfaces/ILineScatterCandleRadarChartDataSet.swift; sourceTree = "<group>"; };
 		93EF9709CF635BEE70D1ABC5 /* DataApproximator.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; name = DataApproximator.swift; path = Source/Charts/Filters/DataApproximator.swift; sourceTree = "<group>"; };
+		97AD2D4520AF917100F9C24A /* Platform+Accessibility.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = "Platform+Accessibility.swift"; path = "Source/Charts/Utils/Platform+Accessibility.swift"; sourceTree = "<group>"; };
 		998F2BFE318471AFC05B50AC /* IHighlighter.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; name = IHighlighter.swift; path = Source/Charts/Highlight/IHighlighter.swift; sourceTree = "<group>"; };
 		9A26C8DA1F87B01700367599 /* DataApproximator+N.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = "DataApproximator+N.swift"; path = "Source/Charts/Filters/DataApproximator+N.swift"; sourceTree = "<group>"; };
 		9D7184C8A5A60A3522AB9B05 /* BarChartDataProvider.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; name = BarChartDataProvider.swift; path = Source/Charts/Interfaces/BarChartDataProvider.swift; sourceTree = "<group>"; };
@@ -584,6 +586,7 @@
 				3FDA09EF973925A110506799 /* ChartUtils.swift */,
 				5A4CFFFB65819121595F06F1 /* Fill.swift */,
 				3ED23C354AFE81818D78E645 /* Platform.swift */,
+				97AD2D4520AF917100F9C24A /* Platform+Accessibility.swift */,
 				FF475B9593B9898853814340 /* Transformer.swift */,
 				324C9127B53A8D39C8B49277 /* TransformerHorizontalBarChart.swift */,
 				72EAEBB7CF73E33565FC2896 /* ViewPortHandler.swift */,
@@ -923,6 +926,7 @@
 				24151B0729D77251A8494D70 /* LineRadarRenderer.swift in Sources */,
 				B6DCC229615EFE706F64A37D /* LineScatterCandleRadarRenderer.swift in Sources */,
 				795E100895C24049509F1EDE /* PieChartRenderer.swift in Sources */,
+				97AD2D4620AF917100F9C24A /* Platform+Accessibility.swift in Sources */,
 				69EA073EDF75D49ABE1715D6 /* RadarChartRenderer.swift in Sources */,
 				CEF68F42A5390A73113F3663 /* Renderer.swift in Sources */,
 				796D3E63A37A95FD9D1AB9A1 /* ChevronDownShapeRenderer.swift in Sources */,

Source/Charts/Charts/ChartViewBase.swift

@@ -367,6 +367,12 @@ open class ChartViewBase: NSUIView, ChartDataProvider, AnimatorDelegate
             attributes: attrs)
     }
 
+    // MARK: - Accessibility
+
+    open override func accessibilityChildren() -> [Any]? {
+        return renderer?.accessibleChartElements
+    }
+
     // MARK: - Highlighting
 
     /// - returns: The array of currently highlighted values. This might an empty if nothing is highlighted.

Source/Charts/Components/Description.swift

@@ -34,7 +34,7 @@ open class Description: ComponentBase
     }
 
     /// The text to be shown as the description.
-    @objc open var text: String? = "Description Label"
+    @objc open var text: String?
 
     /// Custom position for the description text in pixels on the screen.
     open var position: CGPoint? = nil

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

@@ -756,4 +756,20 @@ open class ChartData: NSObject
 
         return max
     }
+
+    // MARK: - Accessibility
+
+    /// When the data entry labels are generated identifiers, set this property to prepend a string before each identifier
+    ///
+    /// For example, if a label is "#3", settings this property to "Item" allows it to be spoken as "Item #3"
+    @objc open var accessibilityEntryLabelPrefix: String?
+
+    /// When the data entry value requires a unit, use this property to append the string representation of the unit to the value
+    ///
+    /// For example, if a value is "44.1", setting this property to "m" allows it to be spoken as "44.1 m"
+    @objc open var accessibilityEntryLabelSuffix: String?
+
+    /// If the data entry value is a count, set this to true to allow plurals and other grammatical changes
+    /// **default**: false
+    @objc open var accessibilityEntryLabelSuffixIsCount: Bool = false
 }

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

@@ -20,34 +20,34 @@ open class PieChartDataSet: ChartDataSet, IPieChartDataSet
         case insideSlice
         case outsideSlice
     }
-    
+
     private func initialize()
     {
         self.valueTextColor = NSUIColor.white
         self.valueFont = NSUIFont.systemFont(ofSize: 13.0)
     }
-    
+
     public required init()
     {
         super.init()
         initialize()
     }
-    
+
     public override init(values: [ChartDataEntry]?, label: String?)
     {
         super.init(values: values, label: label)
         initialize()
     }
-    
+
     internal override func calcMinMax(entry e: ChartDataEntry)
     {
         calcMinMaxY(entry: e)
     }
-    
+
     // MARK: - Styling functions and accessors
-    
+
     private var _sliceSpace = CGFloat(0.0)
-    
+
     /// the space in pixels between the pie-slices
     /// **default**: 0
     /// **maximum**: 20
@@ -74,42 +74,42 @@ open class PieChartDataSet: ChartDataSet, IPieChartDataSet
 
     /// When enabled, slice spacing will be 0.0 when the smallest value is going to be smaller than the slice spacing itself.
     open var automaticallyDisableSliceSpacing: Bool = false
-    
+
     /// indicates the selection distance of a pie slice
     open var selectionShift = CGFloat(18.0)
-    
+
     open var xValuePosition: ValuePosition = .insideSlice
     open var yValuePosition: ValuePosition = .insideSlice
-    
+
     /// When valuePosition is OutsideSlice, indicates line color
     open var valueLineColor: NSUIColor? = NSUIColor.black
-    
+
     /// When valuePosition is OutsideSlice, indicates line width
     open var valueLineWidth: CGFloat = 1.0
-    
+
     /// When valuePosition is OutsideSlice, indicates offset as percentage out of the slice size
     open var valueLinePart1OffsetPercentage: CGFloat = 0.75
-    
+
     /// When valuePosition is OutsideSlice, indicates length of first half of the line
     open var valueLinePart1Length: CGFloat = 0.3
-    
+
     /// When valuePosition is OutsideSlice, indicates length of second half of the line
     open var valueLinePart2Length: CGFloat = 0.4
-    
+
     /// When valuePosition is OutsideSlice, this allows variable line length
     open var valueLineVariableLength: Bool = true
-    
+
     /// the font for the slice-text labels
     open var entryLabelFont: NSUIFont? = nil
-    
+
     /// the color for the slice-text labels
     open var entryLabelColor: NSUIColor? = nil
-    
+
     /// the color for the highlighted sector
     open var highlightColor: NSUIColor? = nil
-    
+
     // MARK: - NSCopying
-    
+
     open override func copyWithZone(_ zone: NSZone?) -> AnyObject
     {
         let copy = super.copyWithZone(zone) as! PieChartDataSet

Source/Charts/Data/Interfaces/IPieChartDataSet.swift

@@ -20,45 +20,46 @@ import CoreGraphics
 public protocol IPieChartDataSet: IChartDataSet
 {
     // MARK: - Styling functions and accessors
-    
+
     /// the space in pixels between the pie-slices
     /// **default**: 0
     /// **maximum**: 20
     var sliceSpace: CGFloat { get set }
-    
+
     /// When enabled, slice spacing will be 0.0 when the smallest value is going to be smaller than the slice spacing itself.
     var automaticallyDisableSliceSpacing: Bool { get set }
-    
+
     /// indicates the selection distance of a pie slice
     var selectionShift: CGFloat { get set }
-    
+
     var xValuePosition: PieChartDataSet.ValuePosition { get set }
     var yValuePosition: PieChartDataSet.ValuePosition { get set }
-    
+
     /// When valuePosition is OutsideSlice, indicates line color
     var valueLineColor: NSUIColor? { get set }
-    
+
     /// When valuePosition is OutsideSlice, indicates line width
     var valueLineWidth: CGFloat { get set }
-    
+
     /// When valuePosition is OutsideSlice, indicates offset as percentage out of the slice size
     var valueLinePart1OffsetPercentage: CGFloat { get set }
-    
+
     /// When valuePosition is OutsideSlice, indicates length of first half of the line
     var valueLinePart1Length: CGFloat { get set }
-    
+
     /// When valuePosition is OutsideSlice, indicates length of second half of the line
     var valueLinePart2Length: CGFloat { get set }
-    
+
     /// When valuePosition is OutsideSlice, this allows variable line length
     var valueLineVariableLength: Bool { get set }
-    
+
     /// the font for the slice-text labels
     var entryLabelFont: NSUIFont? { get set }
-    
+
     /// the color for the slice-text labels
     var entryLabelColor: NSUIColor? { get set }
-    
+
     /// get/sets the color for the highlighted sector
     var highlightColor: NSUIColor? { get set }
+
 }