柱状图新增圆角属性

Source/Charts/Data/Implementations/ChartBaseDataSet.swift

@@ -189,6 +189,8 @@ open class ChartBaseDataSet: NSObject, ChartDataSetProtocol, NSCopying
     /// Colors are reused as soon as the number of Entries the DataSet represents is higher than the size of the colors array.
     open var colors = [NSUIColor]()
 
+    open var cornerRadius: Double = 0
+
     /// List representing all colors that are used for drawing the actual values for this DataSet
     open var valueColors = [NSUIColor]()
 

Source/Charts/Data/Interfaces/ChartDataSetProtocol.swift

@@ -179,6 +179,8 @@ public protocol ChartDataSetProtocol
     /// Colors are reused as soon as the number of Entries the DataSet represents is higher than the size of the colors array.
     var colors: [NSUIColor] { get }
 
+    var cornerRadius: Double { get }
+
     /// - Returns: The color at the given index of the DataSet's color array.
     /// This prevents out-of-bounds by performing a modulus on the color index, so colours will repeat themselves.
     func color(atIndex: Int) -> NSUIColor

Source/Charts/Renderers/BarChartRenderer.swift

@@ -379,7 +379,13 @@ open class BarChartRenderer: BarLineScatterCandleBubbleRenderer
                 context.setFillColor(dataSet.color(atIndex: j).cgColor)
             }
 
-            context.fill(barRect)
+            if dataSet.cornerRadius > 0 {
+                let bezierPath = UIBezierPath(roundedRect: barRect,byRoundingCorners: [.topLeft, .topRight],cornerRadii:CGSize(width:dataSet.cornerRadius,height:dataSet.cornerRadius));
+                context.addPath(bezierPath.cgPath)
+                context.drawPath(using: .fill)
+            } else {
+                context.fill(barRect)
+            }
 
             if drawBorder
             {
@@ -744,7 +750,13 @@ open class BarChartRenderer: BarLineScatterCandleBubbleRenderer
 
                 setHighlightDrawPos(highlight: high, barRect: barRect)
 
-                context.fill(barRect)
+                if set.cornerRadius > 0 {
+                    let bezierPath = UIBezierPath(roundedRect: barRect,byRoundingCorners: [.topLeft, .topRight],cornerRadii:CGSize(width:set.cornerRadius,height:set.cornerRadius));
+                    context.addPath(bezierPath.cgPath)
+                    context.drawPath(using: .fill)
+                } else {
+                    context.fill(barRect)
+                }
             }
         }
     }