Fixed copyWithZone for latest Swift 2.0 changes (Fixes #410)

Charts/Classes/Data/BarChartDataEntry.swift

@@ -24,6 +24,11 @@ public class BarChartDataEntry: ChartDataEntry
     /// the sum of all positive values this entry (if stacked) contains
     private var _positiveSum: Double = 0.0
 
+    public required init()
+    {
+        super.init()
+    }
+
     /// Constructor for stacked bar entries.
     public init(values: [Double], xIndex: Int)
     {

Charts/Classes/Data/BarChartDataSet.swift

@@ -36,6 +36,11 @@ public class BarChartDataSet: BarLineScatterCandleBubbleChartDataSet
     /// array of labels used to describe the different values of the stacked bars
     public var stackLabels: [String] = ["Stack"]
 
+    public required init()
+    {
+        super.init()
+    }
+
     public override init(yVals: [ChartDataEntry]?, label: String?)
     {
         super.init(yVals: yVals, label: label)

Charts/Classes/Data/BubbleChartDataEntry.swift

@@ -17,6 +17,11 @@ public class BubbleChartDataEntry: ChartDataEntry
     /// The size of the bubble.
     public var size = CGFloat(0.0)
 
+    public required init()
+    {
+        super.init()
+    }
+
     /// - parameter xIndex: The index on the x-axis.
     /// - parameter val: The value on the y-axis.
     /// - parameter size: The size of the bubble.

Charts/Classes/Data/CandleChartDataEntry.swift

@@ -27,6 +27,11 @@ public class CandleChartDataEntry: ChartDataEntry
     /// open value
     public var open = Double(0.0)
 
+    public required init()
+    {
+        super.init()
+    }
+
     public init(xIndex: Int, shadowH: Double, shadowL: Double, open: Double, close: Double)
     {
         super.init(value: (shadowH + shadowL) / 2.0, xIndex: xIndex)

Charts/Classes/Data/CandleChartDataSet.swift

@@ -45,6 +45,11 @@ public class CandleChartDataSet: LineScatterCandleChartDataSet
     /// Are increasing values drawn as filled?
     public var increasingFilled = true
 
+    public required init()
+    {
+        super.init()
+    }
+
     public override init(yVals: [ChartDataEntry]?, label: String?)
     {
         super.init(yVals: yVals, label: label)

Charts/Classes/Data/ChartDataEntry.swift

@@ -25,7 +25,7 @@ public class ChartDataEntry: NSObject
     /// optional spot for additional data this Entry represents
     public var data: AnyObject?
 
-    public override init()
+    public override required init()
     {
         super.init()
     }
@@ -90,7 +90,13 @@ public class ChartDataEntry: NSObject
 
     public func copyWithZone(zone: NSZone) -> AnyObject
     {
-        return ChartDataEntry(value: value, xIndex: xIndex, data: data)
+        let copy = self.dynamicType.init()
+
+        copy.value = value
+        copy.xIndex = xIndex
+        copy.data = data
+
+        return copy
     }
 }
 

Charts/Classes/Data/ChartDataSet.swift

@@ -56,7 +56,7 @@ public class ChartDataSet: NSObject
     /// - returns: true if value highlighting is enabled for this dataset
     public var isHighlightEnabled: Bool { return highlightEnabled }
 
-    public override init()
+    public override required init()
     {
         super.init()
     }
@@ -532,7 +532,8 @@ public class ChartDataSet: NSObject
 
     public func copyWithZone(zone: NSZone) -> AnyObject
     {
-        let copy = ChartDataSet()
+        let copy = self.dynamicType.init()
+
         copy.colors = colors
         copy._yVals = _yVals
         copy._yMax = _yMax
@@ -541,6 +542,7 @@ public class ChartDataSet: NSObject
         copy._lastStart = _lastStart
         copy._lastEnd = _lastEnd
         copy.label = label
+
         return copy
     }
 }

Charts/Classes/Data/LineChartDataSet.swift

@@ -34,7 +34,7 @@ public class LineChartDataSet: LineRadarChartDataSet
 
     public var drawCircleHoleEnabled = true
 
-    public override init()
+    public required init()
     {
         super.init()
         circleColors.append(UIColor(red: 140.0/255.0, green: 234.0/255.0, blue: 255.0/255.0, alpha: 1.0))

Charts/Classes/Data/PieChartDataSet.swift

@@ -23,7 +23,7 @@ public class PieChartDataSet: ChartDataSet
     /// indicates the selection distance of a pie slice
     public var selectionShift = CGFloat(18.0)
 
-    public override init()
+    public required init()
     {
         super.init()
 

Charts/Classes/Data/RadarChartDataSet.swift

@@ -17,7 +17,7 @@ import UIKit
 
 public class RadarChartDataSet: LineRadarChartDataSet
 {
-    public override init()
+    public required init()
     {
         super.init()