Moved xAxis getter

Charts/Classes/Charts/BarLineChartViewBase.swift

@@ -1688,14 +1688,6 @@ public class BarLineChartViewBase: ChartViewBase, BarLineScatterCandleBubbleChar
             return _rightAxis
         }
     }
-
-    /// - returns: the object representing all x-labels, this method can be used to
-    /// acquire the XAxis object and modify it (e.g. change the position of the
-    /// labels)
-    public var xAxis: ChartXAxis
-    {
-        return _xAxis
-    }
 
     /// flag that indicates if pinch-zoom is enabled. if true, both x and y axis can be scaled simultaneously with 2 fingers, if false, x and y axis can be scaled separately
     public var pinchZoomEnabled: Bool

Charts/Classes/Charts/ChartViewBase.swift

@@ -42,6 +42,14 @@ public class ChartViewBase: NSUIView, ChartDataProvider, ChartAnimatorDelegate
 {
     // MARK: - Properties
 
+    /// - returns: the object representing all x-labels, this method can be used to
+    /// acquire the XAxis object and modify it (e.g. change the position of the
+    /// labels)
+    public var xAxis: ChartXAxis
+    {
+        return _xAxis
+    }
+
     /// the default value formatter
     internal var _defaultValueFormatter: NSNumberFormatter = ChartUtils.defaultValueFormatter()
 

Charts/Classes/Charts/PieChartView.swift

@@ -79,6 +79,7 @@ public class PieChartView: PieRadarChartViewBase
         super.initialize()
 
         renderer = PieChartRenderer(chart: self, animator: _animator, viewPortHandler: _viewPortHandler)
+        _xAxis = nil
     }
 
     public override func drawRect(rect: CGRect)
@@ -245,6 +246,12 @@ public class PieChartView: PieRadarChartViewBase
         return CGFloat(value) / CGFloat(yValueSum) * _maxAngle
     }
 
+    /// This will throw an exception, PieChart has no XAxis object.
+    public override var xAxis: ChartXAxis
+    {
+        fatalError("PieChart has no XAxis")
+    }
+
     public override func indexForAngle(angle: CGFloat) -> Int
     {
         // take the current angle of the chart into consideration

Charts/Classes/Charts/RadarChartView.swift

@@ -189,12 +189,6 @@ public class RadarChartView: PieRadarChartViewBase
         return _yAxis
     }
 
-    /// - returns: the object that represents all x-labels that are placed around the RadarChart.
-    public var xAxis: ChartXAxis
-    {
-        return _xAxis
-    }
-
     /// Sets the number of web-lines that should be skipped on chart web before the next one is drawn. This targets the lines that come from the center of the RadarChart.
     /// if count = 1 -> 1 line is skipped in between
     public var skipWebLineCount: Int