diff --git a/Charts/Classes/Charts/BarLineChartViewBase.swift b/Charts/Classes/Charts/BarLineChartViewBase.swift
index 6b60920257..dc592ceb59 100644
--- a/Charts/Classes/Charts/BarLineChartViewBase.swift
+++ b/Charts/Classes/Charts/BarLineChartViewBase.swift
@@ -74,7 +74,7 @@ public class BarLineChartViewBase: ChartViewBase, UIGestureRecognizerDelegate
         super.init(frame: frame)
     }
     
-    public required init?(coder aDecoder: NSCoder)
+    public required init(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
     }
diff --git a/Charts/Classes/Charts/ChartViewBase.swift b/Charts/Classes/Charts/ChartViewBase.swift
index 841f7d5d60..c144dedca9 100755
--- a/Charts/Classes/Charts/ChartViewBase.swift
+++ b/Charts/Classes/Charts/ChartViewBase.swift
@@ -143,7 +143,7 @@ public class ChartViewBase: UIView, ChartAnimatorDelegate
         initialize()
     }
     
-    public required init?(coder aDecoder: NSCoder)
+    public required init(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
         initialize()
@@ -828,7 +828,7 @@ public class ChartViewBase: UIView, ChartAnimatorDelegate
     internal typealias VoidClosureType = () -> ()
     internal var _sizeChangeEventActions = [VoidClosureType]()
     
-    override public func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String: AnyObject]?, context: UnsafeMutablePointer<Void>)
+    public override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [NSObject : AnyObject]?, context: UnsafeMutablePointer<Void>)
     {
         if (keyPath == "bounds" || keyPath == "frame")
         {
diff --git a/Charts/Classes/Charts/PieChartView.swift b/Charts/Classes/Charts/PieChartView.swift
index f11aa1dac9..502d5a9cec 100755
--- a/Charts/Classes/Charts/PieChartView.swift
+++ b/Charts/Classes/Charts/PieChartView.swift
@@ -31,7 +31,7 @@ public class PieChartView: PieRadarChartViewBase
         super.init(frame: frame)
     }
     
-    public required init?(coder aDecoder: NSCoder)
+    public required init(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
     }
diff --git a/Charts/Classes/Charts/PieRadarChartViewBase.swift b/Charts/Classes/Charts/PieRadarChartViewBase.swift
index aaba8de186..826ae5827f 100755
--- a/Charts/Classes/Charts/PieRadarChartViewBase.swift
+++ b/Charts/Classes/Charts/PieRadarChartViewBase.swift
@@ -37,7 +37,7 @@ public class PieRadarChartViewBase: ChartViewBase
         super.init(frame: frame)
     }
     
-    public required init?(coder aDecoder: NSCoder)
+    public required init(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
     }
diff --git a/Charts/Classes/Charts/RadarChartView.swift b/Charts/Classes/Charts/RadarChartView.swift
index bbcc0f1d9c..31ddfb6dac 100644
--- a/Charts/Classes/Charts/RadarChartView.swift
+++ b/Charts/Classes/Charts/RadarChartView.swift
@@ -51,7 +51,7 @@ public class RadarChartView: PieRadarChartViewBase
         super.init(frame: frame)
     }
     
-    public required init?(coder aDecoder: NSCoder)
+    public required init(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
     }