Added colorReferenceLines property to alter reference line stroke color

Author: Gavin Bunney

Classes/BEMLine.h

@@ -90,7 +90,8 @@ typedef NS_ENUM(NSInteger, BEMLineAnimation) {
  @todo This property is non-functional at this point in time. It only serves as a marker for further implementation. */
 @property (assign, nonatomic) CGGradientRef gradient;
 
-
+/// The reference line color. Defaults to `color`.
+@property (strong, nonatomic) UIColor *refrenceLineColor;
 
 //----- ALPHA -----//
 

Classes/BEMLine.m

@@ -196,6 +196,11 @@ - (void)drawRect:(CGRect)rect {
 
         if (self.enableRefrenceLines == YES) {
             [referenceLinesPath setLineWidth:self.lineWidth/2];
+            
+            if (self.refrenceLineColor) {
+                [self.refrenceLineColor set];
+            }
+            
             [referenceLinesPath strokeWithBlendMode:kCGBlendModeNormal alpha:self.lineAlpha/2];
         }
     } else {
@@ -215,9 +220,15 @@ - (void)drawRect:(CGRect)rect {
             referenceLinesPathLayer.frame = self.bounds;
             referenceLinesPathLayer.path = referenceLinesPath.CGPath;
             referenceLinesPathLayer.opacity = self.lineAlpha/2;
-            referenceLinesPathLayer.strokeColor = self.color.CGColor;
             referenceLinesPathLayer.fillColor = nil;
             referenceLinesPathLayer.lineWidth = self.lineWidth/2;
+            
+            if (self.refrenceLineColor) {
+                referenceLinesPathLayer.strokeColor = self.refrenceLineColor.CGColor;
+            } else {
+                referenceLinesPathLayer.strokeColor = self.color.CGColor;
+            }
+            
             [self animateForLayer:referenceLinesPathLayer withAnimationType:self.animationType isAnimatingReferenceLine:YES];
             [self.layer addSublayer:referenceLinesPathLayer];
         }

Classes/BEMSimpleLineGraphView.h

@@ -216,6 +216,9 @@
 /// Width of the line of the graph. Default value is 1.0.
 @property (nonatomic) CGFloat widthLine;
 
+/// Color of the reference lines of the graph. Default is same color as `colorLine`.
+@property (strong, nonatomic) UIColor *colorReferenceLines;
+
 
 /// The size of the circles that represent each point. Default is 10.0.
 @property (nonatomic) CGFloat sizePoint;

Classes/BEMSimpleLineGraphView.m

@@ -441,6 +441,7 @@ - (void)drawLine {
         line.enableRefrenceFrame = self.enableReferenceAxisFrame;
 
         line.enableRefrenceLines = YES;
+        line.refrenceLineColor = self.colorReferenceLines;
         line.arrayOfVerticalRefrenceLinePoints = self.enableReferenceXAxisLines ? xAxisLabelPoints : nil;
         line.arrayOfHorizontalRefrenceLinePoints = self.enableReferenceYAxisLines ? yAxisLabelPoints : nil;
     }