Added an option to automatically hide the highlightLine

README.md

@@ -136,7 +136,11 @@ class MyViewController: UIViewController, ChartDelegate {
     }
 
     func didFinishTouchingChart(chart: Chart) {
-        // Do something when finished
+        // Do something when finished (only called after the user swipes out of the chart either on the right or the left side)
+    }
+
+    func didEndTouchingChart(chart: Chart) {
+       // Do something when the user ends touching the chart
     }
 }
 ```
@@ -196,6 +200,7 @@ There is no built-in method to update a chart. To accomplish this:
 * `delegate`: the delegate for listening to touch events.
 * `highlightLineColor`: color of the highlight line.
 * `highlightLineWidth`: width of the highlight line.
+* `shouldAutoHideHighlightLine`: automatically hide the highlightLine after we've ended touching the chart.
 * `gridColor`: the grid color.
 * `labelColor`: the color of the labels.
 * `labelFont`: the font used for the labels.

Source/Chart.swift

@@ -167,6 +167,11 @@ open class Chart: UIControl {
     Width for the highlight line.
     */
     open var highlightLineWidth: CGFloat = 0.5
+
+    /**
+     Wether we should automatically hide the highlightLine after touches have ended.
+     */
+    open var autoHideHighlightLine: Bool = false
 
     /**
     Alpha component for the area's color.
@@ -643,6 +648,8 @@ open class Chart: UIControl {
 
     fileprivate func drawHighlightLineFromLeftPosition(_ left: CGFloat) {
         if let shapeLayer = highlightShapeLayer {
+            shapeLayer.isHidden = false
+
             // Use line already created
             let path = CGMutablePath()
 
@@ -712,6 +719,7 @@ open class Chart: UIControl {
 
     override open func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
         handleTouchEvents(touches, event: event)
+        highlightShapeLayer?.isHidden = autoHideHighlightLine
         delegate?.didEndTouchingChart(self)
     }
 
@@ -790,4 +798,4 @@ open class Chart: UIControl {
         let dy2 = level - p2.y
         return (x: (p2.x * dy1 - p1.x * dy2) / (dy1 - dy2), y: level)
     }
-}
+}