From 45383a1c1035a9ad2b2ebcb52056f13bc6eb4d5a Mon Sep 17 00:00:00 2001
From: Gustav Sundin <gustav@kicksort.se>
Date: Thu, 19 May 2016 13:24:05 +0200
Subject: [PATCH] Enables inverted ranges (ie, 100->0 instead of 0->100)

---
 RangeSlider/RangeSlider.swift    | 22 ++++++++--------------
 RangeSlider/ViewController.swift |  8 +++++++-
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/RangeSlider/RangeSlider.swift b/RangeSlider/RangeSlider.swift
index 16c814f..52e1748 100755
--- a/RangeSlider/RangeSlider.swift
+++ b/RangeSlider/RangeSlider.swift
@@ -76,18 +76,12 @@ class RangeSliderThumbLayer: CALayer {
 @IBDesignable
 class RangeSlider: UIControl {
     @IBInspectable var minimumValue: Double = 0.0 {
-        willSet(newValue) {
-            assert(newValue < maximumValue, "RangeSlider: minimumValue should be lower than maximumValue")
-        }
         didSet {
             updateLayerFrames()
         }
     }
     
     @IBInspectable var maximumValue: Double = 1.0 {
-        willSet(newValue) {
-            assert(newValue > minimumValue, "RangeSlider: maximumValue should be greater than minimumValue")
-        }
         didSet {
             updateLayerFrames()
         }
@@ -95,18 +89,12 @@ class RangeSlider: UIControl {
     
     @IBInspectable var lowerValue: Double = 0.2 {
         didSet {
-            if lowerValue < minimumValue {
-                lowerValue = minimumValue
-            }
             updateLayerFrames()
         }
     }
     
     @IBInspectable var upperValue: Double = 0.8 {
         didSet {
-            if upperValue > maximumValue {
-                upperValue = maximumValue
-            }
             updateLayerFrames()
         }
     }
@@ -253,9 +241,15 @@ class RangeSlider: UIControl {
         
         // Update the values
         if lowerThumbLayer.highlighted {
-            lowerValue = boundValue(lowerValue + deltaValue, toLowerValue: minimumValue, upperValue: upperValue - gapBetweenThumbs)
+            // Find out if the slider is using a normal or an inverted scale, and set the bounds appropriatley
+            let lowerBound = minimumValue < maximumValue ? minimumValue : upperValue - gapBetweenThumbs
+            let upperBound = minimumValue < maximumValue ? upperValue - gapBetweenThumbs : minimumValue
+            lowerValue = boundValue(lowerValue + deltaValue, toLowerValue: lowerBound, upperValue: upperBound)
         } else if upperThumbLayer.highlighted {
-            upperValue = boundValue(upperValue + deltaValue, toLowerValue: lowerValue + gapBetweenThumbs, upperValue: maximumValue)
+            // Find out if the slider is using a normal or an inverted scale, and set the bounds appropriatley
+            let lowerBound = minimumValue < maximumValue ? lowerValue + gapBetweenThumbs : maximumValue
+            let upperBound = minimumValue < maximumValue ? maximumValue : lowerValue + gapBetweenThumbs
+            upperValue = boundValue(upperValue + deltaValue, toLowerValue: lowerBound, upperValue: upperBound)
         }
         
         sendActionsForControlEvents(.ValueChanged)
diff --git a/RangeSlider/ViewController.swift b/RangeSlider/ViewController.swift
index e324e86..85c3772 100755
--- a/RangeSlider/ViewController.swift
+++ b/RangeSlider/ViewController.swift
@@ -18,10 +18,16 @@ class ViewController: UIViewController {
         rangeSlider2.trackHighlightTintColor = UIColor.redColor()
         rangeSlider2.curvaceousness = 0.0
         
+        // Make rangeSlider 2 use an inverted scale (100->0)
+        rangeSlider2.minimumValue = 100
+        rangeSlider2.maximumValue = 0
+        rangeSlider2.lowerValue = 100
+        
         view.addSubview(rangeSlider1)
         view.addSubview(rangeSlider2)
         
-        rangeSlider1.addTarget(self, action: "rangeSliderValueChanged:", forControlEvents: .ValueChanged)
+        rangeSlider1.addTarget(self, action: #selector(rangeSliderValueChanged), forControlEvents: .ValueChanged)
+        rangeSlider2.addTarget(self, action: #selector(rangeSliderValueChanged), forControlEvents: .ValueChanged)
     }
     
     override func viewDidLayoutSubviews() {