diff --git a/Example/rubber-range-picker.xcodeproj/project.pbxproj b/Example/rubber-range-picker.xcodeproj/project.pbxproj
index 5f19a30..a4b1374 100644
--- a/Example/rubber-range-picker.xcodeproj/project.pbxproj
+++ b/Example/rubber-range-picker.xcodeproj/project.pbxproj
@@ -10,8 +10,8 @@
 		607FACD61AFB9204008FA782 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 607FACD51AFB9204008FA782 /* AppDelegate.swift */; };
 		607FACD81AFB9204008FA782 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 607FACD71AFB9204008FA782 /* ViewController.swift */; };
 		607FACDB1AFB9204008FA782 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 607FACD91AFB9204008FA782 /* Main.storyboard */; };
-		607FACDD1AFB9204008FA782 /* Images.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 607FACDC1AFB9204008FA782 /* Images.xcassets */; };
-		607FACE01AFB9204008FA782 /* LaunchScreen.xib in Resources */ = {isa = PBXBuildFile; fileRef = 607FACDE1AFB9204008FA782 /* LaunchScreen.xib */; };
+		CE503451221B0EBC007A556B /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = CE50344F221B0EBC007A556B /* LaunchScreen.storyboard */; };
+		CEF8B755221B109F0000A3E2 /* Images.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = CEF8B754221B109F0000A3E2 /* Images.xcassets */; };
 		D68331A069F265D437D923C7 /* Pods_rubber_range_picker_Example.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = CBD78FB19F5524DBA3E861E4 /* Pods_rubber_range_picker_Example.framework */; };
 /* End PBXBuildFile section */
 
@@ -23,13 +23,13 @@
 		607FACD51AFB9204008FA782 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		607FACD71AFB9204008FA782 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
 		607FACDA1AFB9204008FA782 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
-		607FACDC1AFB9204008FA782 /* Images.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Images.xcassets; sourceTree = "<group>"; };
-		607FACDF1AFB9204008FA782 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.xib; name = Base; path = Base.lproj/LaunchScreen.xib; sourceTree = "<group>"; };
 		6950D51C745AA570E97D8B51 /* Pods-rubber-range-picker_Example.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-rubber-range-picker_Example.debug.xcconfig"; path = "Target Support Files/Pods-rubber-range-picker_Example/Pods-rubber-range-picker_Example.debug.xcconfig"; sourceTree = "<group>"; };
 		80F4B68D2372213B9E6A1537 /* Pods_rubber_range_picker_Tests.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_rubber_range_picker_Tests.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		86283CD14BECA0BA17C7955E /* Pods-rubber-range-picker_Tests.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-rubber-range-picker_Tests.debug.xcconfig"; path = "Target Support Files/Pods-rubber-range-picker_Tests/Pods-rubber-range-picker_Tests.debug.xcconfig"; sourceTree = "<group>"; };
 		CB4FC64D813F0522779A2DB9 /* Pods-rubber-range-picker_Tests.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-rubber-range-picker_Tests.release.xcconfig"; path = "Target Support Files/Pods-rubber-range-picker_Tests/Pods-rubber-range-picker_Tests.release.xcconfig"; sourceTree = "<group>"; };
 		CBD78FB19F5524DBA3E861E4 /* Pods_rubber_range_picker_Example.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_rubber_range_picker_Example.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		CE503450221B0EBC007A556B /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
+		CEF8B754221B109F0000A3E2 /* Images.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Images.xcassets; sourceTree = "<group>"; };
 		EC14AE661B72A2C3A43980F0 /* Pods-rubber-range-picker_Example.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-rubber-range-picker_Example.release.xcconfig"; path = "Target Support Files/Pods-rubber-range-picker_Example/Pods-rubber-range-picker_Example.release.xcconfig"; sourceTree = "<group>"; };
 		F04E529041432A7AECAFAB79 /* README.md */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = net.daringfireball.markdown; name = README.md; path = ../README.md; sourceTree = "<group>"; };
 /* End PBXFileReference section */
@@ -79,11 +79,11 @@
 		607FACD21AFB9204008FA782 /* Example for rubber-range-picker */ = {
 			isa = PBXGroup;
 			children = (
+				CEF8B754221B109F0000A3E2 /* Images.xcassets */,
+				CE50344F221B0EBC007A556B /* LaunchScreen.storyboard */,
 				607FACD51AFB9204008FA782 /* AppDelegate.swift */,
 				607FACD71AFB9204008FA782 /* ViewController.swift */,
 				607FACD91AFB9204008FA782 /* Main.storyboard */,
-				607FACDC1AFB9204008FA782 /* Images.xcassets */,
-				607FACDE1AFB9204008FA782 /* LaunchScreen.xib */,
 				607FACD31AFB9204008FA782 /* Supporting Files */,
 			);
 			name = "Example for rubber-range-picker";
@@ -179,9 +179,9 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				CEF8B755221B109F0000A3E2 /* Images.xcassets in Resources */,
+				CE503451221B0EBC007A556B /* LaunchScreen.storyboard in Resources */,
 				607FACDB1AFB9204008FA782 /* Main.storyboard in Resources */,
-				607FACE01AFB9204008FA782 /* LaunchScreen.xib in Resources */,
-				607FACDD1AFB9204008FA782 /* Images.xcassets in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -255,12 +255,12 @@
 			name = Main.storyboard;
 			sourceTree = "<group>";
 		};
-		607FACDE1AFB9204008FA782 /* LaunchScreen.xib */ = {
+		CE50344F221B0EBC007A556B /* LaunchScreen.storyboard */ = {
 			isa = PBXVariantGroup;
 			children = (
-				607FACDF1AFB9204008FA782 /* Base */,
+				CE503450221B0EBC007A556B /* Base */,
 			);
-			name = LaunchScreen.xib;
+			name = LaunchScreen.storyboard;
 			sourceTree = "<group>";
 		};
 /* End PBXVariantGroup section */
diff --git a/Example/rubber-range-picker/Base.lproj/LaunchScreen.storyboard b/Example/rubber-range-picker/Base.lproj/LaunchScreen.storyboard
new file mode 100644
index 0000000..24acd6f
--- /dev/null
+++ b/Example/rubber-range-picker/Base.lproj/LaunchScreen.storyboard
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="cuberto-logo" translatesAutoresizingMaskIntoConstraints="NO" id="B6d-jx-IgH">
+                                <rect key="frame" x="30" y="319.5" width="315" height="28"/>
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="0.0" green="0.30196078431372547" blue="0.82352941176470584" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="B6d-jx-IgH" secondAttribute="trailing" constant="15" id="Luc-oq-mkv"/>
+                            <constraint firstItem="B6d-jx-IgH" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="eKC-SC-fdP"/>
+                            <constraint firstItem="B6d-jx-IgH" firstAttribute="leading" relation="greaterThanOrEqual" secondItem="6Tk-OE-BBY" secondAttribute="leading" constant="15" id="nww-b7-9Ih"/>
+                            <constraint firstItem="B6d-jx-IgH" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="oLF-8i-FoN"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="52" y="374.66266866566718"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="cuberto-logo" width="315" height="28"/>
+    </resources>
+</document>
diff --git a/Example/rubber-range-picker/Base.lproj/LaunchScreen.xib b/Example/rubber-range-picker/Base.lproj/LaunchScreen.xib
deleted file mode 100644
index 474efec..0000000
--- a/Example/rubber-range-picker/Base.lproj/LaunchScreen.xib
+++ /dev/null
@@ -1,46 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="13771" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES">
-    <device id="retina4_7" orientation="portrait">
-        <adaptation id="fullscreen"/>
-    </device>
-    <dependencies>
-        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13772"/>
-        <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
-        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
-    </dependencies>
-    <objects>
-        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
-        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
-        <view contentMode="scaleToFill" id="iN0-l3-epB">
-            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
-            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-            <subviews>
-                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="  Copyright (c) 2015 CocoaPods. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
-                    <rect key="frame" x="20" y="439" width="441" height="21"/>
-                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                    <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
-                    <nil key="highlightedColor"/>
-                </label>
-                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="rubber-range-picker" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
-                    <rect key="frame" x="20" y="140" width="441" height="43"/>
-                    <fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
-                    <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
-                    <nil key="highlightedColor"/>
-                </label>
-            </subviews>
-            <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
-            <constraints>
-                <constraint firstItem="kId-c2-rCX" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="bottom" multiplier="1/3" constant="1" id="5cJ-9S-tgC"/>
-                <constraint firstAttribute="centerX" secondItem="kId-c2-rCX" secondAttribute="centerX" id="Koa-jz-hwk"/>
-                <constraint firstAttribute="bottom" secondItem="8ie-xW-0ye" secondAttribute="bottom" constant="20" id="Kzo-t9-V3l"/>
-                <constraint firstItem="8ie-xW-0ye" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="MfP-vx-nX0"/>
-                <constraint firstAttribute="centerX" secondItem="8ie-xW-0ye" secondAttribute="centerX" id="ZEH-qu-HZ9"/>
-                <constraint firstItem="kId-c2-rCX" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="fvb-Df-36g"/>
-            </constraints>
-            <nil key="simulatedStatusBarMetrics"/>
-            <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
-            <point key="canvasLocation" x="548" y="455"/>
-        </view>
-    </objects>
-</document>
diff --git a/Example/rubber-range-picker/Base.lproj/Main.storyboard b/Example/rubber-range-picker/Base.lproj/Main.storyboard
index a97fac5..f246b79 100644
--- a/Example/rubber-range-picker/Base.lproj/Main.storyboard
+++ b/Example/rubber-range-picker/Base.lproj/Main.storyboard
@@ -13,7 +13,7 @@
         <!--View Controller-->
         <scene sceneID="VqA-9e-wDd">
             <objects>
-                <viewController id="Ru6-JY-jIt" customClass="ViewController" customModule="rubberRangePickerSample" customModuleProvider="target" sceneMemberID="viewController">
+                <viewController id="Ru6-JY-jIt" customClass="ViewController" customModule="rubber_range_picker_Example" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="Of8-os-NSq">
                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
diff --git a/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Contents.json b/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Contents.json
index 7006c9e..c7f26a4 100644
--- a/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Contents.json
+++ b/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Contents.json
@@ -31,13 +31,15 @@
       "scale" : "3x"
     },
     {
-      "idiom" : "iphone",
       "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon_60@2x.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "iphone",
       "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon_60@3x.png",
       "scale" : "3x"
     },
     {
@@ -50,4 +52,4 @@
     "version" : 1,
     "author" : "xcode"
   }
-}
+}
\ No newline at end of file
diff --git a/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Icon_60@2x.png b/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Icon_60@2x.png
new file mode 100644
index 0000000..08b120f
Binary files /dev/null and b/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Icon_60@2x.png differ
diff --git a/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Icon_60@3x.png b/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Icon_60@3x.png
new file mode 100644
index 0000000..0fd4ca2
Binary files /dev/null and b/Example/rubber-range-picker/Images.xcassets/AppIcon.appiconset/Icon_60@3x.png differ
diff --git a/Example/rubber-range-picker/Images.xcassets/Contents.json b/Example/rubber-range-picker/Images.xcassets/Contents.json
new file mode 100644
index 0000000..da4a164
--- /dev/null
+++ b/Example/rubber-range-picker/Images.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/Contents.json b/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/Contents.json
new file mode 100644
index 0000000..cf0fd58
--- /dev/null
+++ b/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/Contents.json
@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "cuberto-logo.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "cuberto-logo@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "cuberto-logo@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/cuberto-logo.png b/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/cuberto-logo.png
new file mode 100644
index 0000000..dd33fa3
Binary files /dev/null and b/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/cuberto-logo.png differ
diff --git a/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/cuberto-logo@2x.png b/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/cuberto-logo@2x.png
new file mode 100644
index 0000000..c0d96dd
Binary files /dev/null and b/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/cuberto-logo@2x.png differ
diff --git a/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/cuberto-logo@3x.png b/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/cuberto-logo@3x.png
new file mode 100644
index 0000000..785b76a
Binary files /dev/null and b/Example/rubber-range-picker/Images.xcassets/cuberto-logo.imageset/cuberto-logo@3x.png differ
diff --git a/Example/rubber-range-picker/en.lproj/LaunchScreen.strings b/Example/rubber-range-picker/en.lproj/LaunchScreen.strings
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/Example/rubber-range-picker/en.lproj/LaunchScreen.strings
@@ -0,0 +1 @@
+
diff --git a/README.md b/README.md
index 2122128..5ce082f 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ Cuberto is a leading digital agency with solid design and development expertise.
 [![CocoaPods](https://img.shields.io/cocoapods/v/rubber-range-picker.svg?style=flat)](http://cocoapods.org/pods/rubber-range-picker)
 [![Swift 4.2](https://img.shields.io/badge/Swift-4.2-green.svg?style=flat)](https://developer.apple.com/swift/)
 
-<!-- ![Animation](https://raw.githubusercontent.com/Cuberto/liquid-swipe/master/Screenshots/animation.gif) -->
+![Animation](https://raw.githubusercontent.com/Cuberto/rubber-range-picker/master/Screenshots/animation.gif)
 
 ## Example
 
diff --git a/Screenshots/animation.gif b/Screenshots/animation.gif
new file mode 100644
index 0000000..192fe38
Binary files /dev/null and b/Screenshots/animation.gif differ
diff --git a/rubber-range-picker/Classes/RubberRangePicker.swift b/rubber-range-picker/Classes/RubberRangePicker.swift
index 0a278fb..6fb8d14 100644
--- a/rubber-range-picker/Classes/RubberRangePicker.swift
+++ b/rubber-range-picker/Classes/RubberRangePicker.swift
@@ -96,6 +96,8 @@ import UIKit
         }
     }
     
+    @IBInspectable open var enableValueStep: Bool = false
+    @IBInspectable open var stepValue: Double = 1.0
     
     private var trackLayer = RubberTrackLayer()
     private var lowerThumb = RubberRangeThumb()
@@ -172,9 +174,15 @@ import UIKit
         if movingLower {
             lowerValue = bound(value: lowerValue + deltaValue, toLowerValue: minimumValue, upperValue: maximumValue)
             upperValue = max(upperValue, lowerValue)
+            if enableValueStep == true {
+                lowerValue = Double(roundf(Float(lowerValue / stepValue))) * stepValue
+            }
         } else if movingUpper {
             upperValue = bound(value: upperValue + deltaValue, toLowerValue: minimumValue, upperValue: maximumValue)
             lowerValue = min(upperValue, lowerValue)
+            if enableValueStep == true {
+                upperValue = Double(roundf(Float(upperValue / stepValue))) * stepValue
+            }
         }
         
         let touchOffset = (location.y - bounds.height/2.0)