diff --git a/README.md b/README.md
index 032cc1e..8742566 100755
--- a/README.md
+++ b/README.md
@@ -3,8 +3,8 @@
 
 [![Swift Version][swift-image]][swift-url]
 [![License MIT](https://img.shields.io/badge/license-MIT-green.svg?style=flat)](https://raw.githubusercontent.com/TBXark/TKRubberIndicator/master/LICENSE)
-[![CocoaPods](http://img.shields.io/cocoapods/v/TKRubberPageControl.svg?style=flat)](http://cocoapods.org/?q= TKRubberPageControl)
-[![CocoaPods](http://img.shields.io/cocoapods/p/TKRubberPageControl.svg?style=flat)](http://cocoapods.org/?q= TKRubberPageControl)
+[![CocoaPods](http://img.shields.io/cocoapods/v/TKRubberPageControl.svg?style=flat)](http://cocoapods.org/?q=TKRubberPageControl)
+[![CocoaPods](http://img.shields.io/cocoapods/p/TKRubberPageControl.svg?style=flat)](http://cocoapods.org/?q=TKRubberPageControl)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
 [![Support](https://img.shields.io/badge/support-iOS%208%2B%20-blue.svg?style=flat)](https://www.apple.com/nl/ios/)
 
@@ -13,9 +13,9 @@
 
 ## Requirements
 
-- Swift 3.0
+- Swift 4.0
 - iOS 8.0+
-- Xcode 8.0
+- Xcode 9.0
 
 ## Installation
 
@@ -38,7 +38,7 @@ import TKRubberPageControl
 Create a `Cartfile` that lists the framework and run `carthage update`. Follow the [instructions](https://github.com/Carthage/Carthage#if-youre-building-for-ios) to add `$(SRCROOT)/Carthage/Build/iOS/TKRubberPageControl.framework` to an iOS project.
 
 ```
-github "tbxark/TKRubberPageControl"
+github "tbxark/TKRubberIndicator"
 ```
 #### Manually
 1. Download and drop ```TKRubberPageControl.swift``` in your project.  
@@ -98,6 +98,9 @@ class ViewController: UIViewController {
 
 ## Release History
 
+* 1.4.0
+  Swift 4.0
+
 * 1.3.1
   Bug Fixed
 
diff --git a/TKRubberIndicator.xcodeproj/project.pbxproj b/TKRubberIndicator.xcodeproj/project.pbxproj
index b8d215c..a3426ef 100755
--- a/TKRubberIndicator.xcodeproj/project.pbxproj
+++ b/TKRubberIndicator.xcodeproj/project.pbxproj
@@ -184,12 +184,12 @@
 					6A555EC51BDE277B00FC36E6 = {
 						CreatedOnToolsVersion = 7.1;
 						DevelopmentTeam = 858CBVXSWP;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0900;
 					};
 					6A9103F51D539B370009451B = {
 						CreatedOnToolsVersion = 7.3.1;
 						DevelopmentTeam = 858CBVXSWP;
-						LastSwiftMigration = 0820;
+						LastSwiftMigration = 0900;
 					};
 				};
 			};
@@ -372,7 +372,8 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.TBXark.TKRubberIndicator;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -386,7 +387,8 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.TBXark.TKRubberIndicator;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -409,7 +411,8 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -434,7 +437,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.TBXark.TKRubberPageControl;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
diff --git a/TKRubberIndicator.xcodeproj/project.xcworkspace/xcuserdata/Tbxark.xcuserdatad/UserInterfaceState.xcuserstate b/TKRubberIndicator.xcodeproj/project.xcworkspace/xcuserdata/Tbxark.xcuserdatad/UserInterfaceState.xcuserstate
index cf3ccf9..b60ed69 100755
Binary files a/TKRubberIndicator.xcodeproj/project.xcworkspace/xcuserdata/Tbxark.xcuserdatad/UserInterfaceState.xcuserstate and b/TKRubberIndicator.xcodeproj/project.xcworkspace/xcuserdata/Tbxark.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/TKRubberIndicator.xcodeproj/xcuserdata/Tbxark.xcuserdatad/xcschemes/TKRubberIndicator.xcscheme b/TKRubberIndicator.xcodeproj/xcuserdata/Tbxark.xcuserdatad/xcschemes/TKRubberIndicator.xcscheme
index d20a99e..96ab6c7 100755
--- a/TKRubberIndicator.xcodeproj/xcuserdata/Tbxark.xcuserdatad/xcschemes/TKRubberIndicator.xcscheme
+++ b/TKRubberIndicator.xcodeproj/xcuserdata/Tbxark.xcuserdatad/xcschemes/TKRubberIndicator.xcscheme
@@ -26,6 +26,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -45,6 +46,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
diff --git a/TKRubberIndicator/ViewController.swift b/TKRubberIndicator/ViewController.swift
index 0298bd2..490a249 100755
--- a/TKRubberIndicator/ViewController.swift
+++ b/TKRubberIndicator/ViewController.swift
@@ -32,7 +32,7 @@ class ViewController: UIViewController {
     @IBAction func pageCountChange(_ sender: UISegmentedControl) {
         page.numberOfpage = sender.selectedSegmentIndex + 3
     }
-    func targetActionValueChange(_ page:TKRubberPageControl){
+    @objc func targetActionValueChange(_ page:TKRubberPageControl){
         print("Target-Action : Page is \(page.currentIndex)")
     }
 
diff --git a/TKRubberPageControl/TKRubberPageControl.swift b/TKRubberPageControl/TKRubberPageControl.swift
index 60235dd..179bb1e 100755
--- a/TKRubberPageControl/TKRubberPageControl.swift
+++ b/TKRubberPageControl/TKRubberPageControl.swift
@@ -14,7 +14,7 @@ import UIKit
 private enum TKMoveDirection{
     case left
     case right
-    func toBool() -> Bool{
+    func toLeft() -> Bool{
         switch self{
         case .left: 
             return true
@@ -88,21 +88,21 @@ open class TKRubberPageControl : UIControl {
     }
     
     // 手势
-    fileprivate var indexTap     : UITapGestureRecognizer?
+    private var indexTap     : UITapGestureRecognizer?
     // 所有图层
-    fileprivate var smallBubbles    = [TKBubbleCell]()
-    fileprivate var backgroundLayer = CAShapeLayer()
-    fileprivate var mainBubble      = CAShapeLayer()
-    fileprivate var backLineLayer   = CAShapeLayer()
+    private var smallBubbles    = [TKBubbleCell]()
+    private var backgroundLayer = CAShapeLayer()
+    private var mainBubble      = CAShapeLayer()
+    private var backLineLayer   = CAShapeLayer()
     
     // 大球缩放比例
-    fileprivate let bubbleScale  : CGFloat  = 1/3.0
+    private let bubbleScale  : CGFloat  = 1/3.0
     
     // 存储计算用的
-    fileprivate var xPointbegin  : CGFloat = 0
-    fileprivate var xPointEnd    : CGFloat = 0
-    fileprivate var yPointbegin  : CGFloat = 0
-    fileprivate var yPointEnd    : CGFloat = 0
+    private var xPointbegin  : CGFloat = 0
+    private var xPointEnd    : CGFloat = 0
+    private var yPointbegin  : CGFloat = 0
+    private var yPointEnd    : CGFloat = 0
     
     
     public init(frame: CGRect, count: Int, config: TKRubberPageControlConfig = TKRubberPageControlConfig()) {
@@ -118,7 +118,7 @@ open class TKRubberPageControl : UIControl {
         setUpView()
     }
     
-    fileprivate func setUpView(){
+    private func setUpView(){
         
         // 一些奇怪的位置计算
         
@@ -202,7 +202,7 @@ open class TKRubberPageControl : UIControl {
     
     
     // 手势事件
-    @objc fileprivate func tapValueChange(_ ges: UITapGestureRecognizer){
+    @objc private func tapValueChange(_ ges: UITapGestureRecognizer){
         let point = ges.location(in: self)
         if point.y > yPointbegin && point.y < yPointEnd && point.x > xPointbegin && point.x < xPointEnd{
             let index = Int(point.x - xPointbegin) / Int(styleConfig.smallBubbleMoveRadius)
@@ -211,7 +211,7 @@ open class TKRubberPageControl : UIControl {
     }
     
     // Index值变化
-    fileprivate func changIndexToValue(_ valueIndex: Int){
+    private func changIndexToValue(_ valueIndex: Int){
         var index = valueIndex
         if index >= numberOfpage { index = numberOfpage - 1 }
         if index < 0 { index = 0 }
@@ -222,7 +222,7 @@ open class TKRubberPageControl : UIControl {
         
         // 小球动画
         for index in range{
-            let smallBubbleIndex = (direction.toBool()) ? (index - 1) : (index)
+            let smallBubbleIndex = (direction.toLeft()) ? (index - 1) : (index)
             let smallBubble      = smallBubbles[smallBubbleIndex]
             smallBubble.positionChange(direction,
                                        radius: styleConfig.smallBubbleMoveRadius / 2,
@@ -268,11 +268,11 @@ open class TKRubberPageControl : UIControl {
 // MARK: - Small Bubble
 private class TKBubbleCell: CAShapeLayer, CAAnimationDelegate {
     
-    fileprivate var bubbleLayer = CAShapeLayer()
-    fileprivate let bubbleScale   : CGFloat  = 0.5
-    fileprivate var lastDirection : TKMoveDirection!
-    fileprivate var styleConfig   : TKRubberPageControlConfig
-    fileprivate var cachePosition = CGPoint.zero
+    var bubbleLayer = CAShapeLayer()
+    let bubbleScale   : CGFloat  = 0.5
+    var lastDirection : TKMoveDirection!
+    var styleConfig   : TKRubberPageControlConfig
+    var cachePosition = CGPoint.zero
     
     override init(layer: Any) {
         styleConfig = TKRubberPageControlConfig()
@@ -293,7 +293,7 @@ private class TKBubbleCell: CAShapeLayer, CAAnimationDelegate {
         setupLayer()
     }
     
-    fileprivate func setupLayer(){
+    private func setupLayer(){
         frame = CGRect(x: 0, y: 0, width: styleConfig.smallBubbleSize, height: styleConfig.smallBubbleSize)
         
         bubbleLayer.path        = UIBezierPath(ovalIn: bounds).cgPath
@@ -305,13 +305,13 @@ private class TKBubbleCell: CAShapeLayer, CAAnimationDelegate {
     }
     
     // beginTime 本来是留给小球轮播用的, 但是效果不好就没用了
-    internal func positionChange(_ direction: TKMoveDirection, radius: CGFloat, duration: CFTimeInterval, beginTime: CFTimeInterval){
+    func positionChange(_ direction: TKMoveDirection, radius: CGFloat, duration: CFTimeInterval, beginTime: CFTimeInterval){
         
-        let toLeft = direction.toBool()
+        let toLeft = direction.toLeft()
         let movePath = UIBezierPath()
         var center = CGPoint.zero
-        let startAngle = toLeft ? 0 : CGFloat(M_PI)
-        let endAngle   = toLeft ? CGFloat(M_PI) : 0
+        let startAngle = toLeft ? 0 : CGFloat.pi
+        let endAngle   = toLeft ? CGFloat.pi : 0
         center.x += radius * (toLeft ? -1 : 1)
         lastDirection = direction
         
@@ -368,7 +368,7 @@ private class TKBubbleCell: CAShapeLayer, CAAnimationDelegate {
                 CATransaction.setAnimationDuration(0) 
                 CATransaction.setDisableActions(true)
                 var point = cachePosition
-                point.x += (styleConfig.smallBubbleSize + styleConfig.bubbleXOffsetSpace) * CGFloat(lastDirection.toBool() ? -1 : 1)
+                point.x += (styleConfig.smallBubbleSize + styleConfig.bubbleXOffsetSpace) * CGFloat(lastDirection.toLeft() ? -1 : 1)
                 position = point
                 opacity = 1
                 CATransaction.commit()