diff --git a/PullToRefreshSwift.podspec b/PullToRefreshSwift.podspec
index 64df143..929580b 100644
--- a/PullToRefreshSwift.podspec
+++ b/PullToRefreshSwift.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "PullToRefreshSwift"
-  s.version      = "3.0.3"
+  s.version      = "3.0.4"
   s.summary      = "iOS Simple PullToRefresh Library."
   s.homepage     = "https://github.com/dekatotoro/PullToRefreshSwift"
   s.license      = { :type => "MIT", :file => "LICENSE" }
diff --git a/Source/PullToRefreshView.swift b/Source/PullToRefreshView.swift
index 28658f7..b825ec3 100755
--- a/Source/PullToRefreshView.swift
+++ b/Source/PullToRefreshView.swift
@@ -26,7 +26,7 @@ open class PullToRefreshView: UIView {
     fileprivate var arrow: UIImageView
     fileprivate var indicator: UIActivityIndicatorView
     fileprivate var scrollViewInsets: UIEdgeInsets = UIEdgeInsets.zero
-    fileprivate var refreshCompletion: ((Void) -> Void)?
+    fileprivate var refreshCompletion: (() -> Void)?
     fileprivate var pull: Bool = true
     
     fileprivate var positionY:CGFloat = 0 {
@@ -78,7 +78,7 @@ open class PullToRefreshView: UIView {
         fatalError("init(coder:) has not been implemented")
     }
     
-    public init(options: PullToRefreshOption, frame: CGRect, refreshCompletion :((Void) -> Void)?, down:Bool=true) {
+    public init(options: PullToRefreshOption, frame: CGRect, refreshCompletion :(() -> Void)?, down:Bool=true) {
         self.options = options
         self.refreshCompletion = refreshCompletion
 
@@ -262,7 +262,7 @@ open class PullToRefreshView: UIView {
     fileprivate func arrowRotation() {
         UIView.animate(withDuration: 0.2, delay: 0, options:[], animations: {
             // -0.0000001 for the rotation direction control
-            self.arrow.transform = CGAffineTransform(rotationAngle: CGFloat(M_PI-0.0000001))
+            self.arrow.transform = CGAffineTransform(rotationAngle: CGFloat(Double.pi-0.0000001))
         }, completion:nil)
     }
     
diff --git a/Source/UIScrollViewExtension.swift b/Source/UIScrollViewExtension.swift
index 249fe52..6c1641d 100755
--- a/Source/UIScrollViewExtension.swift
+++ b/Source/UIScrollViewExtension.swift
@@ -14,14 +14,14 @@ public extension UIScrollView {
         return pullToRefreshView as? PullToRefreshView
     }
     
-    public func addPullRefresh(options: PullToRefreshOption = PullToRefreshOption(), refreshCompletion :((Void) -> Void)?) {
+    public func addPullRefresh(options: PullToRefreshOption = PullToRefreshOption(), refreshCompletion :(() -> Void)?) {
         let refreshViewFrame = CGRect(x: 0, y: -PullToRefreshConst.height, width: self.frame.size.width, height: PullToRefreshConst.height)
         let refreshView = PullToRefreshView(options: options, frame: refreshViewFrame, refreshCompletion: refreshCompletion)
         refreshView.tag = PullToRefreshConst.pullTag
         addSubview(refreshView)
     }
     
-    public func addPushRefresh(options: PullToRefreshOption = PullToRefreshOption(), refreshCompletion :((Void) -> Void)?) {
+    public func addPushRefresh(options: PullToRefreshOption = PullToRefreshOption(), refreshCompletion :(() -> Void)?) {
         let refreshViewFrame = CGRect(x: 0, y: contentSize.height, width: self.frame.size.width, height: PullToRefreshConst.height)
         let refreshView = PullToRefreshView(options: options, frame: refreshViewFrame, refreshCompletion: refreshCompletion,down: false)
         refreshView.tag = PullToRefreshConst.pushTag