如何調整ScrollViewDidScroll或UICollectionView的其他滾動視圖方法

我想調整一些scrollview方法爲我的集合/ tableview來跟蹤一些事件。我收到錯誤，因爲它無法在collectionview中找到scrollViewDidScroll：Method。我試着用下面的代碼如何調整ScrollViewDidScroll或UICollectionView的其他滾動視圖方法

extension UICollectionView 
{ 

    public override class func initialize() { 
     struct Static { 
      static var token: dispatch_once_t = 0 
     } 

     // make sure this isn't a subclass 
     if self !== UICollectionView.self { 
      return 
     } 

     dispatch_once(&Static.token) { 
      let originalSelector = #selector(self.scrollViewDidScroll(_:)) 
      let swizzledSelector = #selector(self.sp_scrollViewDidScroll(_:)) 

      let originalMethod = class_getInstanceMethod(self, originalSelector) 
      let swizzledMethod = class_getInstanceMethod(self, swizzledSelector) 

      let didAddMethod = class_addMethod(self, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod)) 

      if didAddMethod { 
       class_replaceMethod(self, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod)) 
      } else { 
       method_exchangeImplementations(originalMethod, swizzledMethod) 
      } 
     } 
    } 

    // MARK: - Method Swizzling 

    func sp_scrollViewDidScroll(scrollView:UIScrollView) { 
     self.sp_scrollViewDidScroll(animated) 
     print("Swizzled sp_scrollViewDidScroll in place of scrollViewDidScroll") 
    } 
}