iOS Simple Cool PullToRefresh Library written in pure swift

  override func viewDidLoad() {
        self.tableView.addPullToRefresh({ [weak self] in
            // refresh code
            
            self?.tableView.reloadData()
            self?.tableView.stopPullToRefresh()
        })
  }

  override func viewDidLoad() {
       let options = PullToRefreshOption()
        options.backgroundColor = UIColor.blueColor()
        options.indicatorColor = UIColor.whiteColor()
        
        self.tableView.addPullToRefresh(options: options, { [weak self] in
            // some code
            
            self?.tableView.reloadData()
            self?.tableView.stopPullToRefresh()
        })
        
  }

  func scrollViewDidScroll(scrollView: UIScrollView) {
    self.tableView.fixedPullToRefreshViewForDidScroll()
  }  

struct PullToRefreshConst {
    static let tag = 810
    static let alpha = true
    static let height: CGFloat = 80
    static let imageName: String = "pulltorefresharrow.png"
    static let animationDuration: Double = 0.4
    static let fixedTop = true // PullToRefreshView fixed Top
}

class PullToRefreshOption {
    var backgroundColor = UIColor.clearColor()
    var indicatorColor = UIColor.grayColor()
    var autoStopTime: Double = 0.7 // 0 is not auto stop
    var fixedSectionHeader = false  // Update the content inset for fixed section headers
}