     override func viewDidLoad() {
         navigationItem.title = "tableViewDemo"
         view.addSubview(tableView)
-        sourceDatas = ["LFL","DragonLi","tableView","Do not Click item"]
+        sourceDatas = ["LFL","DragonLi","tableView","Do not Click item","LFL","DragonLi","tableView","Do not Click item","LFL","DragonLi","tableView","Do not Click item"]
         tableView.reloadData()
     }
     


//MARK:UITableView Delegates
extension ViewController : UITableViewDataSource ,UITableViewDelegate{
    
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat{
        return 120;


class ViewController: UIViewController {
    
    fileprivate  var sourceDatas = [String]()
    fileprivate var loadPageDatas = [String]()
    lazy var tableView: UITableView = {
        let tableView = UITableView(frame: CGRect(x: 0, y: 74, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
        tableView.backgroundColor = .white
