Swift development Tutorial--Implement UITableView error does not conform to protocol ' Uitableviewdatasource '

Through practice, if the following three protocol methods are implemented, it will not be an error. Also need attention! The problem.

func TableView (Tableview:uitableview, Numberofrowsinsection section:int), int{
  }
func TableView (Tableview:uitableview, Cellforrowatindexpath indexpath:nsindexpath), uitableviewcell{      
  }
    
func TableView (Tableview:uitableview, Didselectrowatindexpath indexpath:nsindexpath) {

Tableview.deselectrowatindexpath (Indexpath, Animated:true)

}

Swift development Tutorial--Implement UITableView error does not conform to protocol ' Uitableviewdatasource '