I want to empty the value of the guard array.

import UIKit

classHistoryViewController:UIViewController, UITableViewDelegate, UITableViewDataSource{
    
    
    @IBOutlet weak var historyTableView: UITableView!
    
    var saveArray: String = [ ]
    vartextFieldValue: String=""
    
    override func viewDidLoad(){
        super.viewDidLoad()
        title="History"
    }
    
　　　　　　　　// From here
    override func viewWillAppear(_animated:Bool){
        super.viewWillAppear(animated)
        guardlet saveList=UserDefaults.standard.array(forKey: "history") as?[String] else{
            print("No Value"")
            return
        }

        if saveArray==[]{
            print(saveList) 
//            saveList=[] // I tried to put an empty array, but it didn't work.
        }
        
        saveArray=saveList.reversed()

        self.historyTableView.reloadData()
        
    }
    
    @ IBAction func deleteButton(_sender:Any){

        UserDefaults.standard.removeObject(forKey: "history")
        I deleted the contents of saveArray.removeAll()//saveArray, but the tasks stored in saveList are displayed.
        historyTableView.reloadData()
    }
    
    functableView(_tableView:UITableView, numberOfRowsInSection section:Int) - > Int{
        //        print(self.memoryArrayReversed.count)
//        print(saveArray.count)
        return saveArray.count
    }
    
    functableView(_tableView:UITableView, cellForRowAtindexPath:IndexPath) - >UITableViewCell{
        
        letcell=historyTableView.dueReusableCell(withIdentifier: "Cell")!
        cell.textLabel?.text=saveArray [indexPath.item]
//        cell.textLabel?.numberOfLines=0
        return cell
    }
    
    // Cell Removal Features
    functableView(_tableView:UITableView, commit editingStyle:UITableViewCell.EditingStyle, forRowAtindexPath:IndexPath){
        ifeditingStyle==UITableViewCell.EditingStyle.delete{
            print(saveArray)
            saveArray.remove(at:indexPath.row)
            historyTableView.deleteRows(at:[indexPath as IndexPath], with:UITableView.RowAnimation.automatic)
            // adding:saving deleted content
            UserDefaults.standard.set(saveArray, forKey: "history")
        }
    }
}