arrays - 删除一项时使用用户默认值保存数组

Question

我希望我的快速代码使用用户默认值来保存数组 arr。当用户点击 tableview 单元格上的删除按钮时，它会删除该单元格和标签。我还想在 func 句柄寄存器中做的是从数组 arr 中删除数字，所以如果显示单元格 2 的单元格被删除，我想从数组 arr 中删除 2 个。当应用程序关闭时，它应该只保存未删除的号码。就像下图代表之前和

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

  var arr = [0,1,2,3,4]
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return arr.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
       let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! customtv
       cell.lbl.text = "\(arr[indexPath.row])"
       cell.deleteBTN.tag = indexPath.row
       cell.deleteBTN.addTarget(self, action:#selector(handleRegister(_:)), for: .touchUpInside)
       return cell
    }
    @objc func handleRegister(_ sender: UIButton){
         arr.remove(at:sender.tag)
         tableView.deleteRows(at:[IndexPath(row:sender.tag,section:0)],with:.none)
        
        let defaults = UserDefaults.standard
        defaults.set(arr, forKey: "arrNum")
    }

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat { 118 }

    var tableView = UITableView()
    var selectedIndexPath = IndexPath(row: 0, section: 0)

    override func viewDidLoad() {
        super.viewDidLoad()

        setTableVIew()
    }


    func setTableVIew(){
    
          
         
       
        
        let VCframe = view.frame
        let height = VCframe.height * 0.8
           
        let widthx = VCframe.width

   
             tableView.frame = CGRect(x: 10, y: 0, width: widthx - 20, height: height)
          
        tableView.delegate = self
        tableView.dataSource = self
        view.addSubview(tableView)
  
      
        tableView.register(customtv.self, forCellReuseIdentifier: "cell")
    }
 




    
}
class customtv: UITableViewCell {
    lazy var backView : UIView = {
      let view = UIView(frame: CGRect(x: 10, y: 6, width: self.frame.width  , height: 110))
      view.backgroundColor = .green
      print(self.frame.width)
          return view
      }()
      

      
      override func layoutSubviews() {
         backView.clipsToBounds = true
         backView.frame =  CGRect(x: 0, y: 6, width: bounds.maxX  , height: 110)
   

      }
    lazy var lbl : UILabel = {
        let press = UILabel(frame: CGRect(x: 0, y: 3, width: 120 , height: 50))
        press.backgroundColor = .yellow
        press.text = String("1")
            
        return press
    }()

   
 


 
    lazy var deleteBTN : UIButton = {
        let press = UIButton(frame: CGRect(x: 200, y: 3, width: 65 , height: 50))
        press.backgroundColor = .systemBlue
        press.setTitle("DELETE", for: .normal)

        return press
    }()

 
override func setSelected(_ selected: Bool, animated: Bool) {
    super.setSelected(animated, animated: true)
    addSubview(backView)
    backView.addSubview(deleteBTN)
    backView.addSubview(lbl)
}

}

标签： arraysswiftuitableviewtagsnsuserdefaults