如何从多个选定的行中获取数据并在另一个VC tableview单元格Swift4中显示

Question

Hello I am trying to complete my task since 2 days but still no success searched everywhere , I want to select multiple rows from tableview cells (which contains 2 labels and one image) then I want to transfer into another vc and show in tableview , I am able to select multiple rows and get this type index from selected rows but now I don't know how to get data and transfer into another vc and show in table view please help I am getting selected rows index like this [[0, 1], [0, 2], [0, 3]

VC Code

class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {


    @IBOutlet weak var tableview: UITableView!


    var labone = ["1","2","3","4","5","6"]
    var labtwo = ["a","b","c","d","e","f"]
    var img =  ["bag","bag","bag","bag","bag","bag"]


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func button(_ sender: Any) {

        let selectedindexPath = tableview.indexPathsForSelectedRows
        if(selectedindexPath != nil){
            let toy  = labone[0]
            print(toy)
            print(selectedindexPath) }

        else{
            print("null")
        }
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        return labone.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
         let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)

         let name = cell.viewWithTag(1) as! UILabel
        let name_two = cell.viewWithTag(2) as! UILabel
        let imgg = cell.viewWithTag(3) as! UIImageView

        name.text = labone[indexPath.row]
        name_two.text = labtwo[indexPath.row]
        imgg.image = UIImage(named: img[indexPath.row])


        return cell

    }
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell",for: indexPath)
        cell.contentView.backgroundColor = UIColor.yellow

    }


    func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
      let cell = tableView.dequeueReusableCell(withIdentifier: "cell")
        // let selectedCell = tableview.cellForRow(at: indexPath)
        if let label = cell?.contentView.viewWithTag(4) as? UIImageView {
            label.image = UIImage(named: "check_disable")
        }

    }

}

Answer 1

As @Rakshith suggest in their comment, move your data (labone, labtwo, img arrays) out of the view controller and into a model object. Pass that model object to your second view controller.

Also create an array selectedIndexPaths in your second view controller. When you tap the button in your ViewController , get the array of selected index paths and pass it to your second view controller.

In your second view controller's viewWillAppear , use the selectedIndexPaths variable to copy the items selected items into an array itemsToDisplay and use that in your table view data source methods to populate the second view controller's table view.

Answer 2

You should use some structure like below and then update the state of item selected or deselected then when you want to go to next viewController you can filter your dataSource with the items selected like below,

 class CellModel {

    var labelOne: String
    var labelTwo: String
    var imageName: String
    var isSelected = false

    init(_ labelOne: String, labelTwo: String, imageName: String) {
        self.labelOne = labelOne
        self.labelTwo = labelTwo
        self.imageName = imageName
    }
}

Update your viewController,

class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {

   let dataSource = [CellModel("1", labelTwo: "a", imageName: "bag"),
                     CellModel("2", labelTwo: "b", imageName: "bag"),
                     CellModel("3", labelTwo: "c", imageName: "bag"),
                     CellModel("4", labelTwo: "d", imageName: "bag"),
                     CellModel("5", labelTwo: "e", imageName: "bag"),
                     CellModel("6", labelTwo: "f", imageName: "bag")]
}

then you can update your cellForRowAt like below,

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
         let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)

       let name = cell.viewWithTag(1) as! UILabel
       let name_two = cell.viewWithTag(2) as! UILabel
       let imgg = cell.viewWithTag(3) as! UIImageView

       let model = self.dataSource[indexPath.row]
       name.text = model.labelOne
       name_two.text = model.labelTwo
       imgg.image = UIImage(named: model.imageName)

       return cell
    }

update the numberOfRowInSection with this

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {    
     return self.dataSource.count
 }

and you can update the state of model when cell is selected/deseleced like this,

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell",for: indexPath)
        cell.contentView.backgroundColor = UIColor.yellow
        self.dataSource[indexPath.row].isSelected = true
    }


    func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
      let cell = tableView.dequeueReusableCell(withIdentifier: "cell")
        // let selectedCell = tableview.cellForRow(at: indexPath)
        if let label = cell?.contentView.viewWithTag(4) as? UIImageView {
            label.image = UIImage(named: "check_disable")
            self.dataSource[indexPath.row].isSelected = false
      }
 }

and finally in button action you can filter the selected models and pass to next viewController

@IBAction func button(_ sender: Any) {

     let selectedItems = self.dataSource.filter({ $0.isSelected == true })
     // Pass to next ViewController the selectedItmes
}