传递给另一个 UIViewController 的 TableCell 数据 [英] TableCell Data passing to another UIViewController

问题描述

我有一个表，它将 SQL 中的数据填充到 TableCell 中.当我单击一个单元格时，我希望将仅 特定单元格的数据传递给不同的 UIViewController.数据包括字符串.我该怎么做?

I have a Table which populates data from SQL into TableCells. When i click on a Cell, I want the data of only that particular cell to be passed to a different UIViewController. Data includes Strings. How do I go about this?

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开始场景-

Table View Controller(嵌入在 UINavigationController 中)- 这是我们打开应用程序时将看到的第一个 ViewController，我们希望他将数据传输到我们的目标视图控制器

Table View Controller (embedded in UINavigationController) - that's the first ViewController we'll see when we'll open the app, we want him to transfer data to our Destination View Controller

目标视图控制器- 这是我们在选择单元格后将到达的视图控制器.

Destination View Controller- that's the ViewController we'll reach after selecting a cell.

您可以在下面的 GIF 中看到，我已经设置了从 TableViewCell 到目标视图控制器的 segue，segue 的标识符是 toDestination(拖动时看不到 蓝线? 按住 ctrl 这样做)

You can see in the following GIF that I've set a segue from our TableViewCell to Destination View Controller, the segue's identifier is toDestination (can't see the blue line when dragging? hold ctrl while doing that)

这就是你的故事板场景应该是什么样子-

That's how your storyboard scene should look like-

(不要忘记设置单元格的重用标识符，以便稍后在代码中使用)

(don't forget to set your cell's reuse identifier so you can use it later in code)

现在让我们深入研究代码:

Now lets dive into code:

在我们的 TableViewController 中，我们编写了这个函数:

In our TableViewController we write this function:

// Here we're transfering the data we want to our DestinationViewController
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if let destinationVC = segue.destination as? DestinationViewController{

        if let pressedIndexPath = tableView.indexPathForSelectedRow{
            // passed string is just some variable I've declared on DestinationViewController
            destinationVC.passedString = dataHolder[pressedIndexPath.row]
        }
    }
}

你什么时候调用过这个函数?-我没有调用它，它被自动调用，因为我已经使用我们的故事板在我们的单元格和 DestinationViewController 之间设置了一个 segue(还记得起始场景吗?...)，现在每次用户按下该单元格时，segue 都会自动启动这个函数正在被调用

When did you even call this function?- I didn't call it, it's being called automatically because I've set a segue between our cell to our DestinationViewController using our storyboard (remember the starting scene?...), now every time the user presses that cell a segue starts automatically and this function is being called

我们的 DestinationViewController 端看起来像这样-

Our DestinationViewController side looks like that-

class DestinationViewController: UIViewController {

      @IBOutlet weak var label: UILabel!

      var passedString: String!

       override func viewDidLoad() {
          super.viewDidLoad()

          label.text = passedString
       }
}

我们完成了，这是最终结果

We're done, here's the final result

完整代码:

class TableViewController: UITableViewController {

   let dataHolder = ["string1", "string2", "string3", "string4"]

   override func numberOfSections(in tableView: UITableView) -> Int { return 1 }

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


   override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

       // change "cell" to your cell's reuse identifier
       let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)

       cell.textLabel?.text = dataHolder[indexPath.row]

       return cell
   }

   // Here we're transfering the data we want to our DestinationViewController
   override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

       if let destinationVC = segue.destination as? DestinationViewController{

           if let pressedIndexPath = tableView.indexPathForSelectedRow{

               destinationVC.passedString = dataHolder[pressedIndexPath.row]
           }
       }
    }
}

另一方面:

class DestinationViewController: UIViewController {

      @IBOutlet weak var label: UILabel!

      var passedString: String!

       override func viewDidLoad() {
          super.viewDidLoad()

          label.text = passedString
       }
}

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