How to pass selected row string in table view to another ViewController page? (Swift 2)

问题

I am running Xcode 7.3 and using Swift 2.2. I am having trouble passing data from my first view controller to the second view controller. I've created a variable string in my first view controller that holds the selected row in the tableview and it works. I have also created another variable string in my second view controller that should hold the name of the selected row, then pass the text to a label.

import UIKit
import Parse
import ParseUI

class FruitListPage: UIViewController, UITableViewDelegate, UITableViewDataSource {


var selectedFruit = String()

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    let fruitName:Scanner2 = self.storyboard?.instantiateViewControllerWithIdentifier("scanPage") as! Scanner2
    fruitName.loadView()
    let nameShop = textArray[indexPath.row]
    print(nameShop)
    selectedFruit = nameShop

    print(selectedFruit)

    fruitName.selectedFruit2 = selectedFruit

}

Everything works completely fine unit here in the first view controller and I can see the fruit name every time I press a row in the tableview. The real problem is that selectedFruit2 string in the second view controller never grabs the data from the first view controller. Any clue?

import UIKit
import Parse

class Scanner2: UIViewController {

@IBOutlet var fruitNameLabel: UILabel!

var selectedFruit2 = String()

override func viewDidLoad() {
    super.viewDidLoad()

    print(selectedFruit2)

}

}

回答1:

Connect your viewController in storyBoard with a segue and set its identifier as "scanPageSegue" for instance... then:

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    performSegueWithIdentifier("scanPageSegue", sender: textArray[indexPath.row])
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "scanPageSegue" {
        if let fruitName = segue.destinationViewController as? Scanner2, 
           selectedFruit = sender as? String {
            fruitName.selectedFruit2 = selectedFruit
        }
    }
}

回答2:

You could try making a global variable and in the override func prepareForSegue method, initialize it with tableView.indexPathForSelectedRow!.row. This is how I did it and it worked fine.

回答3:

Try with this, in your tableView:didSelectedRowAtIndexPath:

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let fruitName:Scanner2 = self.storyboard?.instantiateViewControllerWithIdentifier("scanPage") as! Scanner2
    selectedFruit = textArray[indexPath.row]
    fruitName.selectedFruit2 = selectedFruit
    self.presentViewController(fruitName,animated:true,completion:nil)
}

回答4:

You could try this:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if let indexPath = self.tableView.indexPathForSelectedRow {
let destinationVC = segue.destinationController
destinationVC.string = textArray[indexPath] //this is the string in second view controller
}
}

来源：https://stackoverflow.com/questions/36252995/how-to-pass-selected-row-string-in-table-view-to-another-viewcontroller-page-s

标签

ios

storyboard

swift2