Question

我有两个viewControllers.First一个是tableViewController，第二个是webViewController。我想使用segue将数据从第一个vc传递到第二个vc。出于这个原因，我想要覆盖func tableView（tableView：UITableView，didSelectRowAtIndexPath indexPath：NSIndexPath）中的“chosenCellIndex”值来准备ForSegue方法。但我无法从prepareForSegue方法访问selectedCellIndex值。请帮忙。

类NewsTableViewController：UITableViewController {

@IBOutlet var Alphacell: UITableView!

var chosenCellIndex = 0
//var temp = 0
var newspaper = ["A","B","C"]


override func viewDidLoad() {
    super.viewDidLoad()

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

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


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Alphacell", forIndexPath: indexPath) as UITableViewCell

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

   // Alphacell.tag = indexPath.row
    //Alphacell.addTarget(self, action: "buttonClicked:",forControlEvents: UIControlEvents.TouchUpInside)

    return cell
}

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

    chosenCellIndex = indexPath.row
    //println(chosenCellIndex)

    // Start segue with index of cell clicked
    //self.performSegueWithIdentifier("Alphacell", sender: self)

}


override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    let secondViewController = segue.destinationViewController as WebViewController
    secondViewController.receivedCellIndex = chosenCellIndex
    println(chosenCellIndex)
}

}

Answer 1

为了获得选择的单元索引，您需要获取所选行的索引路径，然后您需要从索引路径获取section或row索引。

请参阅以下代码获取行索引

    let indexPath = tableName.indexPathForSelectedRow
    let section = indexPath?.section
    let row = indexPath?.row

Answer 2

确保您已在故事板中的segue上设置标识符，然后执行：

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "someIdentifier"{
        let secondViewController = segue.destinationViewController as? WebViewController
//Also, make sure this is the name of the ViewController you are perfoming the segue to.
        secondViewController.receivedCellIndex = chosenCellIndex
        print(chosenCellIndex)
    }
    }

此外，您使用的是什么版本的Xcode和Swift？ println（）现在只是print（）。

Answer 3

最好的方法是从选择行功能，例如

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

        let objects = newspaper[indexPath.row]
        let vc = storyboard.instantiateViewControllerWithIdentifier("someViewController") as! UIViewController
        vc.someString = objects.title
        self.presentViewController(vc, animated: true, completion: nil)

}

和prepareForSegue使用此代码：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let path = self.tableView.indexPathForSelectedRow()!
    segue.destinationViewController.detail = self.detailForIndexPath(path)
}

如何从同一个类

3 个答案: