ios - 在 swift xcode 中通过 View 发送数据

Question

我正在尝试通过 View Controller 发送数据。

如果我点击一个单元格，我就会有一个转场将我转移到另一个 View Controller 。我有一个标签，我想根据单击的单元格中的文本进行更改。

这是我目前的代码:

import UIKit

FirstViewController 类:UIViewController{

var 存储字符串 = String()

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{
    tableView.deselectRowAtIndexPath(indexPath, animated: true)

    var venue : VenueItems

    if (tableView == self.searchDisplayController?.searchResultsTableView)
    {
        venue = self.filteredVenues[indexPath.row]
        var name = venue.name
        storedStadiumSelected = name
    }
    else
    {
        venue = self.venuesArray[indexPath.row]
        var name = venue.name
        storedStadiumSelected = name
    }


    println(storedStadiumSelected)

}

这里的代码...

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

    var nextViewController: SelectBookingTypeViewController = segue.destinationViewController as SelectBookingTypeViewController

    nextViewController.recievedStadiumSelected = storedStadiumSelected

}

我的第二个 View Controller 如下所示:导入 UIKit

类 SelectBookingTypeViewController:UIViewController {

@IBOutlet weak var stadiumLabel: UILabel!

var recievedStadiumSelected = String()


override func viewWillAppear(animated: Bool) {
    stadiumLabel.text = recievedStadiumSelected
}

这段代码的问题是我只加载了我之前单击的选项。例如，如果我单击“item1”，则标签文本什么都没有。但如果我返回并单击“item2”，标签现在是 item1。我不知道为什么会发生这种情况!

我对编码比较陌生，所以请原谅，谢谢您，我们将热情地接受任何帮助:)

Answer 1

最好的查找位置是 Apple 提供的 Master-Detail Application 的 Xcode 模板。这是您要查找的 DetailViewController 上的代码。

详细 View Controller

import UIKit

class DetailViewController: UIViewController {

@IBOutlet weak var detailDescriptionLabel: UILabel!


var detailItem: AnyObject? {
    didSet {
        // Update the view.
        self.configureView()
    }
}

func configureView() {
    // Update the user interface for the detail item.
    if let detail: AnyObject = self.detailItem {
        if let label = self.detailDescriptionLabel {
            label.text = detail.description

        }
    }
}

主视图 Controller

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showDetail" {
        if let indexPath = self.tableView.indexPathForSelectedRow() {
            let object = objects[indexPath.row] as! NSDate
            let controller = (segue.destinationViewController as! UINavigationController).topViewController as! DetailViewController
            controller.detailItem = object
            controller.navigationItem.leftBarButtonItem = self.splitViewController?.displayModeButtonItem()
            controller.navigationItem.leftItemsSupplementBackButton = true
        }
    }
}

表格 View 代码

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

    let object = objects[indexPath.row] as! NSDate

    //This Code here tells the label to update for the cell selected.
    cell.textLabel!.text = object.description 

    return cell
}

所以你在第二个ViewController中需要这个

func configureView() {
    // Update the user interface for the detail item.
    if let detail: AnyObject = self.detailItem {
        if let label = self.detailDescriptionLabel {

            //Change the label name to match yours.
            yourLabelName.text = detail.description
        }
    }
}