小编Luc*_*cas的帖子

我正试图从带有C#的ListBox中获取所有选定的项目ValueMember.

例如:

我有这样一个列表:

ID | Name and Lastname
----------------------
1  | John Something
2  | Peter Something2
3  | Mary Smith

这个结构是我的ListBox的一部分.我用这段代码构建了这个列表框:

private void fill_people_listBox()
{
    this.listBoxPeople.DataSource = db.query("SELECT ....");
    this.listBoxPeople.DisplayMember = "people_name_last";
    this.listBoxPeople.ValueMember = "people_id"; 
}

ListBox已成功填充.当用户想要保存更改时,我将遍历此列表以获取所有选定的项目,但我不需要该项目,我需要ID.

例:

1 | John Something.

忽略John Something,得1,所以我不需要DisplayMember,只需要ValueMember.

为此,我尝试了以下几种方法:

1º

        foreach (ListBox selectedItem in this.listBoxGarantes.SelectedItems)
        {
            selectedItem.ToString(); // just an example, I'm printing this.

        }

2º

        string strItem;

        // insert garantes
        foreach (object selectedItem in this.listBoxGarantes.SelectedItems)
        {
            strItem = selectedItem as String;

            strItem; …

我正在尝试将Objective-C方法转换为Swift.

Objective-C方法如下:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showDetail"])
    {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        NSString *string = [feeds[indexPath.row] objectForKey: @"link"];

        string = [string stringByReplacingOccurrencesOfString:@"\n" withString:@" "];

        [[segue destinationViewController] setUrl:string];
    }
}

到目前为止我遇到的Swift方法(有问题)如下:

override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!)
{
    if (segue.identifier == "showDetail") {

        var indexPath:NSIndexPath = self.tableView.indexPathForSelectedRow()
        var string:NSString = self.feeds[indexPath.row] as String

        string = string.stringByReplacingOccurrencesOfString("\n", withString: "")

        segue.destinationViewController.setURL(string, forKey: nil)
    }
}

主要问题是最后一行:

segue.destinationViewController.setURL(string, forKey: nil)

我收到以下错误:

"无法将表达式的类型'Void'转换为'NSURL!'"

这是我试图调用的控制器:

import UIKit

class …