从 Xamarin.iOS 中的 TableView 单元格以编程方式推送 segue [英] Push a segue programatically from a TableView Cell in Xamarin.iOS

问题描述

我目前正在使用 Xamarin 开发一个相当简单的应用程序，但我遇到了一件事:我在 UIViewController 中创建了一个 tableView.单元格渲染在外部类中完成:TableSource.cs.UITableViewSource 的一个子类.要处理行单击我确实覆盖了选定的行:

i am developing a rather simple App with Xamarin at the moment, but i am stuck with one thing: I created a tableView within a UIViewController. The cell rendering is done in an external class: TableSource.cs. A Subclass of UITableViewSource. To handle the row Click i did override Row selected:

public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
    {
        new UIAlertView("Row Selected", tableItems[indexPath.Row], null, "OK", null).Show();
        tableView.DeselectRow (indexPath, true); // iOS convention is to remove the highlight
        //Push another ViewController on top:
        UINavigationController test = new UINavigationController ();
        test.PushViewController (new UIViewController (),true);

    }

到目前为止，它的作用就像魅力一样.但是当我尝试在顶部推送另一个 ViewController 以显示有关该行的详细数据时，什么也没有发生，我没有收到任何错误或异常消息.我还尝试使用用于导航的自定义类.控制器和视图控制器，它不会改变任何东西.

Works like charm so far. But when i try to push another ViewController on top, to display detailed data about the row, just nothing happens, i don't get any error or exception messages. I also tried it with custom classes for the Nav. Controller and the view Controller, it doesn't change anything.

推荐答案

你不能只是创建一个新的 UINavigationController 并像这样使用它.相反，您需要在创建 TVC 时将 UITableViewController 包装在 UINavigationController 中 - 然后在您的 RowSelected 中，您可以使用现有的 NavigationController 将新的 ViewController 推送到堆栈上.

You can't just create a new UINavigationController and use it like that. Instead, you need to wrap your UITableViewController in a UINavigationController when you create the TVC - then in your RowSelected you can use the existing NavigationController to push the new ViewController on the stack.

public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
    {
        new UIAlertView("Row Selected", tableItems[indexPath.Row], null, "OK", null).Show();
        tableView.DeselectRow (indexPath, true); // iOS convention is to remove the highlight

        // parent is a reference to the UITableViewController - you will need to pass this into
        // your TableSource class.  Every ViewController has a NavigationController property - if
        // the VC is contained in a Nav controller this property will be set.
        parent.NavigationController.PushViewController(new UIViewController(), true);

    }

在创建 TableSource 时，传入对 TableViewController 的引用，以便源的 RowSelected 方法可以访问 NavigationController.

When you create your TableSource, pass in a reference to the TableViewController so that your source's RowSelected method can access the NavigationController.

// in your TableViewController, when you assign the Source property
TableView.Source = new MyTableSource(this);

// in the MyTableSource class
TableViewController parent;

public MyTableSource(TableViewController parent) {
  this.parent = parent;
}

现在，在您的 RowSelected 方法中，您可以访问 parent.NavigationController

Now, in your RowSelected method, you can access parent.NavigationController

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