在ios 11布局中找不到UITableViewCellDeleteConfirmationView在UITableviewcell中的子视图？

我必须覆盖Tableviewcell中的高度滑动删除按钮我使用了下面的代码它在ios 10中工作正常，但在ios11中我无法在layoutsubview类中找到UITableViewCellDeleteConfirmationView

 foreach (var views in this.Subviews)
    {
        if (views.Class.Name.ToString() == new NSString("UITableViewCellDeleteConfirmationView"))
        {
            CGRect newFrame = views.Frame;
            CGRect newframe1 = new CGRect(newFrame.X, 6, newFrame.Size.Width, 59);
            views.Frame = newframe1;

            foreach (var getButtonviews in views.Subviews)
            {
                Console.WriteLine("x:"+getButtonviews.Frame.X);
                Console.WriteLine("W:"+getButtonviews.Frame.Width);
                if (getButtonviews.Class.Name.ToString() == "_UITableViewCellActionButton")
                {
                    UIImage image = UIImage.FromBundle("img_line");
                    UIButton button = (UIButton)getButtonviews;
                    UIImageView imageview = new UIImageView();
                    imageview.Frame = new CGRect(getButtonviews.Frame.X + 120, 0, 1, getButtonviews.Frame.Height);
                    imageview.Image = image;
                    button.AddSubview(imageview);

                    foreach (var getButton in getButtonviews.Subviews)
                    {
                        if (getButton.Class.Name.ToString() == "UIButtonLabel")
                        {
                            UILabel label = (UILabel)getButton;
                            label.Font = UIFont.FromName("ProximaNova-Regular", 13);
                        }
                    }
                }
            }
        }

    }

---

在iOS10之后，tableview中的视图层次结构已更改

iOS8-iOS10

UITableView->UITableViewCell->UITableViewCellDelete确认视图->UITableViewCellActionButton

iOS11

使用Xcode8

UITableView->UITableViewWrapperView->UISwipeActionPullView->UISwipeActionStandardButton

使用Xcode9

UITableView->UISwipeActionPullView->UISwipeActionStandardButton

解决方案： 我让代码在iOS8-iOS11中都能工作，并且我将所有代码都放在ViewController中的ViewWillLayoutSubviews中，但是首先，我们需要知道我们正在选择哪个单元格

public class TableDelegate : UITableViewDelegate
{
    YourViewController owner;

    public TableDelegate(YourViewController vc){
        owner = vc;
    }

    public override UITableViewRowAction[] EditActionsForRow(UITableView tableView, NSIndexPath indexPath)
    {
        UITableViewRowAction hiButton = UITableViewRowAction.Create(
            UITableViewRowActionStyle.Default,
            "Hi",
            delegate {
                Console.WriteLine("Hello World!");
            });
        return new UITableViewRowAction[] { hiButton };
    }

    public override void WillBeginEditing(UITableView tableView, NSIndexPath indexPath)
    {
        owner.selectIndexPath = indexPath;
        owner.View.SetNeedsLayout();
    }

    public override void DidEndEditing(UITableView tableView, NSIndexPath indexPath)
    {
        owner.selectIndexPath = null;
    }
}

public class TableSource : UITableViewSource
{

    string[] TableItems;
    string CellIdentifier = "TableCell";

    public TableSource(string[] items)
    {
        TableItems = items;
    }

    public override nint RowsInSection(UITableView tableview, nint section)
    {
        return TableItems.Length;
    }

    public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPath)
    {
        UITableViewCell cell = tableView.DequeueReusableCell(CellIdentifier);
        string item = TableItems[indexPath.Row];

        //---- if there are no cells to reuse, create a new one
        if (cell == null)
        { cell = new UITableViewCell(UITableViewCellStyle.Default, CellIdentifier); }

        cell.TextLabel.Text = item;

        return cell;
    }
}

public partial class ViewController : UIViewController
{
    protected ViewController(IntPtr handle) : base(handle)
    {
        // Note: this .ctor should not contain any initialization logic.
    }

    public NSIndexPath selectIndexPath { get; set; }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();
        // Perform any additional setup after loading the view, typically from a nib.
        string[] tableItems = new string[] { "Vegetables", "Fruits", "Flower Buds", "Legumes", "Bulbs", "Tubers" };
        tableview.Source = new TableSource(tableItems);
        tableview.Delegate = new TableDelegate(this);
    }

    public override void ViewWillLayoutSubviews()
    {
        base.ViewWillLayoutSubviews();

        if (this.selectIndexPath != null)
        {
            if (UIDevice.CurrentDevice.CheckSystemVersion(11, 0))
            {
                // Code that uses features from iOS 11.0 and later
                foreach (UIView subview in tableview.Subviews)
                {
                    if (subview.Class.Name.ToString() == "UISwipeActionPullView")
                    {
                        foreach (var buttonViews in subview.Subviews)
                        {
                            if (buttonViews.Class.Name.ToString() == "UISwipeActionStandardButton")
                            {
                                //operate what you want.
                            }
                        }
                    }
                }
            }
            else
            {
                // Code to support earlier iOS versions
                UITableViewCell cell = tableview.CellAt(this.selectIndexPath);
                foreach (UIView subview in cell.Subviews)
                {
                    if (subview.Class.Name.ToString() == "UITableViewCellDeleteConfirmationView")
                    {
                        foreach (var buttonViews in subview.Subviews)
                        {
                            if (buttonViews.Class.Name.ToString() == "_UITableViewCellActionButton")
                            {
                                //operate what you want.
                            }
                        }
                    }
                }
            }
        }
    }
}

---

你找到解决方案了吗？使用下面的链接你可以得到答案。我如何从uitableview中获取UISweepActionPullView->UISweepActionStandardButton？你能给我一些示例代码吗？这对我有帮助lot@Kamalkumar.E我已经附上了全部代码，请检查一下。如果您还有任何问题，请随时告诉我。@ColeXia MSFT，在我的例子中，如果我使用ios11和xcode9构建，单元格甚至不可见。有什么想法吗？我只怀疑包装器视图周围有什么东西，但无法捕捉到它。看看你能不能帮忙。Thanks@torap您是使用ios还是xamarin.ios进行开发？您能打开一个新的线程来描述您的问题吗？在child中所有者（TableDelegate）的最佳用法必须是WeakReference，以避免引起强引用。像这样,<代码>WeakReference所有者