Not able find UITableViewCellDeleteConfirmationView in ios 11 layoutsubview subview in UITableviewcell?

Question

I have to override the height swipe delete button in Tableviewcell i used the below code it\'s work fine ios 10 but in ios11 i can\'t able find the UITableViewCellDeleteConf

Answer 1

The view hierarchy inside tableview has been changed after iOS10.

iOS8 - iOS10

UITableView -> UITableViewCell -> UITableViewCellDeleteConfirmationView -> _UITableViewCellActionButton

iOS11

1. work with Xcode8

   UITableView -> UITableViewWrapperView -> UISwipeActionPullView -> UISwipeActionStandardButton

2. work with Xcode9

   UITableView -> UISwipeActionPullView -> UISwipeActionStandardButton

Solution:

I make the code work both at iOS8 - iOS11, and I put all the code at ViewWillLayoutSubviews in ViewController , but first , we need to know which cell we are selecting.

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.
                            }
                        }
                    }
                }
            }
        }
    }
}