单击表格视图中的按钮时，如何更改表格视图之外的标签文本

Question

The problem is i have a tableview with custom cells. Inside the cell, i have a button. When the button is click, it should change the label text that is outside the tableview.

Edit: the label's text that I'm trying to change is on a different view. The ViewController has a tableview and a label view. Inside the tableview is a button and when it is click it changes the label's view text.

CustomCell and TableSource:

namespace Testing.iOS
{
    public partial class CustomCell : UITableViewCell
    {

        // Code omitted

        public class TableSource : UITableViewSource
        {  
            ViewController vc = new ViewController();

            public override UITableViewCell GetCell (UITableView tableView, NSIndexPath indexPath)
            {
                var cell = tableView.DequeueReusableCell (CustomCell.Key) as CustomCell;

                if (cell == null) 
                {
                    cell = new CustomCell ();
                    var views = NSBundle.MainBundle.LoadNib("CustomCell", cell, null);
                    cell = Runtime.GetNSObject( views.ValueAt(0) ) as CustomCell;
                }

                cell.btn.TouchUpInside += (object sender, EventArgs e) => 
                {     
                    // Change label that is outside tableview
                    vc.updateLabel();
                };

                // Code omitted

                return cell;
            }
        }
    }
}

View Controller:

namespace Testing.iOS
{
    public partial class ViewController : UIViewController
    {    
        public ViewController () : base ("ViewController", null)
        {
        }

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

            tableView.RegisterNibForCellReuse (CustomCell.Nib, "CustomCell");
            tableView.Source = new CustomCell.TableSource();
        }

        public override void DidReceiveMemoryWarning ()
        {
            base.DidReceiveMemoryWarning ();
        }

        public void updateLabel()
        {
            label.Text = "testing";
        }
    }
}

Answer 1

Use protocols and delegates. First write a CustomCellDelegate protocol in CustomCell class with method updateLabel() also pass the self as one of the argument.

-(void)updateLabelForCell:(UITabelViewCell *)cell;

and in the updateLabel() method, call the delegate method

[self updateLabelForCell:self];

then in the ViewController class, implement the delegate method. based on the function called update the label. set your ViewController as delegate for the tableviewcell.

Answer 2

In cellForRowAtIndexPath method add following code

[CustomCell.buttonOutlet addTarget:self action:@selector(BtnClicked:) forControlEvents:UIControlEventTouchUpInside];

Then handle your logic in BtnClicked method.

-(void)BtnClicked:(UIButton *)sender{

       labelOutlet.text = @"new text";

}