Selecting all text in a UITextView on focus only after UIAlertView - ios

Question

I have a tableView that contains a few UITextView controls. When the user taps on one of these the text inside should be selected so that any keyboard input immediately replaces the original content.
I cannot get the text inside a UITextView selected using this code:
txtQuantity.SelectAll (new NSObject(NSObjectFlag.Empty));
as this code only shows the menu "Select | Select All' without the text being actually selected.
Has someone gotten this to work?
EDIT:
The code below select the text inside the txtQuantity control, BUT ONLY IF the UIAlert is show first! Why is this?
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
txtQuantity.TouchDown += txtQuantityHandleTouchDown;
txtQuantity.EditingDidBegin += delegate {
txtQuantity.ExclusiveTouch=true;
UIAlertView uv = new UIAlertView("","OK",null,"OK",null);
uv.Show ();
};
}
void txtQuantityHandleTouchDown (object sender, EventArgs e)
{
txtQuantity.SelectAll (this);
txtQuantity.Selected = true;
}
If all code within the txtQuality.EditingBegin delegate is commented out, the HandleTouchDown event does not fire.

Answer 1

I am not sure that this is what you are going for but I put together a quick sample.
The problem I was having is with calling SelectAll in EditingDidBegin. I had to make a call to BeginInvokeOnMainThread to get the select to work. I am not sure if it is a problem with the event not happening on the main thread or you simply need to make an async call on the main thread.
using System;
using System.Collections.Generic;
using System.Linq;
using MonoTouch.Foundation;
using MonoTouch.UIKit;
namespace SelectText
{
[Register ("AppDelegate")]
public partial class AppDelegate : UIApplicationDelegate
{
// class-level declarations
UIWindow window;
public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
// create a new window instance based on the screen size
window = new UIWindow (UIScreen.MainScreen.Bounds);
window.RootViewController = new MyTableViewController ();
// make the window visible
window.MakeKeyAndVisible ();
return true;
}
}
public class MyTableViewController : UITableViewController
{
public override void LoadView ()
{
base.LoadView ();
this.TableView.DataSource = new TableViewDataSource ();
}
private class TableViewDataSource : UITableViewDataSource
{
private class EditCell : UITableViewCell
{
UITextField _field;
public EditCell () : base (UITableViewCellStyle.Default, "mycell")
{
_field = new UITextField (this.Bounds);
_field.AutoresizingMask = UIViewAutoresizing.All;
_field.BackgroundColor = UIColor.Clear;
_field.ShouldReturn = delegate {
_field.ResignFirstResponder ();
return true;
};
_field.EditingDidBegin += delegate {
this.BeginInvokeOnMainThread ( delegate {
_field.SelectAll (this);
});
};
_field.Text = "Some Text";
this.Add (_field);
}
public override void LayoutSubviews ()
{
base.LayoutSubviews ();
_field.Frame = this.Bounds;
}
}
#region implemented abstract members of UITableViewDataSource
public override int RowsInSection (UITableView tableView, int section)
{
return 2;
}
public override UITableViewCell GetCell (UITableView tableView, NSIndexPath indexPath)
{
UITableViewCell cell = tableView.DequeueReusableCell ("mycell");
if (cell == null)
{
cell = new EditCell ();
}
cell.SelectionStyle = UITableViewCellSelectionStyle.None;
return cell;
}
#endregion
}
}
}