title: How to get a grouped UITableViewCell content area width without using a constant
body: <p>I'm creating a table view controller for an iPad app. This view will potentially be displayed full-screen or within a modal view, so the size could be different each time it's displayed. I'd ideally like to make my code generic enough to work irrespective of the size it's displayed at. (As an academic exercise I'd also like the code to work on the iPhone too - but that's not really a requirement here.)</p>
  
  <p>I'm using a grouped table view style. I want to embed a UITextField into the cell's view. I can get the text field into the cell OK (using cell.AddSubview), but when I use the grouped style, the text field is at the very left of the table - not where it should be in the white area.</p>
  
  <p>I've looked around (e.g. at the UICatalog sample, and at the answers here) and all of the solutions to this problem seem to involve hard-coding a constant x offset for the border area. This x offset is around 35px on the iPad, but is around 20px on the iPhone.</p>
  
  <p>It seems to me that there should be a better way of doing this, but I've yet to find it. I've tried looking at the rectangles cell.Bounds, cell.Frame, cell.ContentView.Bounds, and cell.ContentView.Frame - none of them have the 'actual' content area of a grouped cell.</p>
  
  <p>Does anyone have another suggestion, or do I need to hard-code the value?</p>
  
  <p>Thanks</p>