UITableViewCell content moving around

Question

I have an iPhone app in which I'm using a UITableView to format a set of text responses, one per row. I've set up the cell in the storyboard to have a label inside it, and set up a constraint saying that the label should be 10 points from the edge of the cell. I then set up a custom subclass of UITableViewCell, set the cell in the storyboard to be of that class, and connected the outlet.

However, when I load the table, I see the text in the cell moving slightly to the right under some circumstances: when I select the cell, or when I load additional cells into the table. In fact, in the latter case, sometimes everything gets shifted to the right, even cells which were already there!

What the heck is going on here? The only changes I'm making in tableView:cellForRowAtIndexPath: are to the text in the label, and I'm always setting it. And I've unset "Indent While Editing" on the cell in the storyboard.

Answering some of the questions: I'm setting the view up using the storyboard. Xcode isn't reporting any ambiguity with the constraints. Also, here are the screenshots, before and after:

Answer 1

My guess is that the constraints for the label are ambiguous. Ambiguity can make UI components jump around for inexplicable reasons. You probably need to set more constraints for the label to define its position on both axes.

Or, maybe all you need to do is set the label to the "size that fits content" (intrinsic content size) under the Editor menu in IB.