按下检测删除键

Question

I'm writing a function that formats the entries on a UITextField to a date. It must be displayed like this dd/mm/yyyy. The problem is that I'm not being able to detect the delete key was pressed. I'm using UITextFieldDelegate method textField:shouldChangeCharactersInRange:replacementString: to detect when the user presses a key. Is there something like a \\n I may look for on the replacementString ?

Answer 1

当要删除字符时，替换字符串应为空字符串（ @"" ）。