Add a prefix to UITextField

Question

I want a '$' Sign in the text field which cannot be erased. A user should be able to enter values after it and if he presses backspace it should only erase the value he entered.

The reason I can't use UILabel before it is because the text in UITextfield is center aligned and it grows to either side as the user enters values.

Please provide any solution.

Answer 1

1. Set the text field's text to "$" initially.
2. Set the text field's delegate to some object of yours (probably the view controller containing it).
3. Implement -textField:shouldChangeCharactersInRange:replacementString: and return NO if the proposed change would delete the "$".

Also, you might need to implement -textFieldDidBeginEditing: to position the cursor after the "$" if it's not there already.