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 entere

Answer 1

As noted in the previous answer Add a prefix to UITextField

inside the textFieldDidBeginEditing as delegate method i found using the following code to be best and right way to format string we are pre/post fixing currency symbols/codes

        NSNumberFormatter* formatter = [[NSNumberFormatter alloc]init];
        [formatter setNumberStyle:NSNumberFormatterCurrencyStyle];
        [formatter setPaddingPosition:NSNumberFormatterPadAfterPrefix];
        [formatter setCurrencySymbol:symbol];
        [formatter setMaximumFractionDigits:2];
        [formatter setMinimumFractionDigits:2];
        [formatter setUsesGroupingSeparator:YES];
        [formatter setCurrencyGroupingSeparator:@","];
        [formatter setCurrencyDecimalSeparator:@"."];