如何在整数或字符串的开头读取0？然后比较它们

I am trying to code a textField so that is someone put in the number 1 only it will show up 10 and if the put in the number 01 it will show up 01. The problem I have is that when I code an if statement it can't seem to read the 0 at the start of the number so I end up with 010 or just 1.I am trying to code a textField so that is some