title: Expressing an NSNumber as a fraction in a UITextField
body: <p>I am working on a matrix calculator which will put an mxn matrix into row echelon form. To present the matrix to the user I have set up an mxn grid of UITextFields. Everything works fine but the only issue is that i would like to be able to display some of the elements, which are NSNumbers, as fractions instead of decimals. What would be the best way to do this?</p>