iOS string format

[webznz]

Hey, I'm not sure how to refer to this.. I think its a string format but thought I would come here to get some help.

I am wanting to get my user to enter a 20 character string, they will be numbers and I want to after every fifth number to insert a hyphen.. as the person is typing... how can this be done?

thanks.

 

[jnoxx]

this would take a bit of work i think, but u should use the delegate method of a textField, didchangecharactersinrange or somewhat?
Think that should set u off..