iPhone: how to change label font-size by autosizing it for iPad app?

I want to convert an iPhone app into an iPad app

For that I am autosizing the controls, for button it works fine.

Problem comes when I am Autosizimg the label the position of label changes relatively but the font size of label remains same.

How to increase the label size (i.e. font size of label) by Autosizing label ?

Please Help & Suggest

Thanks.

Solution

I have dynamically added the check for whether the device is iPhone or iPad and set the font size of label text according to the current device

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) //Code for iPad else //Code for iPhone or iPod