title: how to scale / increase font size for iphone 4 , 5 and 6 using autolayout
body: <p>I am trying to use different font size for iphone  5 , 6 and ipad using autolayout. I tried this setting like below screen shot but the fonts size is not giving the required results :
  <img src="https://i.stack.imgur.com/hgicK.png" alt="enter image description here"></p>