title: How to change font size throughout an iPhone app with a button
body: <p>I have an iPhone app with lots of UILabels throughout its screens. I am using Storyboards. My question is this. How can I change the font size in all of the labels in the app with a button or slider in the Settings screen? I would also like there to be a maximum size because otherwise the text will get too big for the screen.</p>
  
  <p>Thanks!</p>