title: How to set Custom size to Present Modally ViewController
body: <p>I have <code>ViewController</code> and when user clicks at a bottom of it then other <code>ViewController</code> pops-up using segue <code>Present Modally</code>. 
  Is it possible to give custom size to them ? I tried giving Content Size by <code>Use Preferred Explicit Size</code> option but it didn't help. I want that VC to pop up and take 70% of the current VC from up.</p>