title: ViewController disable interaction - iOS
body: <p>I decided to collect data from users. And I started adding viewController on the top of mainViewController as also shown in the image below.
  My problem is that user could able to interact mainViewcontroller, which mapKit in my case.Whenever user scrolls picker view, it also affects mapViewController at the button! </p>
  
  <p>I dont want user to be able to interact with the mainViewController.</p>
  
  <p><img src="https://i.stack.imgur.com/AqyD2.png" alt="enter image description here"></p>