title: How To Put UIPickerView Outside UIView when it's loaded
body: <p>I already have the code to animate UIPickerView to act like iOS keyboard, but the problem is when it's loaded for the first time, the UIPickerView is already shows up. I want to hide it first outside UIView area, until UIButton tapped. so it will animate just like iOS keyboard.</p>
  
  <p>here's the picture to illustrate what I mean : </p>
  
  <p><img src="https://i.stack.imgur.com/JnFC7.png" alt="enter image description here"></p>
  
  <p>how can it be done? thank you.</p>