title: Why UITextview does not have placeholder property like UITextField
body: <p>Hi I am working with iPhone apps, I know the UITextfield has placeholder property. But UITextview doesn't have placeholder property. I know the process how to customize placeholder for UITextview. But please let me know the difference.</p>
  
  <p>and UITextfield inherits from UIControl which inturns inherits from UIView...NSObject.
  and UITextview inherits from UIScrollView, UIView,UIresponder...NSOBject. But where is the difference frome place holder property. </p>
  
  <p>How textfield contains placeholder property, why textview doesn't contain placeholder? </p>
  
  <p>Please give any ideas, suggestions, and/or give better explanation.</p>