title: How to implement input textbox as mandatory field in IOS
body: <p>I am new to Iphone development. This will be the so simplest one to the experts. But I searched in google, I cannot find anything.</p>
  
  <p>I want to implement Input textbox as mandatory field by manually and programmatically. In android, it's easy to implement. But I don't know how to implement in IOS.</p>
  
  <p>Would you tell me how to do that ?</p>