Enable keyboard return key

I would like to enable the keyboard return key only when some uitextfields are not empty. I read this question How to disable/enab开发者_运维百科le the return key in a UITextField?

Is this the only way? Is it true this could cause Apple to reject the app?

Following thing will enable/disable return key automatically.

• (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {

   textfield.enablesReturnKeyAutomatically = YES;
  
  // your code here
  
    return YES;  }
  

This is not a public API, so use it on your own risk.

textField.setValue(true/false, forKeyPath: "inputDelegate.returnKeyEnabled")

More detailed answer here.

You can use the textFieldShouldReturn: method to prevent the return key from returning.

http://developer.apple.com/library/ios/#documentation/uikit/reference/UITextFieldDelegate_Protocol/UITextFieldDelegate/UITextFieldDelegate.html