[IPhone] UITextView를 UITextField의 placeholder 처럼 사용하기

- (void)viewDidLoad{   
      commentTxtView.text = @"Comment";
      commentTxtView.textColor = [UIColor lightGrayColor];
}

- (BOOL) textViewShouldBeginEditing:(UITextView *)textView
{

     if(commentTxtView.text.length > 0 && commentTxtView.textColor == [UIColor blackColor])

    	 return YES;

 

     commentTxtView.text = @"";
     commentTxtView.textColor = [UIColor blackColor];
     return YES;
}


-(void) textViewDidChange:(UITextView *)textView
{
if(commentTxtView.text.length == 0){
    commentTxtView.textColor = [UIColor lightGrayColor];
    commentTxtView.text = @"Comment";
    [commentTxtView resignFirstResponder];
}

}